C Language, complex numbers - most common ways?

complex numbers - most common ways?

Author	Message
Phil Howa #1 / 4	complex numbers - most common ways? I am developing a set of functions to do some data manipulation of values and I personally have some need to do this with complex numbers. So I will be including them. But I do not yet have an established means of how I use complex numbers. What I would like to know is what is the most common methods, and what would be most convenient to other programmers of C programs that do or may involve complex numbers. The function I am writing builds binary trees to collect data items. If you were needing to collect and retrieve by value complex numbers, possibly associated with other data, would you tend to use structs to make the complex numbers, or just separate variables? Would calling a function to do a lookup based on a complex number be easier by one or the other of these methods (or by some way I had not considered)? 1. tree_find_complex( root , real , imaginary ); 2. complex_struct.real = real; complex_struct.imaginary = imaginary; tree_find_complex( root , complex_struct ); I have the tendency to go with the struct. But I just want to make sure that I'm not overlooking some established standards. -- -- ----------------------------- Phil Howard KA9WGN * -- -- \| Inturnet, Inc. \| Director of Internet Services \| -- -- \| Business Internet Solutions \| eng at intur.net \| -- -- ----------------------------- philh at intur.net * --
Sun, 21 Jan 2001 03:00:00 GMT

Ben Pfaf #2 / 4	complex numbers - most common ways? The function I am writing builds binary trees to collect data items. If you were needing to collect and retrieve by value complex numbers, possibly associated with other data, would you tend to use structs to make the complex numbers, or just separate variables? Would calling a function to do a lookup based on a complex number be easier by one or the other of these methods (or by some way I had not considered)? 1. tree_find_complex( root , real , imaginary ); Convenient if you often use fixed complex values. i.e., you can just call tree_find_complex (root, 1, 1) to get 1 + i. Inconvenient if you need to pass variable complex values often, because you have to use two arguments to do it in. 2. complex_struct.real = real; complex_struct.imaginary = imaginary; tree_find_complex( root , complex_struct ); The opposite caveats apply here. -- (supporter of the campaign for grumpiness where grumpiness is due in c.l.c) Please: do not email me copies of your posts to comp.lang.c do not ask me C questions via email; post them instead
Sun, 21 Jan 2001 03:00:00 GMT

Dann Corbi #3 / 4	complex numbers - most common ways? For complex numbers, you might want to consider C++ or even fortran90. Both of those put C to shame in that category. Here is the complex header documentation for complex templates in C++: http://www.dinkumware.com/htm_cpl/complex.html But, as for normal usage, you will find the struct is more common. The Cephes library at http://www.netlib.org has a bunch of complex math routines and structures already worked out for you. You might give that a look-see if you want to do it in C. -- Hypertext C-FAQ: http://www.eskimo.com/~scs/C-faq/top.html C-FAQ ftp: ftp://rtfm.mit.edu, C-FAQ Book: ISBN 0-201-84519-9 Try "C Programming: A Modern Approach" ISBN 0-393-96945-2 Want Software? Algorithms? Pubs? http://www.infoseek.com Quote: >I am developing a set of functions to do some data manipulation of values >and I personally have some need to do this with complex numbers. So I >will be including them. But I do not yet have an established means of >how I use complex numbers. What I would like to know is what is the >most common methods, and what would be most convenient to other programmers >of C programs that do or may involve complex numbers. >The function I am writing builds binary trees to collect data items. >If you were needing to collect and retrieve by value complex numbers, >possibly associated with other data, would you tend to use structs to >make the complex numbers, or just separate variables? Would calling >a function to do a lookup based on a complex number be easier by one >or the other of these methods (or by some way I had not considered)? >1. tree_find_complex( root , real , imaginary ); >2. complex_struct.real = real; > complex_struct.imaginary = imaginary; > tree_find_complex( root , complex_struct ); >I have the tendency to go with the struct. But I just want to make sure >that I'm not overlooking some established standards. >-- > -- ----------------------------- Phil Howard KA9WGN * -- > -- \| Inturnet, Inc. \| Director of Internet Services \| -- > -- \| Business Internet Solutions \| eng at intur.net \| -- > -- ----------------------------- philh at intur.net * --
Sun, 21 Jan 2001 03:00:00 GMT

Thomas O. Matthew #4 / 4	complex numbers - most common ways? The most common way to handle complex numbers is to create a structure to represent them: struct complex_num { double real; double imaginary; Quote: }; Next, write functions to perform common arithmetic and input / output using this structure. The input and output should include binary as well as ASCII formats. I suggest placing the structure in a header file along with the function prototypes and place the functions in a single file. These could be compiled and linked into a library for further use. Also, design and code your functions so that they can be used by anybody; keep the interfaces simple and general. Eliminate any and all side-effects, document the rest. Remember to test for boundary conditions and plan an error recovery scheme. By the way, there are existing libraries for using complex numbers in C. Search the web for "complex" and "C language". Try the following web sites: http://www.snippets.org http://www.shareware.com http://www.iro.umontreal.ca/%7Eratib/code/ Why reinvent the wheel? -- Thomas Matthews
Mon, 22 Jan 2001 03:00:00 GMT

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