comp.lang.idl-pvwave archive - RDF feed
type: channel
description: Messages from Usenet group comp.lang.idl-pvwave, compiled by Paulo Penteado
items: Array assignment problems

Array assignment problems
type: item
description: I have a small problem here. Currently, a program I'm working on has various types of image data that read in to an array, image. Currently, image can be in the format of [m, n, o] or [o,m,n], for example, [512,512,3] or [3,512,512]. I am performing a histo stretch on individual bands in the data, like the following: IDL> print, !version { x86 Win32 Windows 5.1.1 Jul 20 1998} IDL> image = bindgen(3,512,512) IDL> displayimage = image IDL> i = 2 IDL> minthresh = 4 IDL> maxthresh = 234 IDL> displayImage[i,0,0] = BytScl(reform(image[i,*,*]), Max=maxThresh, Min=minThresh) % Out of range subscript encountered: DISPLAYIMAGE. % Execution halted at: $MAIN$ IDL> image = bindgen(512,512,3) IDL> displayimage = image IDL> displayImage[0,0,i] = BytScl(reform(image[*,*,i]), Max=maxThresh, Min=minThresh) why does the first (displayimage[i,0,0]) not work, but the second does? If I enter it as displayimage[i,*,*] =... then it works, but this is a much slower assignment. I had received the [0,0,i] = ... tip from an RSI engineer. Apparently, it is about 10x faster than doing [*,*,i] = ... I just want it to work for the other case as well! Any ideas, or is there a better, faster way? ------------------------------------------------------------ ---------- Sean P. Rumelhart Positive Systems, Inc. seanr@possys.com 250 Second St. East PH: 406.862.7745 Whitefish MT 59937 FAX: 406.862.7759 www.possys.com ------------------------------------------------------------ ---------- -----------== Posted via Deja News, The Discussion Network ==---------- http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own
creator: seanr
date: 1998-11-21T08:00:00-00:00