How can I change the python matplotlib.pyplot legend marker into a serial number like 1,2,3 instead of shape or character?

Question

import matplotlib.pyplot

plt.figure() 
plt.plot(x, 'r+', label='one')
plt.plot(x1, 'go--', label ='two')
plt.plot(y, 'ro', label='Three')
plt.legend()

In the above code legend marker is 'r+' , 'go--' and 'ro' but I want it to change into 1,2 and 3 as there are 3 plots.? Can anyone help me in solving this issue? Also is there any anyway it can be done without hardcoding the numbers? """ Thank you.

mozway · Accepted Answer · 2021-10-03 17:33:12Z

0

You could use a generator (e.g., itertools.count) and next:

import matplotlib.pyplot

x=x1=y=(0,0) # dummy data

markers = iter(['r+', 'go--', 'ro'])

plt.figure() 
plt.plot(x, next(markers), label='1')
plt.plot(x1, next(markers), label='2')
plt.plot(y, next(markers), label='3')
plt.legend()

output:

edited Oct 3, 2021 at 17:33

answered Oct 3, 2021 at 17:02

mozway

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7 Comments

daspran Over a year ago

Actually I am trying to change the marker of the legend, i.e. the red plus sign, green one and the red dot. Not the labels of the legend.

mozway Over a year ago

@daspran oops sorry, but how do you want to iterate over the values? random? manual custom order?

daspran Over a year ago

As per the plotting sequence. Suppose I plot a bar char with 3 different variables then the 1st marker will be 1st bar. 2nd marker will be 2nd bar and so on. Instead of the color of the bars I want it numbered sequentially as plotted. How can I do it? any suggestion please

mozway Over a year ago

Sorry but not clear to me, markers are not numbers, can you provide a schematic?

daspran Over a year ago

Yes, as markers are not numbers can I change those into numbers? Like > 1 RED CROSS 2. GREEN LINE 3 RED DOT

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