[Numpy-discussion] Numpy Nu-bee: "forward fill" function
Pierre GM
pgmdevlist@gmail....
Mon Sep 29 22:24:02 CDT 2008
On Monday 29 September 2008 22:31:47 Joshua Ford wrote:
> I would like to conduct the equivalent of a "forward fill" function on an
> array, that repeats the last non-null value until the next non-null value
> is reached. I saw that the scipy TimeSeries has a "forward_fill"
> function:
>
> http://pytseries.sourceforge.net/lib/interpolation.html
>
> I would like to do exactly what the TimeSeries "forward_fill" function does
> - but I don't have a time series.
Which is quite OK, because you don't need a time series, a simple MaskedArray
will do. For your example
>>> import numpy.ma as ma
>>> import scikits.timeseries.lib as tl
>>> a= ma.masked_values(([1,2,3,4,5,6,-999,-999,-999,-999,7,8], -999)
>>> a
masked_array(data = [1 2 3 4 5 6 -- -- -- -- 7 8],
mask = [False False False False False False True True True True
False False],
fill_value=-999)
>>> tl.forward_fill(tl)
masked_array(data = [1 2 3 4 5 6 6 6 6 6 7 8],
mask = [False False False False False False False False False False
False False],
fill_value=-999)
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