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Re: findgen([variable]) [message #22895 is a reply to message #22894]

Tue, 12 December 2000 10:33

Paul van Delst
Messages: 364
Registered: March 1997

Senior Member

"Pavel A. Romashkin" wrote:
>
> I am afraid FINDGEN can not take a vector for dimensions. What I would
> try is either using a vector
>
> x = [5, 7]
> r = findgen(total(x))
>
> which still would allow transparent indexing of R. If I really needed
> multi D arrays, I'd use EXECUTE and build a command string using
> dimensions of X:
>
> x = [5, 7]
> com = 'r = findgen('
> for i =0, n_elements(x)-1 do com = com +'x['+string(i)+']'+ $
> string(44b*byte(i ne n_elements(x)-1) > 41b)
> i=execute(com)
>
> EXECUTE is not cute, but I can't come up with anything nicer. I need
> another cup of coffe :-(

Oof!

What about

IDL> x=[5,7]
IDL> ndim=n_elements(x)
IDL> n=1L
IDL> for i=0,ndim-1 do n=n*x[i]
IDL> help, reform(findgen(n),x)
<Expression> FLOAT = Array[5, 7]
IDL> print, reform(findgen(n),x)
0.00000 1.00000 2.00000 3.00000 4.00000
5.00000 6.00000 7.00000 8.00000 9.00000
10.0000 11.0000 12.0000 13.0000 14.0000
15.0000 16.0000 17.0000 18.0000 19.0000
20.0000 21.0000 22.0000 23.0000 24.0000
25.0000 26.0000 27.0000 28.0000 29.0000
30.0000 31.0000 32.0000 33.0000 34.0000

Seems that determining "n" is the hard part...is there a "PRODUCT" type of function in IDL? Like
TOTAL but with * rather than + as the operator.

Why doesn't MAKE_ARRAY allow for a dimension vector input?

paulv

--
Paul van Delst Ph: (301) 763-8000 x7274
CIMSS @ NOAA/NCEP Fax: (301) 763-8545
Rm.207, 5200 Auth Rd. Email: pvandelst@ncep.noaa.gov
Camp Springs MD 20746

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[Message index]

		Re: findgen([variable]) By: Pavel A. Romashkin on Tue, 12 December 2000 11:50
		Re: findgen([variable]) By: John-David T. Smith on Tue, 12 December 2000 11:33
		Re: findgen([variable]) By: Paul van Delst on Tue, 12 December 2000 11:24
		Re: findgen([variable]) By: Craig Markwardt on Tue, 12 December 2000 11:07
		Re: findgen([variable]) By: Craig Markwardt on Tue, 12 December 2000 10:52
		Re: findgen([variable]) By: Paul van Delst on Tue, 12 December 2000 10:33
		Re: findgen([variable]) By: John-David T. Smith on Tue, 12 December 2000 10:20
		Re: findgen([variable]) By: Pavel A. Romashkin on Tue, 12 December 2000 09:53
		Re: findgen([variable]) By: Pavel A. Romashkin on Tue, 12 December 2000 09:45
		Re: findgen([variable]) By: Craig Markwardt on Tue, 12 December 2000 09:28

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