Question

我一直在尝试解决问题，而stackoverflow和其他网站都无法帮助我。

我试图绘制一个范围从-40到36的字段（contourf），其中colorbar gist_rainbow_r有52个不连续的步骤。如您所见，水平不是等间隔的。我想要的是具有相等间距刻度的颜色条（所有级别应该等间距），具有离散化的52 gist_rainbow_r颜色的颜色。这是可能吗？下面是代码片段。

    levels = [-40,-30,-20,-15,-12,-10,-9,-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36]
    # define the colormap
    cmap = cm.get_cmap('gist_rainbow_r',52)
    # define the bins and normalize
    norm = mpl.colors.BoundaryNorm(levels, cmap.N)
    contourplot = map.contourf(xpoints,ypoints,fieldtoplot,range(-40,36),cmap=cmap,norm=norm,spacing='regular')

    ax = plt.gca()  # Gets the current axes
    divider = make_axes_locatable(ax)  # Lets us move axes around
    cax = divider.append_axes("bottom", size="2%",pad=-0.02,axes_class=maxes.Axes)  #Adds an axis for the colorbar
    F.add_axes(cax)  # Adds the new axis to the figure as the current working axis
    bar = plt.colorbar(contourplot,cax=cax,orientation='horizontal',spacing='regular',extend='both',extendfrac='auto',extendrect='True',format='%1i',ticks=levels, boundaries=levels) # Plots colorbar in new axis 
    bar.update_ticks()

祝你好运

马丁

Answer 1

实际上，解决方案非常简单，在这里写它有点尴尬......对不起打扰社区！

我们走了 - 这解决了我的问题：

levels = [-40,-30,-20,-15,-12,-10,-9,-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36]
# define the colormap
cmap = cm.get_cmap('gist_rainbow_r',52)
# define the bins and normalize
norm = mpl.colors.BoundaryNorm(levels, cmap.N)
contourplot = map.contourf(xpoints,ypoints,fieldtoplot,range(-40,36),cmap=cmap,norm=norm,spacing='uniform', levels=levels)

ax = plt.gca()  # Gets the current axes
divider = make_axes_locatable(ax)  # Lets us move axes around
cax = divider.append_axes("bottom", size="2%",pad=-0.02,axes_class=maxes.Axes)  #Adds an axis for the colorbar
F.add_axes(cax)  # Adds the new axis to the figure as the current working axis
bar = plt.colorbar(contourplot,cax=cax,orientation='horizontal',spacing='uniform',extend='both',extendfrac='auto',extendrect='True',format='%1i',ticks=levels, boundaries=levels) # Plots colorbar in new axis 
bar.update_ticks()

因此，要明确：将“间距”设置为“均匀”（并且不等于 - 通过查看colorbar.py我注意到此设置根本不存在）并将“级别”传递给contourf函数。

此时：感谢@Saullo Castro部分回答这个问题！

干杯

马丁

matplotlib：不等间距的刻度/特定颜色的零

1 个答案: