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- %FPRINTF Write formatted data to file.
- % COUNT = FPRINTF(FID,FORMAT,A,...) formats the data in matrix A (and in
- % any additional matrix arguments), under control of the specified FORMAT
- % string, and writes it to the file associated with file identifier FID.
- % COUNT is an optional output argument that returns the number of bytes
- % successfully written.
- %
- % FID is an integer file identifier obtained from FOPEN. It can also
- % be 1 for standard output (the screen) or 2 for standard error.
- %
- % FORMAT is a string containing C language conversion specifications.
- % Conversion specifications involve the character %, optional flags,
- % optional width and precision fields, optional subtype specifier, and
- % conversion characters d, i, o, u, x, X, f, e, E, g, G, c, and s.
- % See a C manual for complete details.
- %
- % FPRINTF behaves like ANSI C with certain exceptions and extensions.
- % These include:
- %
- % 1. If the MATLAB double doesn't convert exactly to the datatype
- % associated with the conversion specifier then e format is used.
- % You must explicitly convert non-integral MATLAB values to
- % integral values if you plan to use an integral conversion
- % specifier like d and get the expected ANSI C behavior.
- % 2. The following non-standard subtype specifiers are supported for
- % conversion characters o, u, x, and X.
- %
- % t - The underlying C datatype is a float rather than an
- % unsigned integer.
- % b - The underlying C datatype is a double rather than an
- % unsigned integer.
- %
- % For example, to print out in hex a double value use a format like
- % '%bx'.
- %
- % FPRINTF also differs from its C language namesake in an important
- % respect - it is "vectorized" for the case when A is nonscalar. The
- % format string is recycled through the elements of A (columnwise) until
- % all the elements are used up. It is then recycled in a similar manner,
- % without reinitializing, through any additional matrix arguments.
- %
- % For example, the statements
- %
- % x = 0:.1:1; y = [x; exp(x)];
- % fid = fopen('exp.txt','w');
- % fprintf(fid,'%6.2f %12.8f\n',y);
- %
- % create a text file containing a short table of the exponential function:
- %
- % 0.00 1.00000000
- % 0.10 1.10517092
- % ...
- % 1.00 2.71828183
- %
- % See also FSCANF, SPRINTF, FWRITE, DIARY, SAVE.
-
- % Copyright (c) 1984-93 by The MathWorks, Inc.
- % Built-in function.
-