By Kenneth P. Bowman
In ultra-modern info age, scientists and engineers needs to fast and successfully study tremendous huge units of information. the most effective instruments to complete this is often Interactive information Language (IDLГ‚В®), a programming and visualization setting that allows numerical modeling, facts research, and photo processing. IDL's high-level language and robust photographs functions let clients to jot down extra versatile courses a lot speedier than is feasible with different programming languages. An advent to Programming with IDL allows scholars new to programming, in addition to people with event in different programming languages, to swiftly harness IDL's functions: quick, interactive functionality; array syntax; dynamic facts typing; and integrated images. every one proposal is illustrated with pattern code, together with many entire brief courses. Г‚В·Margin notes in the course of the textual content quick element readers to the appropriate sections of IDL manuals Г‚В·End-of-chapter summaries and workouts aid toughen studying Г‚В·Students who buy the booklet are eligible for a considerable on a pupil model of the IDL software program
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Additional resources for An Introduction to Programming with IDL: Interactive Data Language
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.
6. Use NaNs for missing data. 7. Write your programs so they do not generate floating-point errors unless something has gone wrong. 10 Exercises 1. Try some interactive experiments to find the largest values of x for which you can compute e x and e −x without floating-point underflow or overflow errors. Try the calculations using both single- and double-precision numbers. 2. Try some interactive experiments to find the smallest value of x for which you can compute sin(x) without floating-point underflow errors.
It is important to remember that although it is possible to write 256 (28 ) different numbers using 8 bits, because 0 is included the largest number that can be represented is 255, not 256. IDL has a built-in ability to use 8-bit binary numbers, which are known, naturally enough, as BYTE constants and variables. Using the BYTE variable type you can store 8-bit numbers and do arithmetic with them. 1 A BYTE constant is written by adding the letter B to the end of a numerical constant. Note that because there cannot be a fractional part, there is no decimal point in an integer constant.
An Introduction to Programming with IDL: Interactive Data Language by Kenneth P. Bowman