show gradient vectors orthogonal to level curves



Jaime Villate pisze:
> On S?b, 2009-10-24 at 11:51 +0200, Adam Majewski wrote:
>> wxMaxima 0.8.3 http://wxmaxima.sourceforge.net
>> Maxima 5.19.2 http://maxima.sourceforge.net
> 
>> plotdf does not work for me.
> 
> Do you have xmaxima installed? 
I have both :
Maxima 5.16.3
Maxima 5.19.2
I use windows instaler.
In Maxima 5.16.3 I have xmaxima, but not in bin directory of 5.19.2


What's the result of the following
> command:?
> 
> (%i1) plot2d(x^2,[x,0,3],[plot_format,openmath]);

In Maxima 5.16.3 nice diagram
In Maxima 5.19.2 nothing :  no error message, no action, ready for next 
input

Regards

Adam