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

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 and Sorting

, Pages 77-82
9 - Structures

, Pages 83-90
10 - Printing Text

, Pages 93-100
11 - interpreting Text

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

, Pages 107-114
13 - analyzing NetCDF Files

, Pages 115-125
14 - Writing NetCDF Files

, Pages 127-133
15 - techniques 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 photo 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 sort Guide

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

, Pages 271-276

, Page 277

, Pages 279-286

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

Example text

The standard was developed by the Institute of Electrical and Electronics Engineers (IEEE, pronounced I-triple-E) and is referred to as IEEE 754. Fortunately, the IEEE 754 standard has been adopted by all of the major computer manufacturers. Modern central processing units (CPUs) can usually do at least one floating-point operation (flop) per clock cycle. With current clock rates well above 1 GHz, most modern workstations and personal computers can perform more than 1 billion floating-point calculations per second (referred to as 1 gigaflop).

0, not 1. The basic IEEE floating-point type uses 32 bits (4 bytes). This is referred to as a single-precision floating-point number (FLOAT). In a single-precision floating-point number, 1 bit is used to indicate the sign of the number, 8 bits for the exponent (positive and negative), and 23 bits for the fraction. 4 × 1038 . 2 × 10−38 . Many numbers that can be written exactly with only a few decimal digits cannot be written in binary notation with a finite number of bits. 4 × 10−45 . The technical details are not of importance here.

Pro. 2. The PLOT command above uses several keyword parameters: TITLE, XTITLE, and YTITLE. These keywords are used to pass the various strings containing titles to the PLOT procedure. Because of the length of the titles, the PLOT command does not fit on a single line. In IDL the $ character is used to continue a command on the following line. Each line of the PLOT command has the continuation character ($), except the last. As the first line of the PLOT command demonstrates, you can place a comment on a line even if it is continued.

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