[pstricks] Defining a maxmum and minimum point

Herbert Voss LaTeX at zedat.fu-berlin.de
Sun Apr 8 18:32:10 CEST 2007

Arne Hallam wrote:
> So I am going to answer part of my own question.
> I read a bit more carefully in the PST-3dplot manual and found a couple 
> of pages I had missed.  So I am part of the way there.
> In the code below I seem to be making a mistake in the definition of the 
> function so that it points down instead of up.  I cannot see anything 
> obvious in my function definition.
> z= 2(5x +4y -2x^2 +xy -y^2) -6x - 2y
there was an error in your math expression. Delete the hiddenLine
option if you do not it.


$z= 2(5x +4y -2x^2 +xy -y^2) -6x - 2y$

\psplotThreeD[hiddenLine,plotstyle=curve,linecolor=red, drawStyle=xLines,
    yPlotpoints=20, xPlotpoints=20,linewidth=0.75pt,algebraic](0,4)(0,4){%
  x 5 mul
  y 4 mul add
  x dup mul 2 mul sub
  x y mul add
  y dup mul sub
  2 mul
  x 6 mul sub
  y 2 mul sub}



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