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Commit 79004bb5 authored by Michele Maris's avatar Michele Maris
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def nearly_even_split(idx,nblocks,strict=False) :
""" splits a list of indexes idx into nblocks
if len(idx) can not be integer divided into nblocks
a further, shorter block is appended to accomodate the remainder samples
keyword: strict
if True the array the remainder is appended at the last block
Example:
x=np.arange(113)
out=nearly_even_split(x,7)
print(len(out))
> 8
# this is a test to check proper partition
print(abs(np.concatenate(out)-x).ptp())
> 0
print(out)
[array([ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]),
array([16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31]),
array([32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47]),
array([48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63]),
array([64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79]),
array([80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95]),
array([ 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108,
109, 110, 111]),
array([112])]
V 1.0 - 2023 Jan 12 - M.Maris
"""
#
import numpy as np
#
rembloc=int(np.mod(len(idx),nblocks))
if strict and rembloc > 0 and nblocks>1:
rembloc=np.mod(len(idx),nblocks-1)
dblock=len(idx)//(nblocks-1)
EVEN=dblock*(nblocks-1)
out=list(np.split(idx[:EVEN],(nblocks-1)))
if rembloc > 0 :
out.append(idx[EVEN:])
else :
dblock=len(idx)//nblocks
EVEN=dblock*nblocks
out=list(np.split(idx[:EVEN],nblocks))
if rembloc > 0 :
out.append(idx[EVEN:])
return out
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