Re: fixed bin width

Just to repeat what I said in my previous mail: what you do by hand, is done automatically by
the auto binning algorithm and in addition you get nice values for the bin width and boundaries.

Rene Brun

John wrote:
> OK, get it ... what I have done in the past is to maintain the values
> that I am going to use to fill my histogram in a data structure (a
> simple array for example). Then I figure my limits and proper binning.
> It is only at the very end that I define the histogram and procced to
> fill it up from the array. I don't know if you like this idea. If you
> need an example let me know.
>
> Did you noticed that TH1F::Fill(Double_t x) returns -1 when you enter a
> value out of range ? That helps you out detecting when you are filling
> out of the defined range.
>
> cheers,
>
> John Idarraga
> UMontreal
>
> Adrian Sevcenco wrote:
>
>> Àstrid Morreale wrote:
>>
>>> you could use a tree instead of a Histogram, I think I tree is more
>>> flexible in that regard.
>>>
>> Very true ... this was my first thought and intention .. but i just
>> wanted to ask about this ... it would simplify some quick things that
>> sometime one have to do ...
>> Thanks,
>> Best regards,
>> Adrian
>>
>>
>>> Adrian Sevcenco ha scritto
>>> <°> John wrote:
>>> <°>> I don't understand your question yet ... when you define a
>>> histogram,
>>> <°>> you have a fixed number of bins already. When you say " ... keep
>>> <°>> scaling the axis range automatically as it is filled ... " you
>>> mean the
>>> <°>> y axis ?
>>> <°>>
>>> <°>> regards,
>>> <°>>
>>> <°>> John Idarraga
>>> <°>> UMontreal
>>> <°> Well ... my wish is just to define a histogram with lets say 1 bin
>>> with
>>> <°> the bin width = 1 ... and if i fill with, lets say 15,
>>> automatically the
>>> <°> histogram will resize to have 16 bins with range extended up to
>>> value 16...
>>> <°> well... if its too far fetched i will just cope with what i have ...
>>> <°> Best regards,
>>> <°> Adrian
>>> <°>
>>> <°>> Adrian Sevcenco wrote:
>>> <°>>> Hi,
>>> <°>>> Is there a possibility of setting up a histogram with a fixed
>>> bin width
>>> <°>>> that will keep scaling the axis range automatically as it is
>>> filled?
>>> <°>>> Thank you,
>>> <°>>> Best regards,
>>> <°>>> Adrian
>>> <°>>>
>>> <°>>>
>>> <°>>
>>> <°>
>>>
>>>
>>> -Àstrid
>>>
>>> ===============================================
>>> http://www.phenix.bnl.gov/~astrid/
>>> ================================================
>>> Àstrid Morreale
>>> University Of California_at_Riverside
>>> PHENIX SPIN Physics Group
>>> http://www.phenix.bnl.gov/phenix/WWW/physics/spin/
>>> E-mail: astrid_at_bnl.gov |Tel(BNL):631-344-7266
>>> |Fax(BNL):631-344-3253
>>> A_A
>>> (-.-)
>>> |-|
>>> / \
>>> | | __
>>> | || | | \_/
>>> \_||_/_/
>>> ¯`·.¸.·´¯`·.¸.·´¯`·.><((((º>
>>> ===============================================
>>> Vidi ch'un s'affaccia quacchi fungi!!!!!
>>>
>
>
Received on Tue Jul 08 2008 - 16:34:43 CEST