Python: Numpy accumulated list not seperated by commas

Question

Simple example: I got a list called 'mylist' and I want to accumulate the numbers inside and save them into a new list called 'mylist_accum'.

import numpy

mylist = [1,2,3,4,5]
print mylist

mylist_accum = numpy.add.accumulate(mylist)
print mylist_accum

My prints look like this:

[1, 2, 3, 4, 5]
[ 1  3  6 10 15]

And I want them to look like this:

[1, 2, 3, 4, 5]
[1, 3, 6, 10, 15]

I need my accumulated listelements to be seperated by commas. Otherwise Matplotlib cant work with them.

Matplotlib handles numpy arrays (which your `mylist_accum` is) just fine. What makes you think otherwise? — Hannes Ovrén, Nov 19 '15 at 11:59

score 2 · Accepted Answer · answered Nov 19 '15 at 12:30

2

It's just printing, matplotlib could handle with the numpy.arrays easy:

In [77]: type(mylist_accum)
Out[77]: numpy.ndarray

If you want to see with commas you could use .tolist method of the numpy.array:

In [75]: mylist_accum.tolist()
Out[75]: [1, 3, 6, 10, 15]

Or convert it to usual list:

In [74]: list(mylist_accum)
Out[74]: [1, 3, 6, 10, 15]

answered Nov 19 '15 at 12:30

Anton Protopopov

1

`list()` does not handle 2d (or higher nd) arrays well. `tolist()` is more consistent. – hpaulj Nov 19 '15 at 17:22

1 Answers1