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Re: Function Maximum [message #35491 is a reply to message #35487]

Thu, 19 June 2003 08:02

Benjamin Panter
Messages: 6
Registered: August 2002

Junior Member

Reimar Bauer wrote:
> Kate wrote:
>
>
>> If I have a function definition, say it is
>>
>> FUNCTION MYGAMMA, X, P
>> RETURN, P[0]*(X^P[1])*EXP(-1*X/P[2])
>> END
>>
>> Where P holds my fit parameters that are already determined.
>>
>> If I want to find a local maximum in a certain range is it possible to
>> do this with an existing written IDL function?
>
>
> What's with MAX()

<hopping out from lurking for a moment>

I think that Kate is asking to find the maximum of an expression rather
than the maximum of an array.

An inelegant solution that might work is to evaluate the funtion in the
range of interest to as high a precision as is computationally possible
- and then run MAX() on it - but there must be a nicer way? I think this
method will fall down if there is a very sharp global max but a wider
local max

Apologies for not being much of a mathematician and failing to provide a
better way!

<back to lurking & learning...>

Ben

--
Ben Panter, Edinburgh
My name (no spaces)@bigfoot which is a com.

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[Message index]

		Re: Function Maximum By: faeriepunk on Fri, 20 June 2003 06:25
		Re: Function Maximum By: Paul Van Delst[1] on Thu, 19 June 2003 14:06
		Re: Function Maximum By: R.Bauer on Thu, 19 June 2003 12:55
		Re: Function Maximum By: Haje Korth on Thu, 19 June 2003 11:48
		Re: Function Maximum By: James Kuyper on Thu, 19 June 2003 10:10
		Re: Function Maximum By: Craig Markwardt on Thu, 19 June 2003 09:50
		Re: Function Maximum By: James Kuyper on Thu, 19 June 2003 09:27
		Re: Function Maximum By: Benjamin Panter on Thu, 19 June 2003 08:02
		Re: Function Maximum By: Craig Markwardt on Thu, 19 June 2003 07:45
		Re: Function Maximum By: R.Bauer on Thu, 19 June 2003 07:44

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