By Kenneth P. Bowman

ISBN-10: 012088559X

ISBN-13: 9780120885596

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 examining Binary Files

, Pages 107-114
13 - examining NetCDF Files

, Pages 115-125
14 - Writing NetCDF Files

, Pages 127-133
15 - strategies 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 snapshot 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, capabilities, Scripts, and knowledge Files

, Pages 271-276

, Page 277

, Pages 279-286

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

Sample text

Here is an example. 0000 See the TOTAL function in IDL Reference Guide. 00000 Next, we replace one of the values in the array by a NaN to represent a missing observation. Conveniently, IDL has built-in constants containing the special IEEE values. VALUES. EXCEPT = 2 and rerun your calculation. That will cause IDL to report errors, if any, immediately after they occur. See System Variables in Building IDL Applications. VALUES is actually a structure that contains four separate values: NaNs and Infs for both single- and double-precision types.

6 Type Conversion IDL has built-in functions to convert between different numerical types: See Type Conversion Functions in Building IDL Applications. 0000000 When a FLOAT or DOUBLE is converted to a LONG, the fractional part is thrown away (like integer division). 8 Infinities and Not-a-Numbers 55 That is, the LONG variable i is converted to a FLOAT or a DOUBLE before the multiplication is carried out. If you must do mixed-type arithmetic, it is a good idea to explicitly convert the types to be sure that the calculation is carried out the way you want.

100 × 10−99 . These are referred to as normalized numbers. 001 × 10−99 , which would be a denormalized form. Generally, IEEE floating-point numbers are stored in normalized form. Note that the rational number 1/3 cannot be stored exactly because it is an infinitely repeating decimal number. The floating-point representation of 1/3 must be rounded to three significant digits. 999 × 100 , not 1. 1 Some floating-point numbers in decimal notation with three-digit precision. 4 Single-Precision Constants and Variables 51 an operation does not return the original value.

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

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