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#3813 rectform(erf(2.0*(1+%i)) => big mess

None
open
nobody
rectform (10) erf (3) complex (38)
5
2021-07-19
2021-07-17
Stavros Macrakis
No 
rectform(erf(2.0*(1+%i)));
   =>  (erf(2.0*(%i+1))+erf(2.0*(1-%i)))/2-(erf(2.0*(1-%i))-erf(2.0*(%i+1)))/2

rather than

0.1272916294631408*%i+1.151310866398069

Maxima 5.45.1 SBCL 2.0.0 Windows 11

Discussion

  • Stavros Macrakis

    Stavros Macrakis - 2021-07-17
    • Description has changed:

    Diff:

    --- old
+++ new
@@ -1,6 +1,10 @@
+~~~
 rectform(erf(2.0*(1+%i)));
    =>  (erf(2.0*(%i+1))+erf(2.0*(1-%i)))/2-(erf(2.0*(1-%i))-erf(2.0*(%i+1)))/2
+~~~

 rather than

-0.1272916294631408*%i+1.151310866398069
+``0.1272916294631408*%i+1.151310866398069``
+
+Maxima 5.45.1 SBCL 2.0.0 Windows 11
     

  • Jaime E. Villate

    Jaime E. Villate - 2021-07-18

    Notice that the following two commands work fine:

    rectform(erf(expand(2.0*(1+%i))));
rectform(erf(2.0+%i*2.0));
     

    • Stavros Macrakis

      Stavros Macrakis - 2021-07-19

      Those work fine even without the rectform.
      That's the point -- rectform should be applied to the arguments of erf.

       

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