[Numpy-discussion] Filling gaps

[Keith Goodman]

On Thu, Feb 12, 2009 at 5:52 PM, Keith Goodman <kwgoodman@gmail.com> wrote:
> On Thu, Feb 12, 2009 at 5:22 PM, A B <python6009@gmail.com> wrote:
>> Are there any routines to fill in the gaps in an array. The simplest
>> would be by carrying the last known observation forward.
>> 0,0,10,8,0,0,7,0
>> 0,0,10,8,8,8,7,7
>
> Here's an obvious hack for 1d arrays:
>
> def fill_forward(x, miss=0):
>    y = x.copy()
>    for i in range(x.shape[0]):
>        if y[i] == miss:
>            y[i] = y[i-1]
>    return y
>
> Seems to work:
>
>>> x
>   array([ 0,  0, 10,  8,  0,  0,  7,  0])
>>> fill_forward(x)
>   array([ 0,  0, 10,  8,  8,  8,  7,  7])

I guess that should be

    for i in range(1, x.shape[0]):

instead of

    for i in range(x.shape[0]):

to avoid replacing the first element of the array, if it is missing,
with the last.