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Re: change in histogram [message #12418 is a reply to message #12410]

Wed, 29 July 1998 00:00

Liam Gumley
Messages: 473
Registered: November 1994

Senior Member

Vap User wrote:
> Has there been a change to histogram in IDl 5.1? The documentation
> says that the array is searched for the min/max values if min=/max=
> keyword are missing. However, consider the following...
[snipped some code examples]

Converting the HISTOGRAM array argument to FLOAT has helped me deal with
some strange behavior I've seen when dealing with INTEGER arguments in
IDL 5.1.

Here's what I do:

;- Get image minimum and maximum

MinValue = MIN( Image, Max = MaxValue )

;- Check image range

IF MinValue LT MaxValue THEN MESSAGE, 'Image values are all the same'

;- Define number of points used in constructing histogram

Points = 100

;- Compute histogram

HistData = HISTOGRAM( FLOAT( Image ), MIN = MinValue, MAX = MaxValue, $
BINSIZE = FLOAT( MaxValue - MinValue ) / FLOAT( Points - 1 ) )

Cheers,
Liam.

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[Message index]

		Re: change in histogram By: thompson on Wed, 29 July 1998 00:00
		Re: change in histogram By: Liam Gumley on Wed, 29 July 1998 00:00

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