Adding values in an array within limits

Question

Nikolas Spiliopoulos 2017-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/332539-adding-values-in-an-array-within-limits

编辑： Stephen23 2017-3-29

Hi all,

I have a vector A=[1 2 3 4 5 4]'

I would like to get from vector A, a vector B where its elements are the same with A, until the cumulative sum becomes 9. When the limit of 9 is reached the rest of the elements will be zero.

So the vector B will be : B=[1 2 3 3 0 0]'

I don't know if I explained it well

thanks in advance

Nikolas

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Answer 1

Adam 2017-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/332539-adding-values-in-an-array-within-limits#answer_260858

编辑：Adam 2017-3-29

在 MATLAB Online 中打开

B = zeros( size( A ) );
validIdx = cumsum( A ) <= 9;
B( validIdx ) = A( validIdx );
B( nnz( validIdx ) + 1 ) = 9 - sum( B );

would work, assuming you just clip the final value so you have a sum of 9.

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Answer 2

Stephen23 2017-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/332539-adding-values-in-an-array-within-limits#answer_260859

在 MATLAB Online 中打开

>> A = [1;2;3;3;5;4];
>> B = A.*(cumsum(A)<=9)
B =
   1
   2
   3
   3
   0
   0

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Nikolas Spiliopoulos 2017-3-29

Basically my vector is A = [1;2;3;4;5;4]; not A = [1;2;3;3;5;4];

thanks!

Stephen23 2017-3-29

编辑：Stephen23 2017-3-29

@Nikolas Spiliopoulos: you can use whatever vector you want.

I just used the vector that fitted your desired output, which you gave as "B=[1 2 3 3 0 0]'". Did I guess wrong? If you could please explain the reason for why the fourth elements of A and B should be different, then I can show you how to achieve what you want.

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