Hi,
> How to I define the natural logarithm in FriCAS?
It depends on what you mean. FriCAS deals with symbolics, so you can type.
(7) -> exp(log x)
(7) x
Type: Expression(Integer)
(9) -> log exp x
(9) x
So, obviously, log is the name of the natural logarith in FriCAS.
If you enter floating point numbers as argument, you get floating point
results.
(10) -> log(2.0)
(10) 0.6931471805_5994530942
> How do I draw the graph N(x)=-x^2+20x?
draw(-x^2+20*x, x=0..20)
> Is it possible to do more advanced calculations with vectors etc.?
Yes. Vectors is easy. There's even more. Look at the examples at
http://fricas.github.io/
You find plenty of examples in the FriCAS book.
http://fricas.github.io/book.pdf
Ralf
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