An Introduction to Programming with IDL. Interactive Data - download pdf or read online

By Kenneth P. Bowman

ISBN-10: 012088559X

ISBN-13: 9780120885596

Content material:
Preface

, Pages xi-xii
Acknowledgments

, 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 - studying Text

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

, Pages 107-114
13 - analyzing NetCDF Files

, Pages 115-125
14 - Writing NetCDF Files

, Pages 127-133
15 - strategies and Functions

, Pages 137-151
16 - application 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 - statistics and Pseudorandom Numbers

, Pages 227-235
24 - Interpolation

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

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

, Pages 263-270
Appendix B - instance systems, services, Scripts, and knowledge Files

, Pages 271-276
Bibliography

, Page 277
Index

, Pages 279-286

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

Sample text

The range of LONG64 variables is −263 to +263 − 1 (−9,223,372,036,854,775,808 to 9,223,372,036,854,775,807, which can be handy for those occasions when you need to count really high (that’s 9 quintillion, by the way). LONG64 constants are written by appending an LL to the end of the numerals: IDL> help, 2LLˆ63−1 LONG64 = See Integer Constants in Building IDL Applications. 9223372036854775807 How long would it take to count from 0 to 263 ? 7 Converting One Integer Type to Another In some cases IDL will automatically convert one type to another.

One common way to make this mistake is to use an INT as a loop counter and then attempt to count past 32,767. There are two ways to avoid this problem. The first is to always explicitly specify that an integer constant is a 4-byte value, known as a LONG, by adding an L to the number: IDL> i = 15L IDL> help, i I LONG = 15 A lowercase l will work, but you should always use an uppercase L because the lowercase l looks very much like the numeral 1 (one). In some computer typefaces, the two are identical!

The FLTARR function creates a new floating-point array z with n elements. Recall that when an array is created, the elements of the array are set equal to zero. The FOR loop then counts from 0 to n−1 and adds the i-th elements of x and y together to get the i’th element of z. ) Subscripts are indicated by using square brackets. If you use a FOR loop, the output array z must be created ahead of time with the FLTARR statement. Although this Fortran-like approach gives the correct result, it is definitely not the best way to do this operation in IDL.

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


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