Replaced pylab (depreciated) with matplotlib.pyplot in the two allreu… #211

Job	Run time
On ubuntu-latest with (gcc-9, python-3.11, numpy-1.23)	1m 23s
On ubuntu-latest with (gcc-9, python-3.12, numpy-2.0.1)	1m 22s
On ubuntu-latest with (gcc-12, python-3.11, numpy-1.23)	1m 20s
On ubuntu-latest with (gcc-12, python-3.12, numpy-2.0.1)	1m 36s
On ubuntu-20.04 with (gcc-7, python-3.9, numpy-1.20)	1m 33s
On ubuntu-20.04 with (gcc-7, python-3.11, numpy-1.23)	1m 29s
On ubuntu-20.04 with (gcc-7, python-3.12, numpy-2.0.1)	1m 39s
On ubuntu-20.04 with (gcc-9, python-3.9, numpy-1.20)	1m 48s
On ubuntu-20.04 with (gcc-9, python-3.11, numpy-1.23)	1m 36s
On ubuntu-20.04 with (gcc-9, python-3.12, numpy-2.0.1)	1m 55s
On macos-latest with (clang, python-3.11, numpy-1.23)	1m 19s
On macos-latest with (clang, python-3.9, numpy-1.20)	1m 15s
On macos-latest with (clang, python-3.12, numpy-2.0.1)	1m 4s
	19m 19s

Provide feedback