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Re: I have a problem with ENVI's Band Math Tool and functions written by me. [message #38140 is a reply to message #38083]

Sun, 22 February 2004 17:16

tianyf_cn
Messages: 19
Registered: November 2002

Junior Member

wl2776@yandex.ru (wl) wrote in message news:<1c9e5a19.0402190718.6cd9ec66@posting.google.com>...
> I have a function:
>
> function xlorofil, b1, b2
> if (b2 ne 0) then begin
~~~~~~~~~
ENVI regards it as a variable (not a 2-d array).

I recommend you to use WHERE function to find the subscripts of
nonzero pixels and then perform calculations.

Regard,
Tian.

> return, 0.88*(b1/float(b2))^(-2.26)
> endif else begin
> return, -2
> endelse
> end
>
> It is situated in the file in save_add directory.
> On startup idlde writes that this module was compiled successfully.
>
> When I try to use it in Band Math
>
> xlorofil(b1,b2)
>
> I get a message saying that I have entered an invalid expression.
>
> However command
>
> print, xlorofil(1,2)
>
> executed from the command line of idlde, works fine.
>
> And the expression
>
> xlorofil(b1,2)
>
> is accepted by the Band Math tool.
>
> Where is the problem?
> Why cannot I execute my funcion on two image bands?

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		I have a problem with ENVI's Band Math Tool and functions written by me. By: wl2776 on Thu, 19 February 2004 07:18
		Re: I have a problem with ENVI's Band Math Tool and functions written by me. By: tianyf_cn on Sun, 22 February 2004 17:16

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