Thread Subject: ginput problem

I'm having trouble with the ginput command. I use it in a program to extract data points from a graph displayed on screen by clicking the mouse on the axes and plot. Previously, this program and ginput worked without any problem. However, just today I tried to use the program again and nothing happened after the first use of ginput. I selected the points on the plot and pressed return, after which Matlab displayed the 'busy' status indicator but did not move on to the next part of the program. When forcing the program to stop through control-c, I got the following message:

Error in ==> ginput at 99
keydown = wfbp;

Error in ==> plot_sample at 17
[X,Y] = ginput;

Has anyone come across this problem? Any idea why ginput has suddenly stopped working for me?

Many thanks,

Michael

"Michael Spurr" <michael.spurr@nospam.selexgalileo.com> wrote in message <gho80e$bv2$1@fred.mathworks.com>...
> I'm having trouble with the ginput command. I use it in a program to extract data points from a graph displayed on screen by clicking the mouse on the axes and plot. Previously, this program and ginput worked without any problem. However, just today I tried to use the program again and nothing happened after the first use of ginput. I selected the points on the plot and pressed return, after which Matlab displayed the 'busy' status indicator but did not move on to the next part of the program. When forcing the program to stop through control-c, I got the following message:
>
> Error in ==> ginput at 99
> keydown = wfbp;
>
> Error in ==> plot_sample at 17
> [X,Y] = ginput;
>
> Has anyone come across this problem? Any idea why ginput has suddenly stopped working for me?
>
> Many thanks,
>
> Michael

can you post your code? the error message doesn't say much and has probably only been displayed because of the forced exiting of the function using ctrl+c.

have you tried using ginput with a set number of points as a test? e.g. [x,y]=ginput(2)

This is highly embarassing, but it turns out I was pressing 'return' on the wrong window! I was doing it on the Matlab window rather than the image window. It appears that my brain is already shutting down for the Christmas period!

Thanks for the advice and sorry about the waste of time.

Michael