Introduction to Programming Using Interactive Data Language (IDL)

Interactive Data Language

By: Kenneth P Bowman

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Paperback | 14 December 2005

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In today's information age, scientists and engineers must quickly and efficiently analyze extremely large sets of data. One of the best tools to accomplish this is Interactive Data Language (IDL®), a programming and visualization environment that facilitates numerical modeling, data analysis, and image processing. IDL's high-level language and powerful graphics capabilities allow users to write more flexible programs much faster than is possible with other programming languages.

An Introduction to Programming with IDL enables students new to programming, as well as those with experience in other programming languages, to rapidly harness IDL's capabilities: fast, interactive performance; array syntax; dynamic data typing; and built-in graphics. Each concept is illustrated with sample code, including many complete short programs.

·Margin notes throughout the text quickly point readers to the relevant sections of IDL manuals

·End-of-chapter summaries and exercises help reinforce learning

·Students who purchase the book are eligible for a substantial discount on a student version of the IDL software

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Programming & Scripting Languages

Preface	p. xi
Acknowledgments	p. xiii
IDL Basics	p. 1
Introduction	p. 3
What Is IDL?	p. 3
IDL Resources	p. 4
The IDL Software System	p. 5
IDL Manuals and Books	p. 9
Features of This Book	p. 9
IDL Documentation from Research Systems	p. 10
Other IDL Books	p. 11
Interactive IDL	p. 13
IDL Commands	p. 13
Setting Up IDL	p. 13
Starting and Exiting IDL	p. 18
Interrupting and Restarting IDL Calculations	p. 19
Simple IDL Statements	p. 20
Getting Information	p. 22
Variables	p. 23
Arrays	p. 24
Graphics	p. 27
Summary	p. 30
Exercises	p. 31
IDL Scripts (Batch Jobs)	p. 33
IDL Commands and Notation	p. 33
A Note on Files and File Names	p. 33
Making a Script	p. 34
Journaling	p. 36
Summary	p. 37
Exercises	p. 38
Integer Constants and Variables	p. 39
IDL Commands and Notation	p. 39
Decimal and Binary Notation	p. 39
Byte Constants and Variables	p. 40
Int Constants and Variables	p. 44
Long Constants and Variables	p. 45
Other Integer Types	p. 46
Converting One Integer Type to Another	p. 46
Summary	p. 47
Exercises	p. 47
Floating-Point Constants and Variables	p. 49
IDL Commands and Notation	p. 49
Development of Floating-Point Methods	p. 49
Limitations of Floating-Point Arithmetic	p. 50
Single-Precision Constants and Variables	p. 51
Double-Precision Constants and Variables	p. 53
Type Conversion	p. 54
Rounding	p. 55
Infinities and Not-a-Numbers	p. 55
Summary	p. 57
Exercises	p. 58
Using Arrays	p. 59
IDL Procedures and Functions	p. 59
Creating Arrays	p. 59
Arithmetic with Arrays	p. 60
Index Arrays	p. 63
Generating a Coordinate Array	p. 64
Changing the Shape of an Array	p. 66
Using Part of an Array	p. 69
Expanding or Shrinking (Rebinning) an Array	p. 70
Reversing an Array	p. 72
Rotating or Transposing an Array	p. 74
Shifting an Array	p. 74
Summary	p. 75
Exercises	p. 75
Searching and Sorting	p. 77
IDL Procedures and Functions	p. 77
Finding Values in an Array That Satisfy a Logical Condition	p. 77
Sorting an Array	p. 79
Finding a Value in a Sorted Array	p. 80
Summary	p. 81
Exercises	p. 82
Structures	p. 83
IDL Commands and Keywords	p. 83
Named Structures	p. 83
Anonymous Structures	p. 87
Hierarchical Structures	p. 89
Additional Topics	p. 90
Summary	p. 90
Exercises	p. 90
Input and Output	p. 91
Printing Text	p. 93
IDL Commands and Keywords	p. 93
Free-Format Output	p. 93
Formatted Output	p. 95
Printing a Table	p. 97
Output to Files	p. 98
Summary	p. 99
Exercises	p. 100
Reading Text	p. 101
IDL Commands and Keywords	p. 101
Reading Text from the Terminal	p. 101
Reading Text from Files	p. 102
Summary	p. 104
Exercises	p. 105
Writing and Reading Binary Files	p. 107
IDL Commands and Keywords	p. 107
Writing Binary Files	p. 108
Reading Binary Files	p. 110
Exchanging Files with Fortran Programs	p. 113
Summary	p. 113
Exercises	p. 114
Reading NetCDF Files	p. 115
IDL Procedures and Functions	p. 115
NetCDF Basics	p. 116
Reading Attributes	p. 119
A Real Data File	p. 122
Summary	p. 124
Exercises	p. 124
Writing NetCDF Files	p. 127
IDL Procedures and Functions	p. 127
Writing a NetCDF File	p. 127
Writing Parts of an Array	p. 131
Summary	p. 132
Exercises	p. 133
Program Structure and Control	p. 135
Procedures and Functions	p. 137
IDL Commands and Keywords	p. 137
Built-in Procedures and Functions	p. 137
Writing Procedures	p. 139
Writing Functions	p. 144
Keyword Parameters	p. 147
Optional Parameters	p. 149
Summary	p. 149
Exercises	p. 150
Program Control	p. 153
IDL Commands and Keywords	p. 153
BEGIN... END Statements	p. 153
IF... THEN... ELSE Statements	p. 154
FOR Loops	p. 155
WHILE Loops	p. 156
Other Control Structures	p. 157
Summary	p. 157
Graphics	p. 159
Line Graphs	p. 161
IDL Commands for Plotting Line Graphs	p. 161
Plotting Styles	p. 161
Titles and Labels	p. 165
Axes	p. 167
Multiple Plots Per Page	p. 169
Summary	p. 170
Contour and Surface Plots	p. 171
IDL Commands and Keywords	p. 171
Contour Plots	p. 171
Surface Plots	p. 175
Shaded Surface Plots	p. 177
Summary	p. 179
Mapping	p. 181
IDL Commands and Keywords	p. 181
Drawing Maps	p. 181
Contour Plots on Maps	p. 189
Other Plots on Maps	p. 191
Summary	p. 191
Printing Graphics	p. 193
IDL Commands and Keywords	p. 193
Device Drivers	p. 193
The PostScript Device	p. 194
The PRINTER Device	p. 196
Some Limitations of the PRINTER and PS Devices	p. 200
Summary	p. 200
Exercises	p. 200
Color and Image Display	p. 201
IDL Commands and Keywords	p. 201
Color Basics	p. 201
24-Bit Devices	p. 205
8-Bit Devices	p. 215
Printing Color Output	p. 216
Summary	p. 217
Animation	p. 219
IDL Commands and Keywords	p. 219
Background	p. 219
Using XINTERANIMATE	p. 220
Summary	p. 224
Exercises	p. 224
Applications	p. 225
Statistics and Pseudorandom Numbers	p. 227
IDL Commands and Keywords	p. 227
Pseudorandom Numbers	p. 228
Basic Statistics	p. 231
Regression and Correlation	p. 233
Curve Fitting	p. 233
Significance Tests	p. 234
Summary	p. 235
Interpolation	p. 237
IDL Commands and Keywords	p. 237
Background	p. 237
1-D Interpolation	p. 237
Bilinear Interpolation	p. 239
Higher Dimensions	p. 242
Irregular Grids	p. 243
Summary	p. 246
Fourier Analysis	p. 247
IDL Commands and Keywords	p. 247
Background	p. 247
The IDL FFT	p. 252
Fourier Filtering	p. 257
Summary	p. 262
Exercises	p. 262
An IDL Style Guide	p. 263
IDL Style Rules	p. 263
Examples of Good and Bad Style	p. 266
IDL Reserved Words	p. 269
Example Procedures, Functions, Scripts, and Data Files	p. 271
Example Procedures, Functions, Scripts	p. 271
Data Files	p. 275
Bibliography	p. 277
Index	p. 279
Table of Contents provided by Ingram. All Rights Reserved.

Introduction to Programming Using Interactive Data Language (IDL)

Interactive Data Language

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