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.
-- Option variable: dontfactor Default value: []
dontfactor may be set to a list of variables with respect to which factoring is not to occur. (The list is initially empty.) Factoring also will not take place with respect to any variables which are less important, according the variable ordering assumed for canonical rational expression (CRE) form, than those on the dontfactor list.
![Dontfactor Example im:(1/2)*((z+1)/(z-1));
fm:(1/2)*((z+1)/(z-1));
pid:p+i*ts*im+d*(n/(1+n*ts*fm))=u;
dontfactor:[p, i, d, ts, n];
ratsimp(pid);
expandwrt(pid, 0);](http://maxima-online.org//plot.html?g=i459900362.png&t=img&db=r2012530644)
(%o1) true (%i2)