Few problems with ilaplace, subst and x vs X...

[dg1969]

I try to write an APP and have some troubles with theses examples :

Code:


ilaplace(1/x^2,x,'X') => X : OK
ilaplace(2,x,'X') => 2*Dirac(x) :o( small x 

even worst :

ilaplace(2*e^(-x)/x) => 2*Heaviside(x-1) : Good but...
ilaplace(2*^(-x)/x,x,'X') => 0  :o(

So I try with subst function... another way to do in two operations...

Code:


subst(2*Dirac(x),x,'X') => 2*Dirac(X) : wonderfull "big X" but...
subst(2*Heaviside(x-1),x,'X') => 0 :o(

of course in CAS and 6975 firmware.

Any idea ?