topic Graphing vertical lines in Data Management Questions

Graphing vertical lines

PattyVogel — Fri, 07 Apr 2017 17:38:48 GMT

I'm creating a vertical line graph of data that was collected at various station points along a pipeline. In some of the areas, there are null values for the data at a particular station or multiple stations. I would like the vertical line to stop at the null points, and continue again when there is data. (like a dashed line) Currently, the null valued data is being ignored, and a line is being drawn from the last point with data to the next point with data. I have looked all through the advanced properties of the graph, and can't find anything that will do what I need. I don't what to have to create multiple series within the graph to create this broken line.

Does anyone know how to accomplish what I need? I've attached a picture of what I need it to look like.

thanks in advance!

Re: Graphing vertical lines

DanPatterson_Retired — Fri, 07 Apr 2017 20:47:01 GMT

You have to treat each break in the dataset as a new pair of data. So split your data where a null value occurs and treat it as a pair. Implementing this depends on the format of the data of course

Re: Graphing vertical lines

PattyVogel — Mon, 10 Apr 2017 18:34:07 GMT

Thanks. That's exactly what I was hoping I didn't have to do. I just can't believe that when you create a graph, it doesn't recognize null values in data.

Re: Graphing vertical lines

DanPatterson_Retired — Sun, 12 Dec 2021 04:56:12 GMT

of course you don't have to stick with arcmap, since matplotlib is builtin.

import matplotlib.pyplot as plt
x = np.arange(10)
y = [ 1, 1, 1, 1.25, None, 1.5, 1.25, 1, 1, 1]
plt.plot(x, y, linestyle='-', marker='o')
 [<matplotlib.lines.Line2D at 0x17de70d9ac8>]

plt.show()

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yields