Online Algebra Calculator
Many of users do not use powerful Maxima computer algebra system for systematic work, but for ad hoc algebraic calculations – equations, functions, matrixes, etc. only. To do this job, it is not useful to download the whole application from a web site.
Function: num (<expr>) Returns the numerator of <expr> if it is a ratio. If <expr> is not a ratio, <expr> is returned.
![Num Example N: 2;
num(sum(a[2*ii]*((1+z)/(2*(1-z)))^(2*ii),ii,0,N));](http://maxima-online.org//plot.html?g=i-747403380.png&t=img&db=r-1034920878)
num evaluates its argument.
There are also some inexact matches for num. Try ?? num to see them.
(%o1) true (%i2)