(octave.info)C-Style I/O Functions

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14.2 C-Style I/O Functions
==========================

Octave’s C-style input and output functions provide most of the
functionality of the C programming language’s standard I/O library.  The
argument lists for some of the input functions are slightly different,
however, because Octave has no way of passing arguments by reference.

   In the following, FILE refers to a filename and ‘fid’ refers to an
integer file number, as returned by ‘fopen’.

   There are three files that are always available.  Although these
files can be accessed using their corresponding numeric file ids, you
should always use the symbolic names given in the table below, since it
will make your programs easier to understand.

 -- : stdin ()
     Return the numeric value corresponding to the standard input
     stream.

     When Octave is used interactively, stdin is filtered through the
     command line editing functions.

     See also: Note: stdout, Note: stderr.

 -- : stdout ()
     Return the numeric value corresponding to the standard output
     stream.

     Data written to the standard output may be filtered through the
     pager.

     See also: Note: stdin, Note: stderr, Note:
     page_screen_output.

 -- : stderr ()
     Return the numeric value corresponding to the standard error
     stream.

     Even if paging is turned on, the standard error is not sent to the
     pager.  It is useful for error messages and prompts.

     See also: Note: stdin, Note: stdout.

Opening and Closing Files

Simple Output

Line-Oriented Input

Formatted Output

Output Conversion for Matrices

Output Conversion Syntax

Table of Output Conversions

Integer Conversions

Floating-Point Conversions

Other Output Conversions

Formatted Input

Input Conversion Syntax

Table of Input Conversions

Numeric Input Conversions

String Input Conversions

Binary I/O

Temporary Files

EOF and Errors

File Positioning