Thread Subject: plotyy&annotating

well,the data are as followed:
[x,y1],[x,y2],[x,y3];
I want to plot three lines. plot y1,y2 for the left
axes,and plot y3 for the right axes.
It seams that we can just plot 2 lines with the
function "plotyy".
I add another "plot",but I failed to annotate the figure.
my code are as followed:

[Ax,H1,H2]=plotyy(x,y1,x,y3);
hold on
H3=plot(x,y2);
set(gca,'XTick',[0 3 6 9 12 15 18],'XTicklabel',[08 11 14
17 20 23 02])
legend('modis','usgs','diff')

I can't get the right legend and XTicklabel.

Do you have any good ideal?
any suggestion is appreciated!
Thanks!

"Wu Zhiyong" <wuzhiyong_163@163.com> wrote in message
<fuc9ie$qp7$1@fred.mathworks.com>...
> well,the data are as followed:
> [x,y1],[x,y2],[x,y3];
> I want to plot three lines. plot y1,y2 for the left
> axes,and plot y3 for the right axes.
> It seams that we can just plot 2 lines with the
> function "plotyy".
> I add another "plot",but I failed to annotate the figure.
> my code are as followed:
>
> [Ax,H1,H2]=plotyy(x,y1,x,y3);
> hold on
> H3=plot(x,y2);
> set(gca,'XTick',[0 3 6 9 12 15 18],'XTicklabel',[08 11 14
> 17 20 23 02])
> legend('modis','usgs','diff')
>
> I can't get the right legend and XTicklabel.
>
> Do you have any good ideal?
> any suggestion is appreciated!
> Thanks!
>


Something likes this
[Ax,H1,H2]=plotyy(x,[y1;y2],x,y3);
legend([H1;H2],{'modis','usgs','diff'})
set(Ax(1),'XTick',[0 3 6 9 12 15 18],'XTicklabel',[08 11 14
17 20 23 02])
set(Ax(1),'XTick',[])


Anh Huy Phan
BSI - RIKEN

"Wu Zhiyong" <wuzhiyong_163@163.com> wrote in message
news:fuc9ie$qp7$1@fred.mathworks.com...
> well,the data are as followed:
> [x,y1],[x,y2],[x,y3];
> I want to plot three lines. plot y1,y2 for the left
> axes,and plot y3 for the right axes.
> It seams that we can just plot 2 lines with the
> function "plotyy".
> I add another "plot",but I failed to annotate the figure.
> my code are as followed:
>
> [Ax,H1,H2]=plotyy(x,y1,x,y3);
> hold on
> H3=plot(x,y2);
> set(gca,'XTick',[0 3 6 9 12 15 18],'XTicklabel',[08 11 14
> 17 20 23 02])
> legend('modis','usgs','diff')
>
> I can't get the right legend and XTicklabel.
>
> Do you have any good ideal?
> any suggestion is appreciated!
> Thanks!

I'd use LINE rather than PLOT in this case:

H3 = line(x, y2, 'Parent', Ax(1))

Then pass in a vector of handles as the first input to LEGEND:

legend([H1, H2, H3], ...)

--
Steve Lord
slord@mathworks.com

> Something likes this
> [Ax,H1,H2]=plotyy(x,[y1;y2],x,y3);
> legend([H1;H2],{'modis','usgs','diff'})
> set(Ax(1),'XTick',[0 3 6 9 12 15 18],
> 'XTicklabel',[08 11 14 17 20 23 02])
> set(Ax(1),'XTick',[])
> Anh Huy Phan

> I'd use LINE rather than PLOT in this case:
> H3 = line(x, y2, 'Parent', Ax(1))
> Then pass in a vector of handles as the first input to
> LEGEND: legend([H1, H2, H3], ...)
> Steve Lord

I don't see why people should have to put up with so
cryptic an interface as plotyy. One shouldn't have to
mess with all these handles to do something so basic
as to plot 3 lines with a legend.

I've developed an alternative interface (called plt)
for this type of thing. For instance the above would be:

plt(x,[y1;y2;y3],'Right',3,...
    'TraceID',{'modis','usgs','diff'});

The 'Right' parameter tells plt to put the 3rd trace
on the right hand axis. (You still would need the
set gca command however to get the unusual x-axis ticks.)

Of course, there are many more options in plt for making
the plot appear as you prefer - see plt.chm to see what
they are. (Note: available from the file exchange).