Fix for plotyy demo

[John W. Eaton]

On 13-Dec-2007, Michael Goffioul wrote:

| Index: scripts/plot/plotyy.m
| ===================================================================
| RCS file: /cvs/octave/scripts/plot/plotyy.m,v
| retrieving revision 1.9
| diff -c -p -r1.9 plotyy.m
| *** scripts/plot/plotyy.m       4 Dec 2007 03:03:55 -0000       1.9
| --- scripts/plot/plotyy.m       13 Dec 2007 09:03:03 -0000
| *************** endfunction
| *** 131,137 ****
|   %! x = 0:0.1:2*pi;
|   %! y1 = sin (x);
|   %! y2 = exp (x - 1);
| ! %! ax = plotyy (x, y1, x - 1, y2, @@plot, @@semilogy);
|   %! xlabel ("X");
|   %! ylabel (ax(1), "Axis 1");
|   %! ylabel (ax(2), "Axis 2");
| --- 131,137 ----
|   %! x = 0:0.1:2*pi;
|   %! y1 = sin (x);
|   %! y2 = exp (x - 1);
| ! %! ax = plotyy (x, y1, x - 1, y2, @plot, @semilogy);
|   %! xlabel ("X");
|   %! ylabel (ax(1), "Axis 1");
|   %! ylabel (ax(2), "Axis 2");

I made this change.

Thanks,

jwe