在Python中如何绘制连接参数空间图中最大点的线? #python

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英文:

How to plot a line joining maximum point on a spatial plot of a parameter in python? #python

问题

我在纬度和经度上有一个相对涡度图。现在我想在该图上绘制一条线,该线将连接每个经度上的最大点。
我已经附上了相对涡度图
相对涡度

我期望得到一条连接每个经度上的最大点的线。
我尝试了以下代码Python代码
但我得到了一个一维数组。我需要一个二维数组,以便我可以得到一个空间图。

英文:

I have a relative vorticity plot at latitude and longitude. Now I want to draw a line over that plot which will join only maximum points at each longitude.
I have attached the relative vorticity plot
Relative vorticity

I am expecting a line that will join maximum point at each longitude.
I have tried the following codePython code
But I am getting a 1D array. I need 2d array so that I can get a spatial plot.

答案1

得分: 0

我假设你在使用 xarray,你需要用 argmax 而不是 maxmax 会获取实际的最大值,而 argmax 则会显示该值的索引。请注意,这将生成一个一维数组,而不是二维数组。我不确定你在图表上使用的是什么,但如果图像上的位置是索引,你可以像绘制普通线条一样绘制它,比如 y = mx + b 类型的东西。如果你正在使用 matplotlib:

dset2 = dset1.argmax(dim='latitude')
plt.plot(range(len(dset2)), dset2)
plt.show()

https://docs.xarray.dev/en/stable/generated/xarray.DataArray.argmax.html

(另外,你可能想将你的原始代码放在文本中,而不是放在图像中,因为网址可能最终会失效,祝你好运!)

英文:

I'm assuming you're using xarray, what you're looking for is argmax instead of max. max will grab the actual maximum value, where argmax displays the index of the value. Note that this will produce a 1d array, not a 2d array. I'm not sure what you're using for your graphing, but if the positions on the image are indexes then you can just plot it like you would a normal line, like y = mx + b type of stuff. If you're using matplotlib:

dset2 = dset1.argmax(dim='latitude')
plt.plot(range(len(dset2), dset2))
plt.show()

https://docs.xarray.dev/en/stable/generated/xarray.DataArray.argmax.html

(also you may want to put your original code in the text instead of an image, some people will downvote for that because the url may eventually expire, good luck!)

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  • 本文由 发表于 2023年3月31日 20:08:50
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