How do I change Array element with another array element?

Question

Nick 2022-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/1853133-how-do-i-change-array-element-with-another-array-element

回答： Voss 2022-11-16

I am new to matlab and I apologize if my question confuses you.

Basically, if i have an array A = [0 0 0 0] and then I want to replace each value with another Array B [1 1 0 0] how would I go about that? The reason for this is because A is a temp array and I would be adding it into another larger array, so a 2d matrix.

so B is an input to a function, and I am replacing the values of A with B, then doing some math operations and then adding the final product to another Array C.

Thank you,

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Answer 1

David Hill 2022-11-16

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A = [0 0 0 0];
B = [1 1 0 0];
A=B
A = 1×4
     1     1     0     0

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Answer 2

Voss 2022-11-16

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A = [0 0 0 0];
B = [1 1 0 0];

To replace each element of A with the corresponding element of B:

A = B; % since A and B are the same size, just replace all of A with B

or:

A(:) = B; % to preserve the size of A when B has different size
          % (as long as the number of elements is the same)

An example of the second usage:

A = [0 0 0 0] % 1-by-4
A = 1×4
     0     0     0     0
B = [1 2; 3 4] % 2-by-2
B = 2×2
     1     2
     3     4
A(:) = B % A stays 1-by-4, but now it contains the elements of B in (column-major) order
A = 1×4
     1     3     2     4