There is a program written in Haskell called Timeplot that does this:
http://www.haskell.org/haskellwiki/Timeplot

It's an executable rather than a library, but you can use your own Haskell
code to preprocess/format data and pipe it to the program to generate
histograms as pngs.

Best,
Eric


On Sun, Jun 12, 2011 at 6:40 AM, C K Kashyap <ckkash...@gmail.com> wrote:

> You might find this useful -
> http://www.haskell.org/haskellwiki/Library/PNG
> Btw, I too am looking for such a library.
> Regards,
> Kashyap
>
> On Sat, Jun 11, 2011 at 3:32 AM, Dmitri O.Kondratiev <doko...@gmail.com>wrote:
>
>> I am looking for platform-independent library to generate simple
>> histograms in png format.
>> Does such thing exist?
>>
>> Thanks!
>>
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