Comments (3)
If you pass vmin
and vmax
to contourf
directly, they will be used:
ax.contourf(chl.lon, chl.lat, chl.values, norm='log', vmin=0.01, vmax=10, levels=30, cmap='Fire', )
But it's definitely not right to just ignore norm_kw
. Just pushed a patch (5b09d89), now cmap_wrapper
checks to see if vmin
and vmax
were passed in the norm_kw
dictionary.
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@lukelbd, FYI, this solution doesn't work. I forgot I tried that before.
plot.rc['geogrid.alpha'] = 0
plot.rc.fontname = 'Helvetica Light'
f, ax = plot.subplots(proj='cyl', axwidth='8cm',)
p = ax.contourf(chl.lon, chl.lat, chl, norm='log', vmin=0.01, vmax=10, levels=30)
ax.colorbar(p, loc='r')
ax.format(land=True, latlim=(20, 50), lonlim=((-140, -105)))
I think you might get this behavior if you use the LogLocator directly. (https://matplotlib.org/3.1.1/gallery/images_contours_and_fields/contourf_log.html)
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Okay this patch seems to do the trick: a3ebbb1. Try:
f, ax = plot.subplots()
ax.pcolormesh(10**(np.random.rand(10,10)*5), vmin=0.1, vmax=10, norm='log', colorbar='r')
Previously if you specified both vmin
and vmax
I just set the levels to np.linspace(vmin, vmax, N)
, because most locators treat vmin
and vmax
as suggested locations, not absolute locations. For example, if you used vmax=20
, the actual level maximum would be 10
. But now this is documented, and I think it makes more sense that if you really want exact locations, you should provide your own levels
array.
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