In a message dated 1/20/2009 9:05:58 P.M. Eastern Standard Time,
wdjoy...@gmail.com writes:
sage: t = var('t')
sage: x = function('x',t)
sage: DE = lambda y: diff(y,t,t) + y
sage: f = eval(desolve_laplace(DE(x(t)), ["t","x"], [0,1,0]))
sage: f(t)
cos(t)
OK, I saw this in the DiffEqu text, but I must say that the syntax is a bit
confusing.
I suppose x = funxtion('x',t) means x=f(t)
and diff(y,t,t) means y'' but why?
Can't we use diff(y,t,2)? Where does the diff(y,t,t) syntax come from?
TIA,
A. Jorge Garcia
calcp...@aol.com
http://calcpage.tripod.com
Teacher & Professor
Applied Mathematics, Physics & Computer Science
Baldwin Senior High School & Nassau Community College
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