Thread Subject: Arrow in plots

Has anybody used 'arrow' successfully?

Try:

figure
plot(1:10)
arrow([4 0],[4 4])

this should draw an arrow from the x-axis to the straight
line. But all I get is an error:

??? Error using ==> and
NaN's cannot be converted to logicals.

Error in ==> arrow at 731
page = (~isnan(page))&(page);

Your code works fine for me (Matlab version 7.0 R14).

You may try:

annotation('arrow',[.39 .39],[.11 .39])
 
but then the xy-coordinates have to be specified in the
[0,1] space of the figure. To overcome this, check out
ds2nfu.m by Scott Hirsch on the file exchange.

TorH




"Paul " <par@ceri.memphis.edu> wrote in message
<fgb8l7$f1m$1@fred.mathworks.com>...
> Has anybody used 'arrow' successfully?
>
> Try:
>
> figure
> plot(1:10)
> arrow([4 0],[4 4])
>
> this should draw an arrow from the x-axis to the straight
> line. But all I get is an error:
>
> ??? Error using ==> and
> NaN's cannot be converted to logicals.
>
> Error in ==> arrow at 731
> page = (~isnan(page))&(page);

Your code works fine for me (Matlab version 7.0 R14).

You may try:

annotation('arrow',[.39 .39],[.11 .39])
 
but then the xy-coordinates have to be specified in the
[0,1] space of the figure. To overcome this, check out
ds2nfu.m by Scott Hirsch on the file exchange.

TorH




"Paul " <par@ceri.memphis.edu> wrote in message
<fgb8l7$f1m$1@fred.mathworks.com>...
> Has anybody used 'arrow' successfully?
>
> Try:
>
> figure
> plot(1:10)
> arrow([4 0],[4 4])
>
> this should draw an arrow from the x-axis to the straight
> line. But all I get is an error:
>
> ??? Error using ==> and
> NaN's cannot be converted to logicals.
>
> Error in ==> arrow at 731
> page = (~isnan(page))&(page);