python how to populate a 2D array with counter values

Question

I have initialized a 2D array (235, 451) using

grid = np.zeros((235,451))

A snippet of the array is:

a = array(Counter({(87, 177): 347, (72, 191): 335, (88, 178): 318, (68, 188): 318, (67, 188): 318, (67, 187): 314}),dtype=object)

I want to populate the following indices with the counter values and leave all the other values without a value as zero.

e.g.

>>> grid[0,0] = 0
>>> grid[87,177]=347
>>> grid[72,191]=335

My overall goal will be to then contour this over a map. Thank you.

Why is your Counter instance in an np.array in the first place? And you probably didn't initialize your grid like that... — Nils Werner
– Nils Werner, Commented Jul 13, 2017 at 17:55
Only because I'm more familiar with using numpy, so I changed the counter to a numpy array — jdiction
– jdiction, Commented Jul 13, 2017 at 17:58
You didn't change it to a numpy array, you just put it inside one (the dtype is object) — Nils Werner
– Nils Werner, Commented Jul 13, 2017 at 17:59

Nils Werner · Accepted Answer · 2017-07-13 17:59:20Z

4

Don't put your counter in an array and do

from collections import Counter
import numpy as np

a = Counter({(87, 177): 347, (72, 191): 335, (88, 178): 318, (68, 188): 318, (67, 188): 318, (67, 187): 314})
keys = np.array(list(a.keys()))
values = np.array(list(a.values()))

grid = np.zeros((235,451))
grid[keys[:, 0], keys[:, 1]] = values

answered Jul 13, 2017 at 17:59

Nils Werner

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