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-
-You can get more information on the expr object at
-http://www.crca.ucsd.edu/~yadegari/expr.html
-
------------
-
-New if Version 0.4
-
--access to variables (made by value object)
--multiple expression separated by ;
--added the following shorthands:
-	$y or $y1 = $y1[-1] and $y2 = $y2[-1]
--new functions:
-	if - conditional evaluation
-	cbrt - cube root
-	erf - error function
-	erfc - complementary error function
-	expm1 - exponential minus 1,
-	log1p - logarithm of 1 plus
-	isinf - is the value infinite,
-	finite - is the value finite
-	isnan -- is the resut a nan (Not a number)
-	copysign - copy sign of a number
-	ldexp  -  multiply floating-point number by integral power of 2
-	imodf -	get signed integral value from floating-point number
-	modf - get signed fractional value from floating-point number
-	drem - floating-point remainder function
-
-   Thanks to Orm Finnendahl for adding the following functions:
-	fmod - floating-point remainder function
-	ceil - ceiling function: smallest integral value not less than argument 
-	floor - largest integral value not greater than argument
-
-------------
-
-New in Version 0.3
--Full function functionality
-
-------------
-
-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.
-
-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. fexpr~ evaluates the
-expression for every single sample and at every evaluation previous
-samples (limited by the audio vector size) can be accessed. $x is used to
-denote a singnal input whose samples we would like to access. The syntax
-is $x followed by the inlet number and indexed by brackets, for example
-$x1[-1] specifies the previous sample of the first inlet. Therefore,
-if we are to build a simple filter which replaces every sample by
-the average of that sample and its previous one, we would use "fexpr~
-($x1[0]+$x1[-1])/2 ". For ease of when the brackets are omitted, the
-current sample is implied, so we can right the previous filter expression
-as follows:  " fexpr~ ($x1+$x1[-1])/2". To build IIR filters $y is used
-to access the previous samples of the output stream.
-
-The three objects expr, expr~, and fexpr~ are implemented in the same object
-so the files expr~.pd_linux and fexpr~.pd_linux are links to expr.pd_linux
-This release has been compiled and tested on Linux 6.0.
-
---------
-
-Here are some syntax information: (refer to help-expr.pd for examples)
- 
-Syntyax:
-The syntax is very close to how expression are written in
-C. Variables are specified as follows where the '#' stands
-for the inlet number:
-$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,
-	$y[n] is a shorthand for $y1[n]
-
-
-I'll appreciate hearing about bugs, comments, suggestions, ...
-
-Shahrokh Yadegari (sdy@ucsd.edu)
-7/10/02