simple trapz function integration problem

Hi all,

I have simple code to integrate the matrix using trapz. I don't want to include NaN number on the matrix in the integration, but the code just give zero value at the end.

Here is the code:

            x=[1 3 4 NaN; 5 6 8 7];

            for i=1:2;
             for j=1:4;
                if isnan(x(i,j));
                   y(i,j)=trapz(x(i,j));
                else y(i,j)= NaN;
                end;
            end;
            end;

Maybe anyone can help, thanks.

[Gang-Gyoo]

Try to use this code:

x=[1 3 4 NaN; 5 6 8 7];
s1= trapz(x(1,1:3))
s2= trapz(x(2,:))