prctile not interpolating

I would like to find percentiles, with interpolation where needed, but the matplotlib prctile seems to be different to matlab in this respect:

In [1]: x = array([ 3.0, 5.0, 7.0, 8.0, 9.0, 11.0 ])

In [2]: median(x)
Out[2]: 7.5

In [3]: prctile(x,50)
Out[3]: 8.0

is there a function available which does include interpolation, or should I just write my own? (I'd also like 10th and 90th percentiles for example).

Thanks, Dave

You can use the scipy version:

~|[10]>from scipy.stats import stats
~|[11]>stats.scoreatpercentile(x,50)

Out [11]:7.5

···

Le vendredi 28 mars 2008, David Simpson a écrit :

I would like to find percentiles, with interpolation where needed, but
the matplotlib prctile seems to be different to matlab in this respect:

In [1]: x = array([ 3.0, 5.0, 7.0, 8.0, 9.0, 11.0 ])

In [2]: median(x)
Out[2]: 7.5

In [3]: prctile(x,50)
Out[3]: 8.0

is there a function available which does include interpolation, or
should I just write my own? (I'd also like 10th and 90th percentiles for
example).

Thanks, Dave

-------------------------------------------------------------------------
Check out the new SourceForge.net Marketplace.
It's the best place to buy or sell services for
just about anything Open Source.
http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplac
e _______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

--
Lionel Roubeyrie - lroubeyrie@...1068...
Chargé d'études et de maintenance
LIMAIR - la Surveillance de l'Air en Limousin
http://www.limair.asso.fr