Ha, now I get it.
vpa function is a smart one, it regocnize pi by the first 16 digits and calculate pi to whatever digits you want.
try this:
my_pi = 3.141592653589793;
now compare:
vpa(pi,50)
and
vpa(my_pi)
Great submission. Thanks John.
I have a question on transforming a nonlinear problem to linearity:
If the nonlinear problem is of this form:
y = a* x^3
can we linearlize it as follows:
log(y) = log(a) + 3 log (x)
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