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Cannot determine expression

Johan 16
April 28 2006
0
Hello.

Can anybody explain me please this error? Thanx :-)

Error, cannot determine if this expression is true or false:

-2.500000000*exp(0.) <= -1.675000000


Program:

> restart:
> with(linalg):
> with(plots):
> with(DEtools):
> with(inttrans):
# Warning, the protected names norm and trace have been redefined and
# unprotected
# Warning, the name changecoords has been redefined
# Warning, the previous binding of the name adjoint has been removed
# and it now has an assigned value
# Warning, the previous binding of the name hilbert has been removed
# and it now has an assigned value
> Gp:=2.5/(8*s^2+6*s+1):
> Td:=1.5:
> A:=0:
> y:=4.91:
> Y:=Gp:
> Y:=Y/s;
> Y:=invlaplace(Y,s,t);

> for k from 0 by 0.01 while A<=y033 do
> A:=subs(t=k,Y):
> od:
> t033:=k-0.01+Td:
2.5
Y := ------------------
/ 2 \
\8 s + 6 s + 1/ s
Y := 2.500000000 + 2.500000000 exp(-0.5000000000 t) - 5. exp(-0.2500000000 t)

# Error, cannot determine if this expression is true or false: 0 <= y033
programming

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