This error occurs when you attempt to assign elements to an existing array, but the size of the variable you are trying to assign is not compatible with the existing array. For example, the following code snippet produces this error:
A = [1 2 3; 4 5 6];
B = [7 8 9 10];
A(2,:) = B
In this case, 'A' has size 2x3, that is, 2 rows and 3 columns. The vector 'B' has size 1x4, 1 row and 4 columns. The assignment statement attempts to replace the second row of 'A' with the row vector 'B', but this is not possible because 'B' has 4 columns, and 'A' only has 3 columns. In order to assign to the second row of 'A', you must use a vector with 3 columns. For example,
B = [11 12 13];
A(2,:) = B
For more information on indexing in MATLAB, see the following documentation page:
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