Qt platform plugin issue Rstudio

Question

I am trying to do a seaborn heatmap plot via RStudio.

I usereticulate package in R.

Below is my code:

library(reticulate)
use_condaenv("python36", conda = "auto", required = FALSE)
os <- import("os")
os$listdir(".")
py_available()


sns <- import('seaborn')
plt <- import('matplotlib.pyplot')
pd <- import('pandas')


dat <- AirPassengers
# convert time series to data frame
dat <- data.frame(matrix(dat, ncol=frequency(dat), dimnames=dimnames(.preformat.ts(dat)) ))
dat
sns$heatmap(r_to_py(dat), fmt = "g", cmap = "viridis")
plt$show()

However, I receive the following error and my R session gets aborted when it reaches the seaborn heatmap line. What should I do to fix this error?

Answer 1

I had the same problem with RStudio daily build 1.2.114 and a Anaconda Python 3.7 environment where I had PyTorch and matplotlib installed.

I followed the instructions by @Sheperd, with the following changes, pointing to the environment where you have matplotlib installed; in my case pytorch37:

import matplotlib
import matplotlib.pyplot as plt
import numpy as np

import os
os.environ['QT_QPA_PLATFORM_PLUGIN_PATH'] = 'C:/Users/user_name/Anaconda3/envs/pytorch37/Library/plugins/platforms'

t = np.arange(0.0, 2.0, 0.01)
s = 1 + np.sin(2 * np.pi * t)

fig, ax = plt.subplots()
ax.plot(t, s)

ax.set(xlabel='time (s)', ylabel='voltage (mV)',
       title='About as simple as it gets, folks')
ax.grid()

plt.show()

Now, PyQt is found and RStudio doesn't crash anymore.

Answer 2

this seems like a duplicate question. I am using RStudio-1.2.679 with R-3.4.4 to write and edit Python code. I was having the exact same problem, I tried many solutions but nothing seemed to work. Finally I found the solution here -I take absolutely no credit for it. This is, at the top of your Python code (file with extension .py) where you import libraries include:

import os
os.environ['QT_QPA_PLATFORM_PLUGIN_PATH'] = 'C:/Users/myusername/AppData/Local/Continuum/Anaconda3/Library/plugins/platforms'

Notice that is how the path looks like in my PC, it may look different in yours.

Following this example:

import matplotlib
import matplotlib.pyplot as plt
import numpy as np
import os
os.environ['QT_QPA_PLATFORM_PLUGIN_PATH'] = 'C:/Users/myusername/AppData/Local/Continuum/Anaconda3/Library/plugins/platforms'

t = np.arange(0.0, 2.0, 0.01)
s = 1 + np.sin(2 * np.pi * t)

fig, ax = plt.subplots()
ax.plot(t, s)

ax.set(xlabel='time (s)', ylabel='voltage (mV)',
       title='About as simple as it gets, folks')
ax.grid()

plt.show()

This shows the plot in the "Plots" panel in RStudio. Best wishes!