I found a colormap problem with Matlab 2025a

Hei. I am beginner of Mablab, today (04/19/2025, helsinki time), I played around the Matlab 2025a )pre-release(, what i want to do was to visualize the 'mpg' dataset in R. The example figure is like below:

What i got with Matlab 2025a was like:

as youcan see, the coclor bar is looks strange. So, I swithched to Matlab 2024b with same script. And i got:

colormap is back to normal now. So, i was thinking some thing happends in Matlab2025a, which i don't know.

Code (colormap from '200 colormap ' add-on):

mpg = readtable('mpg.csv');
mpg.class = categorical(mpg.class);
fig = figure;
fig.Position = [100, 100, 800, 300]; % [left, bottom, width, height];
% we need transfor the class column as catereory variable
mpg.class = categorical(mpg.class);

fig = figure;
fig.Position = [100, 100, 800, 300]; % [left, bottom, width, height]
clp = slanCM("538",7);

Unrecognized function or variable 'slanCM'.

t = tiledlayout(1,2);
ax1 = nexttile;
scatter(mpg.displ,mpg.hwy,[],mpg.class,'filled')

colormap(clp);
colorbar('TickLabels', cellstr(unique(mpg.class)));

ax2 = nexttile;
gscatter(mpg.displ,mpg.hwy,mpg.class,[],'+o*.xsd')
legend('Location','eastoutside')
axs = [ax1;ax2];
for i = 1:2
    set(axs(i), 'FontSize', 12, 'FontName', 'Times New Roman');
    axs(i).XLim = [0 8];
    grid(axs(i),'on')
end
t.TileSpacing = 'compact';
t.XLabel.String = 'Disp';
t.YLabel.String = 'Hwy';
t.XLabel.FontName = 'Times New Roman';
t.YLabel.FontName = 'Times New Roman';

[Walter Roberson]

slanCM appears to come from https://www.mathworks.com/matlabcentral/fileexchange/120088-200-colormap

[Walter Roberson]

When I use slanCM from the above link in R2025a Pre-release (on my intel iMac), I get the same plot as you show for R2025a, except that the colorbars are horizontal instead of being angled like you show.

[Liang]

@Walter Roberson yes,in mlx file. it showed the normal. but if you use code like:

exportgraphics(fig,'test.pdf')

the output pdf with that starnge colorbar....

[Walter Roberson]

Ah, I do see the odd colorbar when I exportgraphics in R2025a.

[Liang]

@Walter Roberson sí !!

[Cris LaPierre]

I would encourage you to report this directly to MathWorks here: https://supportcases.mathworks.com/mwsupport/s/casetypeselection?language=en_US&c__caseParameter=productusage&s_tid=srlp_product

[Adam Danz]

Thanks for reporting this and for the troubleshooting.

Answer 1

[Adam Danz]

Thanks for reporting this and for the troubleshooting. We were able to reproduce the issue and are working on a fix.