Re: Calculating CDFs from PDFs

[Joe Koski]

on 9/1/04 2:02 PM, Jonathan C. Webster at address@hidden wrote:

> try cumsum()
> Jonathan
> 
Thanks, that works and is MatLab compatible as well.

Joe

> Joe Koski wrote:
>> With the octave hist function, I'm calculating approximate probability
>> density functions for some experimental data, and it is working well.
>> 
>> To get the cumulative distribution function from the probability
>> distribution, I reverted to my Fortran roots and wrote
>> 
>> % calculate cdf from pdf
>>   sum_pdf=0;
>>   for i = 1:num_bins
>>     sum_pdf=sum_pdf+pdf(i);
>>     cdf(i)=sum_pdf;
>>   end
>> 
>> which also works well.
>> 
>> Question: is there a way of calculating cdf without resorting to the for
>> loop? The for loop approach seems very un-octave to me.
>> 
>> Obviously, this is not urgent, but perhaps educational.
>> 
>> Joe
>> 
>> 
>> 
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> 



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