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Re: Replication question [message #45481 is a reply to message #45480]

Thu, 15 September 2005 10:53

Michael Wallace
Messages: 409
Registered: December 2003

Senior Member

> This is the "chunk indexing problem", which is covered in the
> HISTOGRAM tutorial under "Using the i-Vector". The i-vector is the
> leading portion of the reverse indices vector (the part which,
> narcissistically, indexes itself). See:
>
> http://www.dfanning.com/tips/histogram_tutorial.html
>
> It looks like this:
>
> IDL> h=histogram(total(n,/CUMULATIVE)-1,/BINSIZE,MIN=0,REVERSE_IN DICES=ri)
> IDL> i=ri[0:n_elements(h)-1]-ri[0]

My brain hurts just looking at that. I've tried to read the HISTOGRAM
tutorial before, and I didn't get very far before my grey matter became
grey goo. Maybe I'll be able to understand more now that I have a real
problem I want to solve and will be reading that in a different light.
It would be easy enough to stick that code in, but I really want to
understand what's going on. With that in mind, I have written this haiku:

Histogram horror
How can you understand it?
Thank you JD Smith

-Mike

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[Message index]

		Re: Replication question By: David Fanning on Thu, 15 September 2005 11:00
		Re: Replication question By: Michael Wallace on Thu, 15 September 2005 10:53
		Re: Replication question By: JD Smith on Wed, 14 September 2005 16:50

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