function inversion



Hi,

I defined a function giving a set of points with linearinterpol then I added 
another function, which I defined with a simple formula. The resulting 
function is still strictly rising in value, so mathematically it can be 
inverted, so I wanted to invert the function, but I could not find an 
operator for that anywere, I tried

simplify([y=f(x)],x), which produced some expression, but not what I needed 
and funcsimplify([y=f(x(y)),x(y)), which failed (division by zero).

Is there a standard way to do this ? it seems something pretty basic.

for any help I would be very grateful,

Stefan