[英]Add custom logarithmic tick location to matplotlib
I have a line plot, where the x-axis is logarithmic.我有一条线 plot,其中 x 轴是对数的。 I would like to mark a specific value on this axis (40000).
我想在这个轴上标记一个特定的值(40000)。 This means I would like to insert a custom major tick at this location.
这意味着我想在这个位置插入一个自定义的主要刻度。 I've tried to explicitly set the xticks using
set_xticks()
generated from numpy's logspace
which kinda works, but does not automatically add a label for the extra tick.我尝试使用从 numpy 的日志空间生成的
set_xticks()
显式设置logspace
,这有点工作,但不会自动为额外的刻度添加 label。 How can I do that?我怎样才能做到这一点? Also, can I customize the grid line for this extra tick?
另外,我可以为这个额外的刻度自定义网格线吗?
fig = plt.figure(figsize=(12, 8))
ax = fig.add_subplot(1, 1, 1)
ax.plot(np.power(sizes, 2), hsv_mat_times, label="HSV Material Shader")
ax.plot(np.power(sizes, 2), brick_mat_times, label="Brick Material Shader")
ax.set_title("Python Shader Rendering Performance")
ax.set_xlabel("Number of Pixels")
ax.set_ylabel("CPU Rendering Time (ms)")
formatter = FuncFormatter(lambda x, pos: "{:.3}".format(x / 1000000))
xticks = np.logspace(2,6,num=5)
xticks = np.insert(xticks,4,200*200)
ax.set_xscale("log")
ax.set_xticks(xticks)
ax.legend()
plt.show()
And this is the output I get with the desired output marked.这是我得到的 output,上面标有所需的 output。
Edit Thanks for the answers, they are great solutions using FuncFormatter
.编辑感谢您的回答,它们是使用
FuncFormatter
的绝佳解决方案。 I did however stumble across a solution using axvline
to add a vertical line at 200x200.然而,我确实偶然发现了一个使用
axvline
在 200x200 处添加垂直线的解决方案。 This is my new solution, using minor ticks for the extra tick.这是我的新解决方案,使用次要刻度作为额外刻度。
def log_format(x, pos):
return "$200\\times 200$"
fig = plt.figure(figsize=(12, 8))
ax = fig.add_subplot(1, 1, 1)
ax.plot(np.power(sizes, 2), hsv_mat_times, label="HSV Material Shader")
ax.plot(np.power(sizes, 2), brick_mat_times, label="Brick Material Shader")
ax.plot(np.power(sizes, 2), hsv_mat_times2, label="PLACEHOLDER FOR 3rd shader")
ax.set_title("Python Shader Rendering Performance", fontsize=18)
ax.set_xlabel("Number of Pixels")
ax.set_ylabel("CPU Rendering Time (ms)")
ax.set_xscale("log")
ax.set_xticks([200*200], minor=True)
ax.xaxis.grid(False, which="minor")
ax.axvline(200*200, color='white', linestyle="--")
ymin,ymax = ax.get_ylim()
ax.text(200*200 - 200*50, (ymax-ymin)/2, "Default render size", rotation=90, va="center", style="italic")
ax.xaxis.set_minor_formatter(FuncFormatter(log_format))
ax.legend()
plt.show()
You can give a try to use ScalarFormatter()
after setting the xticks.您可以在设置 xticks 后尝试使用
ScalarFormatter()
。
xticks = np.logspace(2,6,num=5)
xticks = np.insert(xticks,4,200*200)
ax.set_xscale("log")
ax.set_xticks(xticks)
# add this line
ax.get_xaxis().set_major_formatter(matplotlib.ticker.ScalarFormatter())
A similar question has been asked previously.之前有人问过类似的问题。 You can check that as well set ticks with logarithmic scale
您还可以检查是否使用对数刻度设置刻度
There is a post explaining in-depth for the log scalehttps://atmamani.github.io/cheatsheets/matplotlib/matplotlib_2/有一篇文章深入解释了对数刻度https://atmamani.github.io/cheatsheets/matplotlib/matplotlib_2/
I hope it helps:-)我希望它有帮助:-)
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.