[英]How to create a custom colormap with black under a specific threshold with Seaborn
I have velocity values ranging from 0 to 4000 (m/year) and I would like a colormap like the one in the photo example, but with everything under 1000 being black.我的速度值范围从 0 到 4000(米/年),我想要一个像照片示例中那样的颜色图,但 1000 以下的所有内容都是黑色的。 Any idea on how to do that?关于如何做到这一点的任何想法? I have been trying with center
but without success.我一直在尝试使用center
,但没有成功。 The code I use is:我使用的代码是:
# Plot Hovmoller diagram
# turn the axis label
df_velocity = df_velocity.sort_index()
df_velocity2 = df_velocity.fillna(0) # I replace all my nans by zeros otherwise there are too many holes in my plot
plt.figure(figsize=(15,15))
ax = sns.heatmap(df_velocity2,vmin=0, vmax=4000)#,center=1000)
Try setting cmap.set_under('black')
with vmin=1000
, eg:尝试使用vmin=1000
设置cmap.set_under('black')
,例如:
data = np.linspace(0, 60)[:, None] * np.linspace(0, 60)
cmap = matplotlib.cm.get_cmap('viridis').copy()
cmap.set_under('black')
sns.heatmap(data, vmin=1000, vmax=4000, cmap=cmap, cbar_kws=dict(extend='min', extendrect=True))
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