files_multiple_test, a MATLAB code which demonstrates how a program can open multiple output files at one time, and write data to any one specific file it chooses.
To write data to a file, a MATLAB code needs a filename, an fopen() statement that assigns a unique unit number to that filename, and fprintf() statements that send data to the file identified by unit number.
To handle two or three files is easy, but to handle an arbitrary number of files requires a little planning.
Supposing we need "n" files, we can create a "template" filename with some zeros in it, like "file00.txt", and call a function like "filename_inc()" which, each time, will return a filename with the numeric text incremented by 1:
file01.txt file02.txt file03.txt ...
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
files_multiple_test is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version.
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test01() counts from 0 to 100. Each divisor of 2 is written to "divisor1.txt", each divisor of 3 is written to "divisor2.txt" and so on.
test02() watches a vector X, of length 100, as it changes 20 times.