Re: Function arc length on 50G Message #4 Posted by Marcus von Cube, Germany on 26 Aug 2008, 3:49 a.m., in response to message #2 by George Bailey (Bedford Falls)
The 50g makes it easy to define the function yourself:
'AL(a,b,f,x)=Integral(a,b,SQRT(1+SQ(DERIV(f,x))),x)'
DEF
Substitute the words in italics by their respective symbols.
This defines the variable AL as a short program with just an arithmetic expression (the right hand side of the above equation) as its body. The function takes parameters similar to the built in symbolic integration.
You'll have to force numeric evaluation (>NUM) if you want to see numeric results.
If anybody detects a typo, please correct me.
