cant show any plot

[VictorGerin]

If a try show a plot i cant, because i cant use pause or input and if a does the plot crashes

[paulo-fernando-silva]

HI, can you post a simple sample that reproduces this issue? Thanks

[VictorGerin]

of course first a small video and i will share my code and my data file

https://user-images.githubusercontent.com/12161688/111500731-10c6c800-8723-11eb-8f13-c021e233ca82.mp4

Teste_rapido_final.zip

` clear all; close all; clc; pkg load signal;

C:\Users\victo\OneDrive\�rea de Trabalho\signal.csv

fid = fopen ('C:\Users\victo\OneDrive\�rea de Trabalho\signal.csv', 'r')

divisor = 40; Fs = 5e6 / divisor; M = dlmread('Teste_rapido_final.csv',';',2,0);

tempo = decimate(M'(1, :)', divisor) ; voltage = decimate(M'(2, :)', divisor) ;

M = 5; voltageFiltrado = filter((1/M)*ones(1,M),[1 zeros(1,M-1)], voltage);

a = 0.5;

m = 5;

voltageFiltrado = ((1-a)/(1-a*voltage^-1) )^m

figure;

subplot(2, 1, 1); [ax, h1, h2] = plotyy( tempo, voltage, tempo, voltageFiltrado );

set(ax(1),'YLim',[-10 10]) set(ax(2),'YLim',[-10 10])

figure;

Nfft = length(tempo); fvec = (-Nfft/2 : Nfft/2 - 1) * Fs / Nfft; fvec = fvec'; Xreal = fftshift( fft(voltageFiltrado, Nfft) );

[a, b] = max( abs (Xreal) );

fvec(b)

subplot(2, 1, 2); plot( fvec, 20*log10(abs(Xreal)) ); pause()

subplot(3, 1, 3);

figure;

specgram(voltageFiltrado, 32, Fs)

subplot (2, 1, 1)

fplot (@sin, [-10, 10]);

subplot (2, 1, 2)

fplot (@cos, [-10, 10]);

input()

`

[paulo-fernando-silva]

I can try to take a look this weekend. Right now I believe this might be related to issue #24 In that issue I suggested to use

while true
  pause (1000/60);
end
print("Quitting...");

at the end of the code. That somehow seemed to help. Another option is setting the "autoTerminate": false, I can't remember exactly, but that might help. You'll have to press stop manually in that case.

[paulo-fernando-silva]

I tested that program on maxOS and it works without crashing with "autoTerminate": set to either false or true. But I guess that might be because of octave using aquaTerm on macOS. Did you test "autoTerminate": false ? Did it help?

[VictorGerin]

yes i did use autoTerminate = false, the plot didn't show.

[1am]

Hello. I'm experiencing the same on Ubuntu 20 and the only thing that helps is the while true loop at the end of the program. My script is very simple:

W = randn(1, 10000)
hist(W)

The plot only shows when the loop is there at the end.

If I set "autoTerminate": false the plot is not showing up (unless the loop at the end). If I have both "autoTerminate": false and the loop then on the other hand VSCode seems to disattach from octave-cli because stopping the program does not cause the plot to disappear after debug stops. What i need to do then is killall octave-cli to make the plot disappear.

So in short, in my case I need both "autoTerminate": false and the loop at the end.

Don't know if this helps but sharing my findings as I just started using Octave and your plugin, which I find great and very useful.

[1am]

Actually I've later found that the plots displayed with the while loop didn't have working cursors so I tried launching my octave script by octave command and the plot showed for just a moment and closed by itself. Then I've found this great StackOverflow thread https://stackoverflow.com/questions/52569584/octave-how-to-prevent-plot-window-from-closing-itself and what helped in my case is adding a waitfor call after the plot. I still get left over with bunch of abandoned octave-cli processes but it's better now.

Or even better - https://stackoverflow.com/a/62340602 which in an example below works great for me - just press any key to close the window and no octave-cli processes get left over

t = [0:0.01:0.98]
y1 = sin(pi * 2 * t)
plot(t, y1)
while (waitforbuttonpress ()==0) pause(1) end

[paulo-fernando-silva]

Hi Piotr, that's a great find. I like that solution so much I've decided to add it to the plugin readme. This seems to be a problem with octave scripts in general, but that solution also solves issue #24

In practice the "autoTerminate": false is not needed as the script will never exit due to the while loop. I've also tested setting a breakpoint on the last line where I added a disp('done...'). This will also prevent the script from exiting, so no loop is needed. You can still view the output as follows:

But checking for the keypress to exit works well for interactive UI elements such as sliders which was the case in issue #24. Additionally, I tested this using a virtualized windows 10 installation, and was able to get the code provided by @VictorGerin to work. I installed octave and set the path as follows:

Then I set "octave": "octave-gui" as "octave": "octave-cli"uses fltk and that's a bit wonky on windows. It seems to work properly. @VictorGerin let me know if this works for you.