python - Force use of scientific style for basemap colorbar labels -


string formatting can used specify scientific notation matplotlib.basemap colorbar labels:

cb = m.colorbar(cs, ax=ax1, format='%.4e')

but each label scientifically notated base.

if numbers large enough, colobar automatically reduces them scientific notation, placing base (i.e. x10^n) @ top of color bar, leaving coefficient numbers labels.

you can standard axis following:

ax.ticklabel_format(style='sci', axis='y', scilimits=(0,0))

is there equivalent method matplotlib.basemap colorbars, or perhaps standard matplotlib colorbar?

there's no one-line method, can updating colorbar's formatter , calling colorbar.update_ticks(). 

import numpy np import matplotlib.pyplot plt  z = np.random.random((10,10))  fig, ax = plt.subplots() im = ax.imshow(z) cb = fig.colorbar(im)  cb.formatter.set_powerlimits((0, 0)) cb.update_ticks()  plt.show()

enter image description here

the reason odd way of doing things colorbar has statically assigned ticks , ticklabels. colorbar's axes (colorbar.ax) ranges between 0 , 1. (therefore, altering colorbar.ax.yaxis.formatter doesn't useful.) tick positions , labels calculated colorbar.locator , colorbar.formatter , assigned when colorbar created. therefore, if need precise control on colorbar's ticks/ticklables, need explicitly call colorbar.update_ticks() after customizing how ticks displayed. colorbar's convenience functions behind scenes, far know, want can't done through method.


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