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Assigning value to an array
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Assigning values in a vector array to a column in an array
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- non_steady_state_thick_change.m
- thick_change_spatially_var.m
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- matrix array
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Multidimensional Arrays
A multidimensional array in MATLAB® is an array with more than two dimensions. In a matrix, the two dimensions are represented by rows and columns.
Each element is defined by two subscripts, the row index and the column index. Multidimensional arrays are an extension of 2-D matrices and use additional subscripts for indexing. A 3-D array, for example, uses three subscripts. The first two are just like a matrix, but the third dimension represents pages or sheets of elements.
Creating Multidimensional Arrays
You can create a multidimensional array by creating a 2-D matrix first, and then extending it. For example, first define a 3-by-3 matrix as the first page in a 3-D array.
Now add a second page. To do this, assign another 3-by-3 matrix to the index value 2 in the third dimension. The syntax A(:,:,2) uses a colon in the first and second dimensions to include all rows and all columns from the right-hand side of the assignment.
The cat function can be a useful tool for building multidimensional arrays. For example, create a new 3-D array B by concatenating A with a third page. The first argument indicates which dimension to concatenate along.
Another way to quickly expand a multidimensional array is by assigning a single element to an entire page. For example, add a fourth page to B that contains all zeros.
Accessing Elements
To access elements in a multidimensional array, use integer subscripts just as you would for vectors and matrices. For example, find the 1,2,2 element of A , which is in the first row, second column, and second page of A .
Use the index vector [1 3] in the second dimension to access only the first and last columns of each page of A .
To find the second and third rows of each page, use the colon operator to create your index vector.
Manipulating Arrays
Elements of multidimensional arrays can be moved around in many ways, similar to vectors and matrices. reshape , permute , and squeeze are useful functions for rearranging elements. Consider a 3-D array with two pages.
Reshaping a multidimensional array can be useful for performing certain operations or visualizing the data. Use the reshape function to rearrange the elements of the 3-D array into a 6-by-5 matrix.
reshape operates columnwise, creating the new matrix by taking consecutive elements down each column of A , starting with the first page then moving to the second page.
Permutations are used to rearrange the order of the dimensions of an array. Consider a 3-D array M .
Use the permute function to interchange row and column subscripts on each page by specifying the order of dimensions in the second argument. The original rows of M are now columns, and the columns are now rows.
Similarly, interchange row and page subscripts of M .
When working with multidimensional arrays, you might encounter one that has an unnecessary dimension of length 1. The squeeze function performs another type of manipulation that eliminates dimensions of length 1. For example, use the repmat function to create a 2-by-3-by-1-by-4 array whose elements are each 5, and whose third dimension has length 1.
Use the squeeze function to remove the third dimension, resulting in a 3-D array.
Related Topics
- Creating, Concatenating, and Expanding Matrices
- Array Indexing
- Reshaping and Rearranging Arrays
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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 .
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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
C/c++ code generation generate c and c++ code using matlab® coder™..
Usage notes and limitations:
Field name must be constant.
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
getfield | fieldnames | isfield | orderfields | rmfield | struct
- Structure Arrays
- Generate Field Names from Variables
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Accepted Answer: Azzi Abdelmalek. Hello, I want to assign value to an array. For example: A= [0 0 0 0 0 0 0 0 0 0 0 0]; Value to Assign: A (1 2 11 12)=30; After that, A= [30 30 0 0 0 0 0 0 0 0 0 0 30 30] Now, I wanna assign the value A (2 10 12)=20 to the same array. But, value of the new array will be the sum of previous if the index matches.
In general, you can use indexing to access elements of any array in MATLAB regardless of its data type or dimensions. For example, directly access a column of a datetime array. ... MATLAB matches the locations of the value 1 in ind to the corresponding elements of A and B, and lists their values in a column vector. Avals = A(ind)
Open in MATLAB Online. The thing we are trying to do is emulate the very useful Python idiom e.g. a,b,c,d = [1,2,3,4] In Matlab, if you create a function assignList.m as follows: Theme. Copy. function varargout = assignList ( inputArray ) for i = 1:length ( inputArray) varargout {i} = inputArray (i);
However, if they are packed in one variable, you can only deal them if they are in a cell or structure array - with deal(X{:}) for cell array and deal(S.field) for structure array. (In the latter case only one field is dealt, but from all structures in array.) With Matlab v.7+ you can use X{:} and S.field without deal, as noted in other answers.
To assign values in the MATLAB base workspace, use 'base'. The base workspace stores variables that you create at the MATLAB command prompt, including any variables that scripts create, assuming that you run the script from the command line or from the Editor. ... Value of variable, specified as a scalar or array value. val can have any data ...
For newer versions of MATLAB, that do implicit singleton expansion, you can do: B = A == max(A); Here we just find, for each column, the element that matches the maximum for that column, and set it to true (which has a value of 1). If your version of MATLAB does not support implicit singleton expansion, you can use bsxfun to accomplish the same ...
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. S = setfield(S, 'a' ,{3:5},[0 -50 -100]) S = struct with fields:
For all the elements in person structure array, assign the same value (3) to the NumberOfsiblings field, of the Family field. [person(1:4).FamilyInfo.NumerOfsiblings] = 3; ... because matlab does not copy the type of fields when it grows structure arrays. So if you actually want to have the correct FamilyInfo substructure after growing, ...
Value to Assign: A (1 2 11 12)=30; After that, A= [30 30 0 0 0 0 0 0 0 0 0 0 30 30] Now, I wanna assign the value A (2 10 12)=20 to the same array. But, value of the new array will be the sum of previous if the index matches. Like: A (2)=30+20.
I have a column vector of size 20073 x 1 from a previous model output (the steady state run), and I would like to copy all the values from the column vector into the corresponding indices of the first column of an array of size 20073 x 688 in my transient run.
2. Another solution can be. a = cell(10,1); a([1,3]) = {[1,3,6,10]} This may seem to be an unnecessary add, but say that you wants to assign a vector to 3 cells in an 1D cell array of length 1e8. If a logical is used, this would require creation of a logical array of size almost 100Mb. answered May 9, 2014 at 13:57.
Assign value to an array . Learn more about value, array, double, assign, position Hi all, I would like to assign a specific value to a specific position into an array.
A multidimensional array in MATLAB® is an array with more than two dimensions. In a matrix, the two dimensions are represented by rows and columns. ... assign another 3-by-3 matrix to the index value 2 in the third dimension. The syntax A(:,:,2) ... Another way to quickly expand a multidimensional array is by assigning a single element to an ...
The index position in a matrix/array in Matlab starts from 1 and not 0. So replace all the for loops from 1 to required length. Corrected code is given below.
Create a field named title. S = setfield(S,{1}, 'title', 'y = sin(x)') S= 1×2 struct array with fields: x. y. 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.
cellfun expects a cell array as the input into the function. You have a numeric array so use arrayfun instead. You are also not outputting a scalar per element in the array so you need to set the UniformOutput flag to 0. Finally, use the colon operator to do what you need instead of matrix multiplication. The output will unfortunately be a row vector of cells so if you absolutely need a column ...