GNU Octave - Footnotes

# GNU Octave

## A high-level interactive language for numerical computations

## Edition 3 for Octave version 2.0.13

## February 1997

### (1)

The ``#!'` mechanism works on Unix systems derived from Berkeley Unix, System V Release 4, and some System V Release 3 systems.

### (2)

Some of Octave's function are implemented in terms of functions that cannot be called recursively. For example, the ODE solver `lsode` is ultimately implemented in a Fortran subroutine that cannot be called recursively, so `lsode` should not be called either directly or indirectly from within the user-supplied function that `lsode` requires. Doing so will result in undefined behavior.

### (3)

It would be much better to use `prod (1:n)`, or `gamma (n+1)` instead, after first checking to ensure that the value `n` is actually a positive integer.

### (4)

The ``.m'` suffix was chosen for compatibility with MATLAB.

### (5)

Yes, it's a kluge, but it seems to be a reasonably useful one.

### (6)

For example, to first sort based on the values in column 1, and then, for any values that are repeated in column 1, sort based on the values found in column 2, etc.

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