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## contour plot + lines

**From**: |
Claudio Belotti |

**Subject**: |
contour plot + lines |

**Date**: |
Wed, 15 Sep 2004 15:40:57 +0200 |

**User-agent**: |
Mutt/1.5.6+20040722i |

Hi all,
I have
[xx,yy]=meshgrid(x,y)
zz=f(xx,yy)
and I plot zz with
contour(xx,yy,zz)
now I would like to plot some lines on this plot something like and/or some
points
I tried (with hold on)
plot3(0,0,500,"r+");
and
plot(0,0,"r+")
but I got only "Notice: cannot contour non grid data!"
how can I do?
thanks
Claudio
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**contour plot + lines**,
*Claudio Belotti* **<=**