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There is NO TRUTH! Re: Histogram Hot-shots Required [message #16362 is a reply to message #16297]

Mon, 19 July 1999 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Folks,

More evidence that the apocalypse is upon us....

Here are five different methods for calculating the
histogram bin number from a value:

; Liam's method 1:

binNum1 = FLOOR((value - Min(array)) / binsize)

; Liam's method 2:

binNum2 = ROUND((value - Min(array)) / binsize)

; Liam's method 3:

binNum3 = CEIL((value - Min(array)) / binsize)

; Eddie's method:

binNum4 =(where(R ge ((where(((where(array eq value))[0]) eq $
R[R[0]:*]))[0]+R[0])))[0]

; My brute-force, no-excuses method:

FOR j=0,N_Elements(bins)-2 DO BEGIN
IF value GT bins[j] and value LT bins[j+1] THEN BEGIN
binNum5 = j
goto, getout
ENDIF
ENDFOR
getout:

Here is typical output of this print statement:

Print, binNum1, binNum2, binNum3, binNum4, binNum5

34 35 35 35 34
11 12 12 12 11
11 11 12 12 11
13 13 14 14 13
2 3 3 3 2
10 11 11 11 10
12 12 13 13 12
28 28 29 29 28
26 27 27 27 26
33 34 34 34 33
34 35 35 35 34
32 33 33 33 32

Notice that method 1 and method 5 always produce the same
number. Whew! It may be brute-force, but I can explain it
and I am SURE it is right!

But, woe of woes, here is the graphical output for the last
value:

http://www.dfanning.com/images/histogram.jpg

Not even close. :-(

The best graphical values are STILL method 3.

HELP!!!!!

Cheers,

David

P.S. Let's just say my confidence in rational thought is slipping...

Of course, I'm listening to my Bob Marley CD, so that may have
something to do with it :-)

--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Histogram Hot-shots Required By: davidf on Thu, 15 July 1999 00:00
		Re: Histogram Hot-shots Required By: Liam Gumley on Tue, 20 July 1999 00:00
		Re: Histogram Hot-shots Required By: Martin Downing on Tue, 20 July 1999 00:00
		There is NO TRUTH! Re: Histogram Hot-shots Required By: davidf on Mon, 19 July 1999 00:00
		Re: There is NO TRUTH! Re: Histogram Hot-shots Required By: davidf on Wed, 21 July 1999 00:00
		Re: There is NO TRUTH! Re: Histogram Hot-shots Required By: gabriel rodriguez ibe on Wed, 21 July 1999 00:00
		Re: Histogram Hot-shots Required By: davidf on Mon, 19 July 1999 00:00
		Re: Histogram Hot-shots Required By: eddie haskell on Fri, 16 July 1999 00:00

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