| Re: Envi band math help! [message #35720] |
Sat, 12 July 2003 18:03  |
tianyf_cn
Messages: 19
Registered: November 2002
|
Junior Member |
|
|
If your array is not very large, I sugguest that you use IDL procedure
to print the single pilex value of b1. It a good choice to perform
math operations on each pixel of b1 by ENVI Band Math Tool.
I tested the second example, and found that ENVI first do some tests
on the specified expression. It generates a random 5*5 array to test
the math expression and then use ENVI TILE to cycle the calculation.
When you type the expression in band math tool:
example(b1)
and click the OK button, it first executes the example.pro by using
the random array(5*5).
You can set a breakpoint in you math funcion to see how it works.
Tian.
gauravjn123@yahoo.co.in (Gaurav) wrote in message news:<d193b5fb.0307110209.5ab0ce0c@posting.google.com>...
> Hi!
> I have this strange problem...i have written one band math function
> to print the band value at the location 30,30 but it doesnt work. And
> the same function if written for location 4,4 ...works fine! Here are
> the functions:
>
> 1.function example,b1
> help,b1
> print,b1(30,30)
> end
> 2.function example,b1
> help,b1
> print,b1(4,4)
> end
> And strangely enuf...in the second example, the value b1(4,4)
> is printed 4 times & the value printed final time is the right
> value. The help command outputs that the array is of size[5,5] in the
> initial 3 times. Only after that in the final turn does it output the
> right dimesnions that is 608*673
>
> Could anyone please enlighten me....it has been bugging me for many
> days!
> Thnx in advance
>
> Gaurav
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
