commands like hold on, hold off, grid on not working

Hello everyone,

I'm facing issues in plotting graphs in matlab. Commands like hold on , hold off, grid on are not working.

For example when i plot a graph and use grid on command, my graph disappears and a blank figure with grid appears. Same thing happens when i use xlabel and ylabel, the plot disappers and a blank figure with only axis labelled appears. Same with plotting multiple graphs using hold on command, the first graph disappers and only new graph is plotted.

To me it seems like matlab is not able to remember the previous command while plotting graphs.

Could any one please tell me how to rectify this issue? Can re-installing the software possibly solve this issue?

[Walter Roberson]

Are you using App Designer?

[Vivek Anand]

Hi Walter Roberson, no I'm not using app designer.

[Walter Roberson]

What shows up for

which -all gcf

[Vivek Anand]

which - all gcf

↑

Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error.

To construct matrices, use brackets instead of parentheses.

>> which all gcf

built-in (C:\Program Files\MATLAB\R2021b\toolbox\matlab\ops\all)

>> all gcf

ans =

logical

1

This is what comes for all gcf

[Walter Roberson]

No space between the dash and the all. -all not - all

[dpb]

Would be interesting to see result of which as Walter asked -- should see something like

>> which -all gcf
built-in (C:\ML_R2020b\toolbox\matlab\graphics\gcf)
>> 

but if that is the problem entering

clear gcf

should clear it up.

Which release of MATLAB are you running and is this a new symptom, something that just began and this same install/version worked correctly before, or...?

Can re-installing the software possibly solve this issue?"

Possibly, yes, if it is something that has gotten corrupted in your installation...but as above, is this a new installation, new/different computer and/or OS...way too many unknowns and unknowables to venture any other guesses.

As usual, from a restart of the program, show us a specific set of commands that produces the symptoms and post the code and the result of the figure -- if there are multiple steps, the figure after each might be of interest.

[Vivek Anand]

Hello @Walter Roberson and @dpb,

This is what it shows

>> which -all gcf

built-in (C:\Program Files\MATLAB\R2021b\toolbox\matlab\graphics\gcf)

>>

@dpb Im running MATLAB R2021b version. It is newly installed and this symptom was there right from the beginning. The computer is an old one and the OS is windows 10.

[dpb]

TMW supports installation issues on new install -- but before you call official support check the published perequisities for the system -- if the system is old, it may not be supported; I forget just what criteria TMW puts on things re: the hardware end. If it runs W10 OK, that's at least a start.

Since it is an old machine, I'd check for and make sure latest video drivers are installed and also if there are any BIOS updates available from manufacturer -- but particularly concentrate on the video.

Then see the sections in doc under opengl for "Compatibility Considerations" and check out all those.

See what rendererinfo returns; try

opengl('save','software')

at command line prompt, then restart MATLAB and see if symptoms change.

If so, that would indicate issues with the hardware acceleration.

Answer 1

[Jan]

Posting code is safer than paraphrasing what the code is expected to do. To be sure: Does this reproduce the problem:

figure;
axes;
plot(rand(3, 10));
pause(2)  % Everything looks fine
grid on   % Grid appears, but lines vanish?

If so, set a breakpoint in the grid command:

dbstop in grid

Now run the code again and step through the code of grid until the observed effect occurs. Which command is it?