create png without show figure

Question

I built a small piece of code to plot some data.

I built it on my Oracle VirtualBox and it worked.

I moved it to production, and had the sys admin install the code and the libraries, etc.

Now the matplotlib.pyplot section is failing.

I tried a simple snippet

from matplotlib.pyplot import *
time = [0, 1, 2, 3]
position = [0, 100, 200, 300]
plt.plot(time, position)
plt.xlabel('Time (hr)')
plt.ylabel('Position (km)')

and get...

qt.qpa.screen: QXcbConnection: Could not connect to display

I don't even want to see this on the screen, I just want to create a png for a web site.

How can the code be re-written to connect to the display?

You need to use the `agg` backend if you don't want to or cannot show your figure. — ImportanceOfBeingErnest, Aug 07 '19 at 18:43
This post solved my issue! https://stackoverflow.com/questions/2801882/generating-a-png-with-matplotlib-when-display-is-undefined?rq=1 — Marinaio, Aug 08 '19 at 16:36
@ImportanceOfBeingErnest You were right, but I didn't understand you comment at the time until I found another post, thanks! — Marinaio, Aug 08 '19 at 16:37

score 1 · Accepted Answer · answered Aug 07 '19 at 18:45

1

take off the "plt." and it will work

from matplotlib.pyplot import *
time = [0, 1, 2, 3]
position = [0, 100, 200, 300]
plot(time, position)
xlabel('Time (hr)')
ylabel('Position (km)')

answered Aug 07 '19 at 18:45

Woobensky Pierre

66
6

1

I copied your code snippet. Because no X I changed plot(time, position) to savefig('./books_read.png') and still get ^Cqt.qpa.screen: QXcbConnection: Could not connect to display – Marinaio Aug 08 '19 at 16:24

create png without show figure

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