How do I convert the weird magnitudes in the results to zero ?

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JMS 2014-5-6

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编辑： Mischa Kim 2014-5-6

Hi,

When I run the below program, I got some "NaN" in the results. So, I want to convert those "NaN" to be "Zeros" and I think the way to do it is using the for-loop but I am not sure how to do it due to the meshgrid, any idea please?

"

[x,y] = meshgrid(-5: .125: 5, -5: .125: 5);

x1 = -1;

y1 = 0;

V_x1 = ((y-y1)./((x-x1).^2+(y-y1).^2));

V_x1 = V_x1 (:)

fid = fopen('outputData.txt','wt');

fprintf(fid,'%.8f\n',V_x1);

fclose(fid);

"

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Answer 1

Mischa Kim 2014-5-6

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https://ww2.mathworks.cn/matlabcentral/answers/128475-how-do-i-convert-the-weird-magnitudes-in-the-results-to-zero#answer_135799

编辑：Mischa Kim 2014-5-6

在 MATLAB Online 中打开

JMS, use something like

 data = [1 2 NaN; 3 NaN 4];
 data(isnan(data)) = 0;

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Mischa Kim 2014-5-6

编辑：Mischa Kim 2014-5-6

在 MATLAB Online 中打开

Not quite sure I understand...

 data = randi(2,10^1)    % create 10-by-10 with 1s and 2s
 data(data==2) = NaN     % replace 2s by NaNs
 tic
 data(isnan(data)) = 0   % replace NaNs by 0s
 toc                     % ...computation time

This approach will also work for larger matrices.

Try increasing the number of elements to 10^2 or 10^3 and don't forget to add semi-colons for larger matrices.

JMS 2014-5-6