How can I make a gif using subplots and avoid an error in function wgifc?
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David Kaeser
el 10 de Nov. de 2021
Comentada: David Kaeser
el 17 de Nov. de 2021
Hi everyone,
I am trying to generate a gif of my results over different timestep using the following procedure:
h = figure;
filename = 'testnew51.gif';
axis tight manual % this ensures that getframe() returns a consistent size
for t=10:10:100 % t is the percent number in the file name
subplot(121)
fn = "T_timestep_"+t+"_precent.bin";
fid = fopen(fn); % file for t-th step
nx = fread(fid,1,'int32');
ny = fread(fid,1,'int32');
T = reshape(fread(fid,nx*ny,'double'),nx,ny);
fclose = (fid);
contourf(T')
colorbar;
subplot(122)
fn = "S_timestep_"+t+"_precent.bin";
fid = fopen(fn); % file for t-th stepfid = fopen('S.bin');
nx = fread(fid,1,'int32');
ny = fread(fid,1,'int32');
S = reshape(fread(fid,nx*ny,'double'),nx,ny);
fclose = (fid);
contourf(S')
colorbar;
drawnow
% Capture the plot as an image
frame = getframe(h);
im = frame2im(frame);
[imind,cm] = rgb2ind(im,256);
% Write to the GIF File
if t == 1
imwrite(imind,cm,filename,'gif', 'Loopcount',inf);
else
imwrite(imind,cm,filename,'gif','WriteMode','append');
end
pause(0.2)
end
However I get the error:
Error using wgifc
Can only append to GIF89a format GIFs.
Error in writegif (line 306)
wgifc(mat, map, filename,writemode,disposalmethod,delaytime,...
Error in imwrite (line 566)
feval(fmt_s.write, data, map, filename, paramPairs{:});
Error in matlab_run (line 34)
imwrite(imind,cm,filename,'gif','WriteMode','append');
How can I resulve that? Or is there a better way to generate a gif?
And also how can I scale the x-axis and y-axis of the subplots in respect of an scaled entity of nx and ny respectively? So that the ratio of the subplots are representing my original grid.
Thanks a lot already in advance for all your help and time.
0 comentarios
Respuesta aceptada
Walter Roberson
el 17 de Nov. de 2021
Your t==1 test is never successful because your for loop is t=10:10:100 and so starts with 10 instead of 1
Más respuestas (1)
Jan
el 10 de Nov. de 2021
Editada: Jan
el 10 de Nov. de 2021
The calling style "subplot(121)" is outdated for over 20 years now. Use subplot(1, 2, 1) instead.
You can simplify:
reshape(fread(fid,nx*ny,'double'),nx,ny)
to
fread(fid, [nx, ny],'double')
This line redefines the command fclose as a variable:
fclose = (fid);
You want this instead:
fclose(fid);
I guess, that the number of unclosed files stops opening a new file, because the number of simultaneously open files is limited by the operating system. The error message would be misleading, if this is true.
Use fclose('all') in the command window to clean up the already open files or restart Matlab.
how can I scale the x-axis and y-axis of the subplots in respect of an scaled entity of nx and ny respectively? So that the ratio of the subplots are representing my original grid.
I'm not sure, what this means. Maybe:
axesH = subplot(1, 2, 1);
axis(axesH, 'equal');
18 comentarios
Walter Roberson
el 16 de Nov. de 2021
To check: are you doing the isfile() before you do the imwrite 'loopcount' call, or after that call? The file is not expected to exist until after the call.
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