Re: getting data for Histogram
- To: mathgroup at smc.vnet.net
- Subject: [mg80487] Re: [mg80428] getting data for Histogram
- From: DrMajorBob <drmajorbob at bigfoot.com>
- Date: Thu, 23 Aug 2007 01:15:51 -0400 (EDT)
- References: <9904841.1187820731820.JavaMail.root@m35>
- Reply-to: drmajorbob at bigfoot.com
For instance...
Needs["Histograms`"]
data = RandomReal[{1, 10}, 100];
plot = Histogram@data
Cases[plot, Rectangle[{i_, _}, {j_, k_}] :> {{i, j}, k}, Infinity]
{{{1., 2.}, 11}, {{2., 3.}, 13}, {{3., 4.}, 8}, {{4., 5.},
15}, {{5., 6.}, 11}, {{6., 7.}, 11}, {{7., 8.}, 9}, {{8., 9.},
7}, {{9., 10.}, 15}}
BinCounts[data]
{11, 13, 8, 15, 11, 11, 9, 7, 15}
The match won't always be this obvious, since Histograms (without options)
chooses bin-widths adaptively.
To discover the method above, I calculated "plot" and entered
plot//FullForm
to see the histogram's storage structure.
Bobby
On Wed, 22 Aug 2007 03:44:58 -0500, <Arkadiusz.Majka at gmail.com> wrote:
> Hi,
>
> 3 years ago the following problem was given
>
> "I assume that in the process of creating a Histogram plot,
> Mathematica must be calculating a list of BinCounts -- but how can I get
> at that
> list immediately after making and displaying the histogram? "
>
> Do you know the answer?
>
> arek
>
>
>
--
DrMajorBob at bigfoot.com