How to modift gplotmatrix legend marker size?

Hi all,

I have a pretty huge timetable Qmz (83955x272) and an array TimeCode(table, 83955x1) which identifies certain meteo conditions (number from 0 to 4).

I want to plot the Qmz data with different color in function of the values in TimeCode.

Qmz=table2timetable(OriginalData);

TimePamCode.Properties.VariableNames(1) = "Code";

P=gplotmatrix(Qmz.DateTime,Qmz.(4),TimePamCode.Code);

h = findobj('Tag','legend');

set(h, 'String', {'No data','Ambient','Ambient2','Ambient3','Ambient4'})

I'm happy of the result but how to handle the color (with customized ones) of the markers plotted with gplotmatrix and (MAINLY) how to increase the size of the marker in the legend? I cannot see the point and then the color!

Cheers

Answer 1

[Taylor]

https://www.mathworks.com/help/stats/gplotmatrix.html?s_tid=doc_ta#mw_f131a46d-17ee-4a14-a3b8-45d0317f69bc

https://www.mathworks.com/help/stats/gplotmatrix.html?s_tid=doc_ta#mw_7b0f2f5a-3e46-48a8-8042-ebbaadaf8d92

[Dyuman Joshi]

That marker size does not affect the markers displayed in the legend, which is what OP is asking about.

[Taylor]

https://www.mathworks.com/matlabcentral/answers/50250-how-can-i-change-the-marker-size-in-legend

[Luca D'Angelo]

Hi Taylor, thank you for your reply.

I've tried the method suggested by Adam Danz and I got this error.

ax = axes();

hold on

gplotmatrix(Qmz.DateTime,Qmz.(i),TimePamCode.Code);

% copy the objects

hCopy = copyobj(h, ax);

Error using copyobj

Copyobj cannot create a copy of an invalid handle.

Is it this one the one did you refer to?

[Taylor]

Both methods from Shawn Daugherty and Adam Danz should work. The pain with each of them is that, in those methods, you have access to the legend and icon objects. That object is not immediately available to you when using gplotmatrix. You can access them after the legend has been created, but it is much more straightforward to return them when you create the legend. To that end, I recommend opening the gplotmatrix function with:

open gplotmatrix

Then, save a copy as "gplotmatrix2" or something along those lines. In the copied file, edit line 404 so that you return the legend and icon objects. Finally, incorporate either method to change the legend icon marker size. Save the file again, and call it in the future instead of the original gplotmatrix.

[Luca D'Angelo]

Do you mean like this?

if (doleg)

gn = gn(ismember(1:size(gn,1),g),:);

[ax, h]= legend(ax(1,cols),gn);

end

[Taylor]

Exactly. Following Daugherty's method you would also add

% Find the 'line' objects
h = findobj(h,'Type','line');
% Find lines that use a marker
h = findobj(h,'Marker','none','-xor');
% Resize the marker in the legend
set(h,'MarkerSize',20);

before the "end".

[Luca D'Angelo]

thanks a lot!