How to add exponential trend line to a semi logarithmic scatter plot in arcpy?

badrinathkar — Fri, 07 May 2021 14:06:35 GMT

I want to create a semi-logarithmic scatter plot and add an exponential trend line to the graph. I would also like to limit the x and y (log y) axes extent with their highest value. Also want to define the interval of the x and y axes.

I have tried with the following code

>>> import numpy as np
... import matplotlib.pyplot as plt
... fc='Yearwise'
... x= [r[0] for r in arcpy.da.SearchCursor(fc,'Year') if not r [0] is None]
... y= [r[0] for r in arcpy.da.SearchCursor(fc,'SMI') if not r [0] is None]
... ylog= np.log(y)
... plt.yscale('log')
... plt.ylim([0.1,10000])
... plt.scatter(x, ylog)
... curve_fit= np.polyfit(x,ylog,1)
... plt.show()
... print(curve_fit)

But have got the attached result (Please find the attached fig.).

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How to add exponential trend line to a semi logarithmic scatter plot in arcpy?