MATLAB: How to make new elements (columns) in a vector (matrix) based on the each value of this vector

matrixonesvector

How to expand each element of a vector with ones based on the value of this element.

For example, if vector is: A=[4 2 3 …], then the new vector will be: C=[1 1 1 1 1 1 1 1 1 …]. So, the number of how many ones depend on the value of each element of this vector A.

Thanks, Khalid

Best Answer

A=[4 2 3]
C=ones(1,sum(A))

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MATLAB: How to create a column vector where each element will be compounded amount by percentage of another vactor

You need to use the function cumprod. In your example:

 x = [.2 .3 .4]';
 z = 1000*[1; cumprod(1+x)];

This will give you what you need.

MATLAB: Double sum – vector (matrix) solution

result = sum(C(:).*F(:));

or for later versions of MATLAB

result = sum(C.*F,'all');

This all assumes that the actual indexing starts at 1, not 0 as your formula above is written, since MATLAB uses 1-based indexing.

Best Answer

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MATLAB: How to create a column vector where each element will be compounded amount by percentage of another vactor

MATLAB: Double sum – vector (matrix) solution

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