Download An Introduction to Programming with IDL. Interactive Data by Kenneth P. Bowman PDF

By Kenneth P. Bowman

Content material:

, Pages xi-xii

, Page xiii
1 - Introduction

, Pages 3-7
2 - IDL Manuals and Books

, Pages 9-12
3 - Interactive IDL

, Pages 13-31,I
4 - IDL Scripts (Batch Jobs)

, Pages 33-38
5 - Integer Constants and Variables

, Pages 39-48
6 - Floating-Point Constants and Variables

, Pages 49-58
7 - utilizing Arrays

, Pages 59-76
8 - looking out and Sorting

, Pages 77-82
9 - Structures

, Pages 83-90
10 - Printing Text

, Pages 93-100
11 - examining Text

, Pages 101-105
12 - Writing and analyzing Binary Files

, Pages 107-114
13 - analyzing NetCDF Files

, Pages 115-125
14 - Writing NetCDF Files

, Pages 127-133
15 - approaches and Functions

, Pages 137-151
16 - software Control

, Pages 153-157
17 - Line Graphs

, Pages 161-170
18 - Contour and floor Plots

, Pages 171-179
19 - Mapping

, Pages 181-191
20 - Printing Graphics

, Pages 193-200
21 - colour and picture Display

, Pages 201-218,II-V
22 - Animation

, Pages 219-224
23 - records and Pseudorandom Numbers

, Pages 227-235
24 - Interpolation

, Pages 237-246,VI-VII
25 - Fourier Analysis

, Pages 247-262,VIII
Appendix A - An IDL variety Guide

, Pages 263-270
Appendix B - instance methods, capabilities, Scripts, and knowledge Files

, Pages 271-276

, Page 277

, Pages 279-286

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Extra info for An Introduction to Programming with IDL. Interactive Data Language

Example text

Color images can be stored using 3 bytes per pixel—one byte for red, one for green, and one for blue. Professional-quality digital imaging systems nowadays usually use more than 8 bits for each color (or channel ), but 8-bit grayscale and 24-bit color images work very well for most computer applications. 1 See the DIST, BYTSCL, and TV functions in IDL Reference Guide. A grayscale image created by using a BYTE array. 4 INT Constants and Variables Fortunately, IDL has other integer types with more than 8 bits.

1) for a set of n evenly spaced values of x between 0 and 1. That is, you want to calculate yi = sin(2πxi ), where xi = i · δx, δx = 1/(n − 1), and i = 0, 1, 2, . . , n − 1. 2) In order to compute yi , it is first necessary to compute the values of the independent coordinate xi . 00000 Remember that array subscripts use square brackets, whereas function references (such as the FLOAT function) use parentheses. Because i is explicitly converted to a FLOAT, the expression n−1 is automatically promoted to a FLOAT.

In this script, the input and output arrays x, y, and z are created. Then the time is compared for the FOR loop and the array syntax by calculating the elapsed time with the SYSTIME function. (This includes only the time to do the arithmetic operation, omitting the time required to allocate the arrays in See the SYSTIME function in IDL Reference Guide. 958165 times faster. If you run the script again, the answers will vary slightly depending on what else the computer is doing. On this computer the array syntax is almost 40 times faster than the FOR loop.

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