[Octave-bug-tracker] [bug #42311] colorbar incorrect after setting log scale

[ederag]

Follow-up Comment #7, bug #42311 (project octave):

This is a regression in octave-4.4.0.
At least with octave-4.2.1 it was possible to
create a fake axis to attach a standalone colormap
with log scale ticks:


graphics_toolkit("gnuplot")
figure
x = -3:3;
y = x.';
S = exp(-(x.^2 + y.^2));
pcolor(x, y, log10(S))

log_clims = get(gca, "clim");

ax_cb = axes;
set(ax_cb, "visible", "off")
caxis(ax_cb, 10.^(log_clims))
cb = colorbar(ax_cb)
set(cb, "yscale", "log")
set(cb, "yminortick", "on")


But the correct fix is probably to implement the "ColorScale" property:
https://fr.mathworks.com/help/matlab/ref/matlab.graphics.axis.axes-properties.html#budumk7-ColorScale

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