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Create three populations of iaf_psc_alpha neurons on a 4x3 grid, each with different center

BCCN Tutorial @ CNS*09 Hans Ekkehard Plesser, UMB

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

for ctr in [(0.0, 0.0), (-2.0, 2.0), (0.5, 1.0)]:
    plt.figure()
    nest.ResetKernel()

    l1 = nest.Create('iaf_psc_alpha',
                     positions=nest.spatial.grid(shape=[4, 3], extent=[2., 1.5],
                                                 center=ctr))

    nest.PlotLayer(l1, nodesize=50, fig=plt.gcf())

    # beautify
    plt.axis([-3, 3, -3, 3])
    plt.axes().set_aspect('equal', 'box')
    plt.axes().set_xticks(np.arange(-3.0, 3.1, 1.0))
    plt.axes().set_yticks(np.arange(-3.0, 3.1, 1.0))
    plt.grid(True)
    plt.xlabel(f'4 Columns, Extent: 1.5, Center: {ctr[0]:.1f}')
    plt.ylabel(f'2 Rows, Extent: 1.0, Center: {ctr[1]:.1f}')

    plt.show()
    # plt.savefig('grid_iaf_oc_{}_{}.png'.format(ctr[0], ctr[1]))