Prohibit "pcg" writing to command window

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Daniel Döhring 2018-7-4

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https://ww2.mathworks.cn/matlabcentral/answers/408766-prohibit-pcg-writing-to-command-window

评论： Josh Meyer 2019-9-23

Hello,

I got a more cosmetic question concerning matlab function "pcg" https://de.mathworks.com/help/matlab/ref/pcg.html. Is there a way to prevent a command line output from pcg after each (un)successful call? It is annoying and might even slow my program down due to the writing to the command window. Thanks in advance, Daniel

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Geoff Hayes 2018-7-5

Daniel - what does the output of a successful call look like?

Daniel Döhring 2018-7-5

My whole command winwo is full of these messages, is there a way to suppress these messages?

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Geoff Hayes 2018-7-5

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在 MATLAB Online 中打开

Daniel - Wow that is busy. Perhaps try doing

 [x,~,~,iter] = pcg(Id-(tspan(i+1)-tspan(i))*A, U(:,i));
 U(:,i+1) = x;

I noticed that if I just did

[x] = pcg(Id-(tspan(i+1)-tspan(i))*A, U(:,i));

then I would observe the pcg converged at ... message. But with the other line of code where I have an iteration output parameter, iter, then the message is suppressed.

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Daniel Döhring 2018-7-5

This works out, thanks!

Josh Meyer 2019-9-23

To clarify for future readers: if you specify the second FLAG output then the function stops printing convergence information to the command window. Instead the value of the FLAG output conveys whether the attempt was successful.

[x,flag] = pcg(...)

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