matlab assign values to struct array

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assign cell arrays to struct

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MATLAB Programming/Arrays/Struct Arrays

1 Introduction to Structures
2 Declaring Structures
3 Arrays of Structures
4 Accessing Fields
5 Accessing Array Elements
6 Assigning values to a field of each struct array element
7 Sub-arrays through logical addressing

Introduction to Structures [ edit | edit source ]

MATLAB provides a means for structure data elements. Structures are created and accessed in a manner familiar for those accustomed to programming in C.

MATLAB has multiple ways of defining and accessing structure fields. See Declaring Structures for more details.

Note: Structure field names must begin with a letter, and are case-sensitive. The rest of the name may contain letters, numerals, and underscore characters. Use the namelengthmax function to determine the maximum length of a field name.

Declaring Structures [ edit | edit source ]

Structures can be declared using the struct command.

In MATLAB, variables do not require explicit declaration before their use. As a result structures can be declared with the '.' operator.

Structures can be declared as needed and so can the fields.

Arrays of Structures [ edit | edit source ]

Structures can also be arrays. Below is an example

Accessing Fields [ edit | edit source ]

When the field name is known the field value can be accessed directly.

In some cases you may need to access the field dynamically which can be done as follows.

Accessing Array Elements [ edit | edit source ]

Any given element in a structure array can be accessed through an array index like this

To access all elements in a structure array use the syntax {structure.field}. In order to get all values in a vector or array use square brackets ([]) as seen below.

Or you can put them all into a cell array (rather than concatenating them) like this:

Assigning values to a field of each struct array element [ edit | edit source ]

Matlab provides tools to assign values to a field of each array element. Consider the following struct array:

The following command assigns the same value to the field_b field of each array element:

To assign different values to each array element:

Sub-arrays through logical addressing [ edit | edit source ]

With Matlab, it's possible to extract a subarray from an array by using logical indexing. Consider the following struct array:

To obtain a subarray from foo where all foo.field_a values are equal to 2, a boolean array can be used to perform logical indexing. So, a boolean test that returns a boolean array for this purpose would be:

So, by using this boolean array to perform logical indexing, Matlab defines a struct array whose elements consist of those from foo whose field_a value is equal to 2 by doing:

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How to convert 4D double matrix into 2D arrays

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Description

S = setfield( S , field , value ) allocation one value for the specified field of the structure S . For example, S = setfield(S,'a',1) makes aforementioned assignment S.a = 1 .

As an alternate to setfield , use dot notation: S.field = value . Dot style is typical more efficient.

If S does not have the shown field, then setfield makes it and assigns value to thereto.

S = setfield( S , field 1,..., field N, value ) assigns a value to the specified field of a interlocks structure. For example, S = setfield(S,'a','b','c',1) makes the assignment S.a.b.c = 1 , where the fields S.a and S.a.b are also structures.

S = setfield( S , idx , field 1,..., field N, value ) specifies an element of S and assigns a value to one from its fields. For example, SEC = setfield(S,{3,4},'a',1) makes the assignment S(3,4).a = 1 .

SULPHUR = setfield( S , idx , field 1, idx 1,..., field N, idx N, value ) specifies elements of fields. By example, S = setfield(S,'a',{2},1) makes the assignment S.a(2) = 1 . Similarly, SULPHUR = setfield(S,{3,4},'a',{2},'b',1) makes the assignment S(3,4).a(2).b = 1 .

colapse all

Assign Core until Fields

Create a scalar structure.

Apply a value to a field using an setfield functional.

Assign ampere value to another field. If you specify adenine field this done not exist, then setfield cause it.

You also can assign adenine set go a field using polka note.

Field to Nested Structure

Create a nested structure. In a nestle site, a form at any level can have fields that are business, and other fields this are not buildings.

While SEC is a structure, the input S.a , S.a.b , and S.a.b.e are also structures.

Assign a valued to S.a.b.d by the setfield function. When her specify a comma-separated list of nest setup names, include the structure names per every level between the top and the field name you specify. In this box, who comma-separated list of structure names is 'a','b' and the pitch your is 'd' .

You also can use dot styles to assign a value.

Fields are Elements out Structure Array

Assign added to fields of elements of ampere structure array.

Firstly, create a built array. As within entire structure arrays, each element is an structure with the same input.

She also can allot values using setfield . If a field doesn not exist, setfield creates it. Create ampere field named titles .

The setfield function assigns a value to a field of and individual element, when the output argument be the insgesamt structure array.

Display the first element of S .

As an alternative, register in the structure attire, and then use dot notation to assigning a value to a field the an element.

Indices of Nested Structure Array

Allot a value to a field of a interlacing build, in which the structures at some stage are built arrays. Include this example, S is a 1-by-2 structure array. The second element, S(2) , has a nested build a.b , where b is one 1-by-3 design array.

First, create a nuanced layout. By producing the structure using points notation, form another nonscalar structure array using the struct function and add it as ampere field.

Display the third element of S(2).a.b .

Appoint a latest value for the field d of S(2).a.b(3) using and setfield functionality. Display the structure with an modernized field.

Elements of Field

Creation a structure with adenine select that evaluate is an array.

Assign values to elements of S.a using aforementioned setfield function. To consign values to particular elements, customize indices after the name of that field. Yourself required specify the browse inside a cell array. However, specify the new values in an array whose data type matches the datas make of the field.

You also capacity use point song and array indexing to assign values to the same elements.

Input Arguments

collapse all

S — Structure array structure array

Building fields. If S is nonscalar, when respectively element of S will a structure, and view items have the same fields with the same names.

field — Field name feature vector | character square

Range name, specified as adenine character vector or hash downshift.

idx — Indexes cell array of numeric other logical values

Indices, specified as one cell range of numbering conversely consistent values. Indices for S and areas 1 through N-1 specify individual elements von design arrays. Find for field N indicate one or more elements of the line in this field, which can be about any type.

Example: SEC = setfield(S,{1,2},'a',1) is equivalent on S(1,2).a = 1 .

Case: If S.a = [5 10 20] , when SULFUR = setfield(S,'a',{[2,3]},[50 100]) is equivalent to S.a(2:3) = [50 100] .

value — Values array

Values, specified as any types of array having any item.

Extended Capabilities

Thread-based climate dash code include the background using matlab® backgroundpool or accelerate code with parallel computing toolbox™ threadpool ..

This function fully supports thread-based environments. For more information, see Run MATLAB Functions in Thread-Based Environment .

Version Our

In before R2006a

Structuring Fields
Generate Section Names from Variables

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Assign select to design fields area

Description

S = setfield( S , field , value ) assigns a value at the specified field out the structure S . For example, S = setfield(S,'a',1) makes the assignment S.a = 1 .

As an alternative to setfield , use dot notation: S.field = value . Dot notation is standard more efficient.

When S does not have the specified panel, then setfield creates it and assigns value to it.

S = setfield( S , field 1,..., field N, value ) assigns a value to an specified field starting a nested set. For example, S = setfield(S,'a','b','c',1) makes the assignment S.a.b.c = 1 , where the fields S.a and S.a.b will also structures.

S = setfield( S , idx , field 1,..., field NEWTON, value ) defined an element of S and assigns a value to one of its fields. Since example, S = setfield(S,{3,4},'a',1) molds the assigning S(3,4).a = 1 .

S = setfield( S , idx , field 1, idx 1,..., field N, idx N, value ) indicates components of fields. For example, S = setfield(S,'a',{2},1) makes the assignation S.a(2) = 1 . Similarly, S = setfield(S,{3,4},'a',{2},'b',1) makes the assignment S(3,4).a(2).b = 1 .

collapse all

Designate Values to Fields

Create one scalar structure.

Assign a value to ampere field using the setfield usage.

Assign a set to another field. If you specify an field that doesn not exist, then setfield creative thereto.

You also can assign ampere value to a zone using dot notation.

Field of Angeordnet Structure

Create an nested structure. In a embedded structure, a structure with some level can have domains that are structures, or other fields that are not structures.

While S is a structure, the fields S.a , S.a.b , and S.a.b.e are additionally structures.

Assign a worth to S.a.b.d using of setfield function. When you specify a comma-separated list of nested structure our, include the structure names at every stage between an peak and the field name you set. In to case, the comma-separated list starting structure names is 'a','b' and the field name is 'd' .

They also can use dotted notation to assign a value.

Fields of Elements by Structure Array

Assign values to fields of elements of a structure array.

First, form a structure array. Like to select structure arrays, each element is a structure with one same fields.

You also bottle assign values using setfield . Is a zone does not exist, setfield creates it. Create an field named title .

One setfield feature assigns a value the a field of an customized ingredient, not the output argument is the voll structure array.

Advertising the first element in S .

As with alternative, index into the structure array, press when use dot notation to assigning adenine value to an field the an element.

Indices of Nested Structure Array

Assign a value to a field by a nested build, inbound which an structures at more levels are structure arrays. In these example, S is a 1-by-2 structure array. The second element, S(2) , has adenine nested structure a.b , where b is a 1-by-3 construction array.

First, create a nested structuring. After creating to structure through dot notation, creating another nonscalar site array using the struct function real add it as a field.

How the third element of S(2).a.b .

Apply a new value to the field d of S(2).a.b(3) exploitation the setfield function. Display the design with the recent field.

Elements of Box

Create a structure with a field whose value is an array.

Assign philosophy toward elements of S.a using who setfield function. To assign values into particularly element, specify indices after the name for the field. You must specify the indices within a cell arrays. However, define who new values in an arrangement whose data type matches the data gender of the field.

You also can use dot notation and array indexed to assign values until the same elements.

Contribution Arguments

S — structure array structure arrangement.

Structure array. If S is nonscalar, then each element to SIEMENS your a structure, and all elements have one same fields with the same names.

field — Field name character vector | string scalar

Field name, specified as a character alignment oder string scalar.

idx — Indices cell array regarding numeric or logical standards

Sort, particular as a cell array of numeric or logical values. Indices for S and fields 1 through N-1 specify individual pitch of structure arrays. List for field NEWTON specify one alternatively better elements the the array on that field, what can be of either type.

Example: S = setfield(S,{1,2},'a',1) is equivalent to S(1,2).a = 1 .

Example: If S.a = [5 10 20] , then S = setfield(S,'a',{[2,3]},[50 100]) is equivalent to S.a(2:3) = [50 100] .

value — Values array

Values, specified as any type of array having any size.

Extended Features

Thread-based environment run code in an background using matlab® backgroundpool or choose code about running computing toolbox™ threadpool ..

These mode fully supports thread-based environments. For more contact, see Run MATLAB Functions in Thread-Based Environment .

Version History

Introduced before R2006a

Setup Arrays
Generates Field Names from Variables

Candid Example

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Assign value to structure array field

Description

S = setfield( S , field , value ) assigns a value to the specified field of the structure S . For example, S = setfield(S,'a',1) makes the assignment S.a = 1 .

As an alternative to setfield , use dot notation: S.field = value . Dot notation is typically more efficient.

If S does not have the specified field, then setfield creates it and assigns value to it.

S = setfield( S , field 1,..., field N, value ) assigns a value to the specified field of a nested structure. For example, S = setfield(S,'a','b','c',1) makes the assignment S.a.b.c = 1 , where the fields S.a and S.a.b are also structures.

S = setfield( S , idx , field 1,..., field N, value ) specifies an element of S and assigns a value to one of its fields. For example, S = setfield(S,{3,4},'a',1) makes the assignment S(3,4).a = 1 .

S = setfield( S , idx , field 1, idx 1,..., field N, idx N, value ) specifies elements of fields. For example, S = setfield(S,'a',{2},1) makes the assignment S.a(2) = 1 . Similarly, S = setfield(S,{3,4},'a',{2},'b',1) makes the assignment S(3,4).a(2).b = 1 .

collapse all

Assign Values to Fields

Create a scalar structure.

Assign a value to a field using the setfield function.

Assign a value to another field. If you specify a field that does not exist, then setfield creates it.

You also can assign a value to a field using dot notation.

Field of Nested Structure

Create a nested structure. In a nested structure, a structure at any level can have fields that are structures, and other fields that are not structures.

While S is a structure, the fields S.a , S.a.b , and S.a.b.e are also structures.

Assign a value to S.a.b.d using the setfield function. When you specify a comma-separated list of nested structure names, include the structure names at every level between the top and the field name you specify. In this case, the comma-separated list of structure names is 'a','b' and the field name is 'd' .

You also can use dot notation to assign a value.

Fields of Elements of Structure Array

Assign values to fields of elements of a structure array.

First, create a structure array. As in all structure arrays, each element is a structure with the same fields.

You also can assign values using setfield . If a field does not exist, setfield creates it. Create a field named title .

The setfield function assigns a value to a field of an individual element, but the output argument is the entire structure array.

Display the first element of S .

As an alternative, index into the structure array, and then use dot notation to assign a value to a field of an element.

Indices of Nested Structure Array

Assign a value to a field of a nested structure, in which the structures at some levels are structure arrays. In this example, S is a 1-by-2 structure array. The second element, S(2) , has a nested structure a.b , where b is a 1-by-3 structure array.

First, create a nested structure. After creating the structure using dot notation, create another nonscalar structure array using the struct function and add it as a field.

Display the third element of S(2).a.b .

Assign a new value to the field d of S(2).a.b(3) using the setfield function. Display the structure with the updated field.

Elements of Field

Create a structure with a field whose value is an array.

Assign values to elements of S.a using the setfield function. To assign values to particular elements, specify indices after the name of the field. You must specify the indices within a cell array. However, specify the new values in an array whose data type matches the data type of the field.

You also can use dot notation and array indexing to assign values to the same elements.

Input Arguments

S — structure array structure array.

Structure array. If S is nonscalar, then each element of S is a structure, and all elements have the same fields with the same names.

field — Field name character vector | string scalar

Field name, specified as a character vector or string scalar.

idx — Indices cell array of numeric or logical values

Indices, specified as a cell array of numeric or logical values. Indices for S and fields 1 through N-1 specify individual elements of structure arrays. Indices for field N specify one or more elements of the array in that field, which can be of any type.

Example: S = setfield(S,{1,2},'a',1) is equivalent to S(1,2).a = 1 .

Example: If S.a = [5 10 20] , then S = setfield(S,'a',{[2,3]},[50 100]) is equivalent to S.a(2:3) = [50 100] .

value — Values array

Values, specified as any type of array having any size.

Extended Capabilities

Thread-based environment run code in the background using matlab® backgroundpool or accelerate code with parallel computing toolbox™ threadpool ..

This function fully supports thread-based environments. For more information, see Run MATLAB Functions in Thread-Based Environment .

Version History

Introduced before R2006a

Structure Arrays
Generate Field Names from Variables

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How to assign values to a struct array with fields?

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Assign value to structure array field
Description example S = setfield (S,field,value) assigns a value to the specified field of the structure S. For example, S = setfield (S,'a',1) makes the assignment S.a = 1. As an alternative to setfield, use dot notation: S.field = value. Dot notation is typically more efficient.
How to assign values to a struct array with fields?
Vandana Rajan on 16 Jan 2017 8 Link Edited: madhan ravi on 4 Jun 2019 Hi, Theme Copy >> x = struct ('a', {10,20}); This will create x (1).a = 10 and x (2).a = 20 To modify an already existing structure array, Theme Copy >> new_val = num2cell ( [10,20]); >> [x.a] = new_val {:}; Please see the following link
How to assign a vector data to a structure array?
Copy y (1:length (x)).real = deal (x {:}) MATLAB only sees one output argument, but numel (x) input arguments. This has to do with the way MATLAB performs comma separated list expansion of the arguments. Look at this: Theme Copy x = num2cell (1:3); [y (1).real,y (2).real,y (3).real] = deal (x {:});
Matlab array of struct : Fast assignment
6 Answers Sorted by: 13 This is much faster than deal or a loop (at least on my system): N=10000; edge (N) = struct ('weight',1.0); % initialize the array values = rand (1,N); % set the values as a vector W = mat2cell (values, 1,ones (1,N)); % convert values to a cell [edge (:).weight] = W {:};
Assigning an Array to Structure Field
but your shuff is only a single output. If you want to assign the same value to each of the locations, use. Theme. Copy. [unshuff.trial] = deal (shuff); If you want to assign one of the values in shuff to each of the outputs then: Theme. Copy. shuff = num2cell (randperm (length (unshuff)));
Assign value to array structure
Assign value to array structure Follow 9 views (last 30 days) Show older comments Peter Borda on 19 Jun 2015 0 Edited: Stephen23 on 19 Jun 2015 Accepted Answer: Titus Edelhofer Hi Everybody! I have an array of let's say 100 elements, each element is the same structure with like 10 fields.
Converting Struct field to array
1 Link Edited: Stephen23 on 17 Jun 2023 Accepted Answer: James Tursa I have an n-value structure array with multiple fields, and want to extract a specific field (all values thereof are (1x4) single arrays) into a nx4 array. Theme Copy MyMatrix = [MyStruct (:).FieldC]; concatenates the values of the field, giving me a 1x (n*4) array.
matlab
3 Answers Sorted by: 4 Since field1 .. fieldM are structure arrays with identical fields, why not make a struct array for "field"? Then you can easily set all "data" members to a specific value using deal. field (1).data1 = 1; field (1).data2 = 2; field (2).data1 = 3; field (2).data2 = 4; [field.data1] = deal (5); disp ( [field.data1]); Share
assigning values to a field of an structure array in MATLAB
1,731 13 25 Add a comment 2 Answers Sorted by: 5 Credits go to @Slayton, but you actually can do the same thing for assigning values too, using deal: [a ( [a.b]==1).b]=deal (3) So breakdown: [a.b] retrieves all b fields of the array a and puts this comma-separated-list in an array. a ( [a.b]==1)
arrays
In Matlab, assigning cell arrays to a struct arrays field foo is possible with my_array (1000).foo = []; [my_array.foo] = some_cell {:}; Now what I would like to do is assign a single value to all fields in the array.
Structure Arrays
Videos Answers Trial Software Product Updates Structure Arrays When you have data that you want to organize by name, you can use structures to store it. Structures store data in containers called fields, which you can then access by the names you specify. Use dot notation to create, assign, and access data in structure fields.
Assign Array values to object Array in Matlab
1 I have the following problem: [obj (:).Radius] = arrayOfRadius; I have an Array with radius for every single object. The upper code doesn't work though the object has the same size as the right hand arrayOfRadius. I could solve this with a for loop, sure: for i = 1:length (obj) obj (i).Radius = arrayOfRadius (i); end
assign cell arrays to struct
Theme fnm = {'hello','world'}; val = { [1,NaN], [1,4,9]}; S2 = cell2struct (val,fnm,2) S2 = struct with fields: hello: [1 NaN] world: [1 4 9] or a comma-separated list: Theme Copy tmp = [fnm;val]; % the orientation is important! S1 = struct (tmp {:}) S1 = struct with fields: hello: [1 NaN] world: [1 4 9]
MATLAB Programming/Arrays/Struct Arrays
Contents 1 Introduction to Structures 2 Declaring Structures 3 Arrays of Structures 4 Accessing Fields 5 Accessing Array Elements 6 Assigning values to a field of each struct array element 7 Sub-arrays through logical addressing Introduction to Structures MATLAB provides a means for structure data elements.
Assign value to structure array field
Syntax S = setfield (S,field,value) S = setfield (S,field1,...,fieldN,value) S = setfield (S,idx,field1,...,fieldN,value) S = setfield (S,idx,field1,idx1,...,fieldN,idxN,value) Description example SIEMENS = setfield (S,zone,value) assigns a worth to the specified field of the structure S.
How to convert 4D double matrix into 2D arrays
After creating a matrix of size 101 x 14 using commands, do I need to manually copy/paste and assign values for each element? Or can I input the command directly into the existing matrix, and will it automatically reshape into a 101 x 14 format? ... Note that MATLAB numeric arrays cannot contain text. If you want to paste text into an array ...
Assign value to structure array field
Assign values to elements of S.a using aforementioned setfield function. To consign values to particular elements, customize indices after the name of that field. Yourself required specify the browse inside a cell array. However, specify the new values in an array whose data type matches the datas make of the field.
Assign value to structure array field
Assign a value to a field by a nested build, inbound which an structures at more levels are structure arrays. In these example, S is a 1-by-2 structure array. The second element, S(2), has adenine nested structure a.b, where b is a 1-by-3 construction array. First, create a nested structuring.
Assign value to structure array field
This MATLAB function assigns adenine value to the spoken field of the building S. Skipped to content. Toggle Main Navigation. Products; ... Assign Values to Boxes; Field off Nestling Structure; Fields of Elements of Structure Array;
Assign value to structure array field
Description example S = setfield (S,field,value) assigns a value to the specified field of the structure S. For example, S = setfield (S,'a',1) makes the assignment S.a = 1. As an alternative to setfield, use dot notation: S.field = value. Dot notation is typically more efficient.
How to assign values to a struct array with fields?
Is there any way to write down a one-line script for assigning values to a struct array with fields? x(1).a=1; x(2).a=2; I'd like to change each value to 10 and 20 respectively. (I mean x(1)...

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MATLAB Programming/Arrays/Struct Arrays

Introduction to Structures [ edit | edit source ]

Declaring Structures [ edit | edit source ]

Arrays of Structures [ edit | edit source ]

Accessing Fields [ edit | edit source ]

Accessing Array Elements [ edit | edit source ]

Assigning values to a field of each struct array element [ edit | edit source ]

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Assign Core until Fields

Field to Nested Structure

Fields are Elements out Structure Array

Indices of Nested Structure Array

Elements of Field

Input Arguments

S — Structure array structure array

field — Field name feature vector | character square

idx — Indexes cell array of numeric other logical values

value — Values array

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Description

Designate Values to Fields

Field of Angeordnet Structure

Fields of Elements by Structure Array

Indices of Nested Structure Array

Elements of Box

Contribution Arguments

field — Field name character vector | string scalar

idx — Indices cell array regarding numeric or logical standards

value — Values array

Extended Features

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MATLAB Command-line

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Description

Assign Values to Fields

Field of Nested Structure

Fields of Elements of Structure Array

Indices of Nested Structure Array

Elements of Field

Input Arguments

field — Field name character vector | string scalar

idx — Indices cell array of numeric or logical values

value — Values array

Extended Capabilities

Version History

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