>;) IDL>x=findgen(100)
>;) IDL>print,minmax(x)
% Compiled module: MINMAX.
      0.00000      99.0000
>;) IDL>plot,x         
>;) IDL>xsin=x/(max(x))
>;) IDL>xsin=x/(max(x))*(2*!pi)
>;) IDL>xsin=x/(max(x))*(2*!dpi)
>;) IDL>plot,xsin
>;) IDL>ysin=sin(xsin)
>;) IDL>plot,xsin,ysin
>;) IDL>ysin=sin(xsin*3)
>;) IDL>plot,xsin,ysin  
>;) IDL>save,xsin,ysin,file='sine.sav'
>;) IDL>restore,'sin.sav',/ver
% RESTORE: Error opening file. Unit: 100, File: sin.sav
  No such file or directory
% Execution halted at: $MAIN$          
>;) IDL>restore,'sine.sav',/ver
% RESTORE: Portable (XDR) SAVE/RESTORE file.
% RESTORE: Save file written by phiggins@eo, Wed Feb 13 18:34:38 2008.
% RESTORE: IDL version 6.3 (linux, x86).
% RESTORE: Restored variable: XSIN.
% RESTORE: Restored variable: YSIN.
>;) IDL>restore,'sun.sav',/ver
% RESTORE: Error opening file. Unit: 100, File: sun.sav
  No such file or directory
% Execution halted at: $MAIN$          
>;) IDL>restore,'sun.sav',/ver
% RESTORE: Portable (XDR) SAVE/RESTORE file.
% RESTORE: Save file written by phiggins@phobos, Wed Feb 13 16:29:50 2008.
% RESTORE: IDL version 6.3 (linux, x86).
% RESTORE: Restored variable: SUN.
>;) IDL>help,sun
SUN             BYTE      = Array[1024, 1024]
>;) IDL>tv,sun
>;) IDL>tvscl,sun
>;) IDL>display,sun
% Compiled module: DISPLAY.
% Compiled module: IMGEXP.
% DISPLAY: <Image> is already byte type. No scaling done.
>;) IDL>window,xs=600,ys=600
>;) IDL>display,sun
% DISPLAY: <Image> is already byte type. No scaling done.
>;) IDL>device,decomp=0
>;) IDL>loadct,3
% Compiled module: LOADCT.
% Compiled module: FILEPATH.
% Compiled module: PATH_SEP.
% LOADCT: Loading table RED TEMPERATURE
>;) IDL>display,sun
% DISPLAY: <Image> is already byte type. No scaling done.
>;) IDL>loadct,40  
% LOADCT: Loading table Rainbow + black
>;) IDL>display,sun
% DISPLAY: <Image> is already byte type. No scaling done.
>;) IDL>loadct,3   
% LOADCT: Loading table RED TEMPERATURE
>;) IDL>display,sun
% DISPLAY: <Image> is already byte type. No scaling done.
>;) IDL>print,minmax(sun)
   0 255
>;) IDL>display,sun >200
% Compiled module: IMGSCL.
>;) IDL>display,sun < 200
>;) IDL>print,total(sun)
  1.27978e+08
>;) IDL>print,mean(sun)
% Compiled module: MEAN.
% Compiled module: MOMENT.
      122.050
>;) IDL>sun=reverse(sun)
% Compiled module: REVERSE.
>;) IDL>display,sun
% DISPLAY: <Image> is already byte type. No scaling done.
>;) IDL>x=findgen(10)
>;) IDL>print,reverse(x)
      9.00000      8.00000      7.00000      6.00000      5.00000      4.00000
      3.00000      2.00000      1.00000      0.00000
>;) IDL>print,sort(x)
           0           1           2           3           4           5
           6           7           8           9
>;) IDL>print,x[sort(x)]
      0.00000      1.00000      2.00000      3.00000      4.00000      5.00000
      6.00000      7.00000      8.00000      9.00000
>;) IDL>print,rebin(x,20)
      0.00000     0.500000      1.00000      1.50000      2.00000      2.50000
      3.00000      3.50000      4.00000      4.50000      5.00000      5.50000
      6.00000      6.50000      7.00000      7.50000      8.00000      8.50000
      9.00000      9.00000
>;) IDL>print,rebin(x,20,/sample)
      0.00000      0.00000      1.00000      1.00000      2.00000      2.00000
      3.00000      3.00000      4.00000      4.00000      5.00000      5.00000
      6.00000      6.00000      7.00000      7.00000      8.00000      8.00000
      9.00000      9.00000
>;) IDL>sz=size(sun)
>;) IDL>print,sz
           2        1024        1024           1     1048576
>;) IDL>sz=size(sun, sz[1]/4,sz[2]/4)

sz=size(sun, sz[1]/4,sz[2]/4)
                             ^
% SIZE: Incorrect number of arguments.
>;) IDL>display,rebin(sun, sz[1]/4,sz[2]/4)
% DISPLAY: <Image> is already byte type. No scaling done.
>;) IDL>tvscl,rebin(sun, sz[1]/4,sz[2]/4)
>;) IDL>tvscl,rebin(sun, sz[1],sz[2])