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- Newsgroups: comp.soft-sys.matlab
- Path: sparky!uunet!stanford.edu!nntp.Stanford.EDU!forsythe.stanford.edu!nova!maurer
- From: Michael Maurer <maurer@nova.stanford.edu>
- Subject: Re: Help! Plotting.
- Message-ID: <maurer.727998312@nova.Stanford.EDU>
- Sender: news@leland.Stanford.EDU (Mr News)
- Organization: STAR Lab, Stanford University, California USA
- References: <1993Jan24.233400.1494@jupiter.sun.csd.unb.ca>
- Date: 25 Jan 93 21:45:12 GMT
- Lines: 23
-
- In <1993Jan24.233400.1494@jupiter.sun.csd.unb.ca> dwoo@jupiter.sun.csd.unb.ca (Dennis Woo) writes:
-
- >I entered the following lines in matlab:
- >
- > [w0,w1]=meshdom(-5:.1:5,-5:.1:5);
- > z = 2*(w0.^2) + 3*(w1.^2) - 12*w0 - 8*w1
- > + 2*(w0.*w1) + 36*ones(w0);
- > contour(z)
-
- >Instead of contours (these contours are ellipses) centered at (2.8,0.4)
- >with a z-value of 17.6, I got the contours centered at around
- >(85,60).
-
- Your mistake is to omit the axes specifications to 'contour'. Without
- these, 'contour' will use the indices into the array 'z' as the x- and
- y-axes. Instead you should say
-
- contour(z,-5:.1:5,-5:.1:5)
-
- Good luck.
- --
- ______________________________________________________________________
- Michael Maurer maurer@nova.stanford.edu (415) 723-1024
-