I want to assign

D1:=-1/4*int((f*exp(-v*s)*(1+v*s)/v^3),0..infinity);

When I do this, it print f(x), v(x), s(x) in the integral and I don't want that...it should stay as f,v,s. Am I doing something wrong?

ElasticBeam.mw

Does anyone have any idea why I'm getting this plotting error? This should be working!!! Ahhh.