Remove zeros and perform calculation with non-zero elements

Question

Damith 2014-6-2

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https://ww2.mathworks.cn/matlabcentral/answers/132138-remove-zeros-and-perform-calculation-with-non-zero-elements

评论： Damith 2014-6-2

Hi,

I have a array of B with 403 elements (403 x 1). Some of the values are qual to zero but I want to remove the zeros from the array and perform a calculation with non-zero elements. After the calculation with non-zero elements, the new values need to be replaced with old values.

Can anybody help me how I can do it MATLAB?

Thanks,

Dumindu.

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Answer 1

Sean de Wolski 2014-6-2

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https://ww2.mathworks.cn/matlabcentral/answers/132138-remove-zeros-and-perform-calculation-with-non-zero-elements#answer_139217

编辑：Sean de Wolski 2014-6-2

在 MATLAB Online 中打开

Extract the elements in C where B is nonzero

D = C(B~=0)

Extract the nonzero elements of B into D

D = nonzeros(B)

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Damith 2014-6-2

Thanks.

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Answer 2

per isakson 2014-6-2

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https://ww2.mathworks.cn/matlabcentral/answers/132138-remove-zeros-and-perform-calculation-with-non-zero-elements#answer_139213

编辑：per isakson 2014-6-2

在 MATLAB Online 中打开

Hint

B(not(B==0)) = perform_calculation( B(not(B==0)) );

where

    function M2 = perform_calculation( M1 )
        % calculations    
    end

If calculations use more variables make perform_calculation a nested function to make the variables of the caller available to calculations.

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Damith 2014-6-2

How can I select the non-zero elements of B to a different array?

per isakson 2014-6-2

See Seans answer.

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