IDL Data Analysis and Visualization Applicatio.PPTVIP

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IDL Data Analysis and Visualization Applicatio.PPT

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An Introduction to IDL (The Interactive Data Language)and IDL in Astronomy I.IDL Features IDL vs. Mathematica, Matlab, Maple IDL vs. Traditional Astronomical Software IDL in Astronomy Very Good Places and Packages Working with IDL Personal SETUP for IDL (recommended) Personal IDL_STARTUP 1.edit ~/.cshrc : setenv IDL_STARTUP ~/.idl_ 2.edit ~/.idl_ (or other file names), Device, retain = 2, decomposed = 0 !path = !path + ‘:~/idlpros1:~/idlpros2’ #Windows: File ? Preferences ? Startup... you can select any file that is similar to that under Linux. II. Basics of IDL IDL PRINT, 3 * 5, [30,5,50] 15 30 5 50 IDL x = Hello! IDL World HELP, x X STRING = Hello! IDL World IDL x = indgen(15) y = sin(2*!dpi*x/15) X INT = Array[10] Y DOUBLE = Array[10] IDL FOR i = 0, 15-1 DO PRINT, i, x[i], y[i] IDL DEVICE, decomposed = 0 IDL plot, loaddata(1), psym=-4, $ title=plot, xtitle=Month, ytit=Sth‘ ;,$ ;/ylog, yrange=[5e-1,40], ystyle=1 Some Symbols, Definitions and Others IDL Variables: Dynamic Scalar, Array (1—8D) Structure: collection of scalars, arrays, or other structures System Variables (!) !dpi (3.1415926) !p: Display. e.g., !p.font, !p.color !d: Device. e.g. ! HELP, variable or HELP, variable, /struct Data type: dynamic Control Statements IF: conditional if exp then statem if exp then statem1 else statem2 For Loops: for i = init, limit, step do statem While Loops: while exp do statem Repeat Loops: repeat statem until exp Case: GOTO: goto, label Blocks: Programs: Procedures Functions Batch files: one or more IDL statements or commands. $ @batchfile: interpreted one by one, exactly as if it was from the keyboard. Main-level Programs: a series of program statements that are compiled and executed once an END statement is encountered. Programs: pro name, param1, param2, ... paramx ended with END Functions: function name, param1, param2, ... P