Remove zeros and perform calculation with non-zero elements

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.

Answer 1

[Sean de Wolski]

Extract the elements in C where B is nonzero

D = C(B~=0)

Extract the nonzero elements of B into D

D = nonzeros(B)

[Damith]

Thanks.

Answer 2

[per isakson]

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.

[Damith]

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

[per isakson]

See Seans answer.