expr, expr~, fexpr~

[Shahrokh Yadegari]

Hi,

Two new objects expr~ and fexr~, which are extensions of expr:

You can obtain a version from:

http://crca.ucsd.edu/~syadegar/expr-01-linux.tar.gz

This version has a number of expr bug fixes as well.
I'll appreciate hearing about bugs, comments, suggestions, etc.

Shahrokh Yadegari (sdy at ucsd.edu)

Here is the README file:
------------------------

The object "expr" is used for expression evaluaion of control data.

Expr~ and fexpr~ are extentions to the expr object to work with vectors.
The expr~ object is designed to efficiently combine signal and control
stream processing by vector operations on the basis of the block size of
the environment.
NOTE: Functions in expr~ do not support vectors yet.  I am working on
that.

The fexpr~ object provides a flexible mechanism for building FIR and IIR
filters by evaluating expressions on a sample by sample basis and
providing access to prior samples of the input and output audio streams.
When fractional offset is used, fexpr~ uses linear interpolation to
determine the value of the indexed sample.


The three objects expr, expr~, and fexpr~ are implemented in the
same object so the files expr~.pd_linux and fexpr~.pd_linux are links to
expr.pd_linux

--------

Here are some syntax information: (refer to help-expr.pd for examples)

Syntyax:
The syntax is very close to how expression are written in
C. Variables are specified as follows where the '#' stands
for the inlet number:
$i#: integer input variable
$f#: float input variable
$s#: symbol input variable

Used for expr~ only:
$v#: signal (vector) input (vector by vector evaluation)

Used for fexpr~ only:
$x#[n]: the sample from inlet # indexed by n, where n has to
	satisfy 0 => n >= -vector size,
	($x# is a shorthand for $x#[0], specifying the current sample)

$y[n]: the output value indexed by n, where n has to
	satisfy 0 > n >= -vector size,