python runtime_error ai_generated true

ValueError: Unable to determine Axes to steal space for Colorbar. Either provide the *cax* argument or pass *ax* or *axes* to the colorbar() method.

ID: python/matplotlib-colorbar-mappable-error

Also available as: JSON · Markdown · 中文
80%Fix Rate
88%Confidence
0Evidence
2024-07-22First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

Calling plt.colorbar() with no current image/mappable or after clearing the axes, so matplotlib has no parent axes to attach the colorbar to.

generic

中文

在没有当前图像/mappable 或清空坐标轴后调用 plt.colorbar()，matplotlib 没有父坐标轴可附加色条。

Workarounds

  1. 96% success 
    im = ax.imshow(data)
fig.colorbar(im, ax=ax)
  2. 93% success 
    fig, (ax, cax) = plt.subplots(1, 2, gridspec_kw={'width_ratios':[4,1]})
im = ax.imshow(data)
fig.colorbar(im, cax=cax)

Dead Ends

Common approaches that don't work:

  1. 95% fail

    There is no mappable yet, so the same ValueError is raised.

  2. 80% fail

    The fig keyword does not tell matplotlib which axes to steal space from.