{{incomplete|REXX| <br><br> This version doesn't: <br><br> --- find the roots of the specified function, <br> --- doesn't show the roots, <br> --- doesn't show if the root is exact or approximate. <br><br> }}
<lang rexx>/* REXX */
Parse Version v; Say v
n=1000000
Say 'N='n
Call time 'R'; Do i=1 To n; xx=f1(5); End; Say 'f1' xx time('E')
Call time 'R'; Do i=1 To n; xx=f2(5); End; Say 'f2' xx time('E')
Call time 'R'; Do i=1 To n; xx=f3(5); End; Say 'f3' xx time('E')