New install 2021a not plotting data

Just upgraded from 2019b to 2021a. Standard workflow for plotting data not working in 2021a.

Variable: Y is 5500000x1 double containing reals from -500 to +500 at 4 decimal precision

Calling figure; plot(Y) gives this error:

Array indices must be positive integers or logical values.

Error in matlab.graphics.shape.internal.ScribeStackManager/findLayer

Error in matlab.graphics.shape.internal.ScribeStackManager/getLayer

Error in newplot (line 77)

ax = gca(fig);

Error in matlab.graphics.internal.newplotwrapper (line 11)

axReturn = newplot(varargin{:});

Same data, same command in 2019b plots without issue. Note, even setting Y = [1;2;3;4] and calling plot(Y) fails and gives same error. Is this an installation problem? Some weird incompatibility?

[Konrad]

Hi,

Y = [1;2;3;4];
plot(Y)

works for me in 2021a.

Maybe you have redefined your plot-function? Is there a plot.m file somewhere on your search path?

Best, Konrad

[howe]

Thanks Konrad. No, I haven't redefined anything - frankly just installed the update to 2021a less than an hour ago. I think my install must be glitchy.

[Konrad]

Yes, thats weird! I'd rerun the installer.

Answer 1

[Steven Lord]

Let's make sure you haven't accidentally written or downloaded a function that is taking precedence over the built-in functions and the functions included in MATLAB. What do these commands display?

which plot

built-in (/MATLAB/toolbox/matlab/graph2d/plot)

which gca

built-in (/MATLAB/toolbox/matlab/graphics/gca)

which newplot

/MATLAB/toolbox/matlab/graphics/axis/newplot.m

which get

built-in (/MATLAB/toolbox/matlab/graphics/objectsystem/get)

[howe]

Steven, as outlined below, none of the functions were overwritten. I reinstalled (clean) and got the same problem. Found a solution to fix the problem transiently (while in same session):

restoredefaultpath
rehash toolboxcache
savepath

So something is going wrong with the path.

I can live with this. But another problem has arisen: now I can't open apps, such as the Signal Analyzer. Matlab just hangs, indefinitely (like overnight if allowed), trying to open the app. Any thoughts on this would be appreciated, especially since: 1) R2019 was working perfectly in my hands for years; 2) I reinstalled R2021a twice and still have the same trouble. Thanks.

Answer 2

[howe]

Thanks Steven.

built-in (C:\Program Files\MATLAB\R2021a\toolbox\matlab\graph2d\plot)

built-in (C:\Program Files\MATLAB\R2021a\toolbox\matlab\graphics\gca)

C:\Program Files\MATLAB\R2021a\toolbox\matlab\graphics\axis\newplot.m

built-in (C:\Program Files\MATLAB\R2021a\toolbox\matlab\graphics\objectsystem\get)

Returns look correct.

[howe]

I am starting to get all sorts of weird errors. I suspect something didn't work correctly with the install. I was just running some basic calculations on arrays and got the following error chain:

Warning: Error occurred while executing the listener callback for event POST_REGION defined for class matlab.internal.language.RegionEvaluator:

Error using set

Too many input arguments.

Error in findall>showHiddenHandlesToFindAllHandles (line 53)

set(rootobj,'ShowHiddenHandles','on');

Error in findall (line 37)

c = onCleanup(showHiddenHandlesToFindAllHandles(rootobj));

Error in matlab.internal.editor.FigureManager

Error in matlab.internal.editor.FigureManager

Error in matlab.internal.editor.FigureManager

Error in matlab.internal.editor.FigureManager.snapshotAllFigures

This is what I was wunning (as livescript):

eeg=A01D0;
efreq=1000; %1000 Hz sampling
epochlength=1000; %1 second at 1000 Hz

sz=length(eeg);
numepochs=floor(sz/epochlength)-1;
linelen=0;
L = zeros(numepochs,1);

for ct = 1:numepochs
    start = (ct-1)*epochlength+1;
    stop = ct*epochlength;
    for e = start:stop
        linelen = linelen + abs(eeg(e,1));
    end
    L(ct,1)=linelen;
    linelen = 0;
end