Re: [Maxima-discuss] plotdf error, was: XMaxima in Maxima 5.40 seems broken in Windows and wxMaxima has issues

[Jaime V. <vi...@fe...>]

On 30-07-2017 22:12, Jaime Villate wrote:
> I will investigate it further and use use a test for when $fac is 
> Infinite in which case I believe the step of drawing the arrow should 
> be skipped.

This patch seems to solve the problem:

$ diff -u /usr/local/bin/xmaxima xmaxima.patched
--- /usr/local/bin/xmaxima    2017-07-30 21:21:54.201491217 +0100
+++ xmaxima.patched    2017-07-30 22:35:25.747195498 +0100
@@ -5716,7 +5716,9 @@
          set dfy [lindex $all [incr i]]
          #puts "[$storx $x] [$story $y] x=$x y=$y dfx=$dfx dfy=$dfy 
fac=$fac"
          # puts "$len $dfx $dfy"
-        drawArrowScreen $c $x $y [expr {$fac * $dfx}] [expr {$fac * 
$dfy} ] $vectors
+                if {$len != 0.0} {
+                    drawArrowScreen $c $x $y [expr {$fac * $dfx}] [expr 
{$fac * $dfy} ] $vectors
+                }
          }
      }

However I will make several tests before I commit it.

Regards,

Jaime