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

By Kenneth P. Bowman

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 - analyzing Text

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

, Pages 107-114
13 - studying NetCDF Files

, Pages 115-125
14 - Writing NetCDF Files

, Pages 127-133
15 - tactics 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 photo Display

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

, Pages 219-224
23 - facts and Pseudorandom Numbers

, Pages 227-235
24 - Interpolation

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

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

, Pages 263-270
Appendix B - instance methods, services, Scripts, and information Files

, Pages 271-276
Bibliography

, Page 277
Index

, Pages 279-286

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

Sample text

Other integer types that are available in IDL are described in the IDL documentation. Type BYTE INT LONG LONG64 Bits Bytes 8 16 32 64 1 2 4 8 Range (powers of 2) Minimum Maximum 0 −215 −231 −263 28 − 1 215 − 1 231 − 1 263 − 1 Range (powers of 10) Minimum Maximum 0 −32,768 ∼ −2 · 109 ∼ −9 · 1018 255 32,767 ∼ 2 · 109 ∼ 9 · 1018 Chapter 5 48 Integer Constants and Variables 32/33 33/33 33/32 −33/32 3. Assume that you want to keep track of time using units of seconds. How many years can you count before a LONG variable is unable to represent the elapsed time?

One answer is that floating-point types have their own limitations, as will be discussed in Chapter 6. 9 Exercises Unless otherwise indicated, do the following problems first without using IDL. Then, use IDL to check your answer. 1. What is the binary representation of 17? ) 2. What is the (decimal) result of the following numerical operations? 3 Commonly used integer types. Other integer types that are available in IDL are described in the IDL documentation. Type BYTE INT LONG LONG64 Bits Bytes 8 16 32 64 1 2 4 8 Range (powers of 2) Minimum Maximum 0 −215 −231 −263 28 − 1 215 − 1 231 − 1 263 − 1 Range (powers of 10) Minimum Maximum 0 −32,768 ∼ −2 · 109 ∼ −9 · 1018 255 32,767 ∼ 2 · 109 ∼ 9 · 1018 Chapter 5 48 Integer Constants and Variables 32/33 33/33 33/32 −33/32 3.

0/(n−1). IDL automatically creates the floating-point output array x to store the result. 0. They are, however, zero to within the expected precision of a single-precision floating-point number.

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