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3. Usage

3d ploting function z = f(x,y)

parser features:

arguments : x,y

r == sqrt( x*x + y*y )

+ - * / ( ) - no comments

|x| == abs(x)

[x] == int(x)

{x} == x - [x]

functions : sin(x), cos(x), tan(x), exp(x), ln(x), lg(x), min(x1,x2,...), max(x1,x2,...), sqr(x), sqrt(x).

samples of expression :

sin(r*r)

sin(x*x-y*y)

1/[r]

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