Help System (web edition)

Sums products and maxima of expressions of one or more variables
can be computed by the 'for' statement in editorial computing.
The general structure is
   <variable>=for(I=N1)to(N2)<sum|product|max|maxt>(<expression>)
or
   <variable>=for(I=N1)to(N2)term(T=A)<sum|product|max|maxt>(<expression>)

Examples:
s=for(i=1)to(100)sum(i)  s=5050
sum(N):=for(I=1)to(N)sum(1/I/I)  sqrt(6*sum(3000))=3.1412743806
factorial(N):=for(I=1)to(N)product(I)  factorial(10)=3628800
expn(X,N):=for(I=1)to(N)term(T=1)sum(T*X/I)
           N terms from the serial expansion of exp(X)-1.


  E = More information on editorial computing