Displaying two data files using Matplotlib

Question

I have two CSV files that produce a raster image, each are 300x300.

I can get the program to display one, but if I try to display both, it just produces a blank white graph. All I want it to show is the two sets of data as separate images, it does not need to be changed in any way.

import csv
import matplotlib.pyplot as plt
import math

lidar = []  # height of object
radar = []  # texture of object

with open('lidar1.csv', newline='') as f:
    reader = csv.reader(f, quoting=csv.QUOTE_NONNUMERIC)
    for row in reader:
        rowlist = []
        for value in row:
            rowlist.append(value) 
        lidar.append(rowlist)


with open('radar1.csv', newline='') as f:
    reader = csv.reader(f, quoting=csv.QUOTE_NONNUMERIC)
    for row in reader:
        rowlist = []
        for value in row:
            rowlist.append(value) 
        radar.append(rowlist)

plt.imshow(lidar)

matplotlib.org/3.1.1/api/_as_gen/matplotlib.pyplot.subplot.html — norok2
– norok2, Commented Sep 25, 2019 at 15:21
Possible duplicate of How to show two figures using matplotlib? — Bart
– Bart, Commented Sep 25, 2019 at 15:27

Callin · Accepted Answer · 2019-09-25 15:29:09Z

0

You can use plt.show to plot each figure separately:

plt.imshow(lidar) 
plt.show()
plt.imshow(radar)
plt.show()

Or do like @norok2 suggested by using subplots

fig, ax = plt.subplots(1, 2, figsize = [10, 20])
ax[0].imshow(lidar)
ax[1].imshow(radar)
plt.show()

edited Sep 25, 2019 at 15:29

answered Sep 25, 2019 at 15:25

Callin

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Comments

Philip Bal · Accepted Answer · 2019-09-25 15:19:04Z

0

You need to create 2 figures so that they display separately as so.

f1 = plt.figure()
plt.plot(lidar)
f2 = plt.figure()
plt.plot(rowlist)

answered Sep 25, 2019 at 15:19

Philip Bal

219 bronze badges

1 Comment

York77 Over a year ago

when i do that, i get two separate figures displayed as a line graph, rather than two raster images.

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