Can ginput be used with a fixed window size?

Hey everyone,

I really need some adivce, because I am definitely no Matlab expert.

My Problem is that I have a number of plots of which I only need a certain, but always the same, number of datapoints. So like a starting point and an endpoint. I know I could use ginput() but the selection should be automated and always bring the same amount of datapoints, which I don't manage with ginput(). Is there any other function of ginput() or a totally different function I could use?

Thanks so much,

Catherine

[Catherine Matje]

Of course I can just hard code that the first and last few lines are deleted, but I wonder if there is a more elegant solution.

Answer 1

[Bjorn Gustavsson]

You can tell ginput to return N points:

N = 11;
[x,y,B] = ginput(N);

Then ginput will stop after N points are selected.

HTH

[Catherine Matje]

Thanks for the quick response! The problem is that I can still place the points freely right? So I probably don't get the exact same location every time...

Catherine

[Bjorn Gustavsson]

If you know exactly what lines you're interested in just use the handles returned from your call to plot and delete the ones you want removed:

idxBaddies = [1 2 5 9];
ph = plot(x,y);
% After the required viewing/whatevering of the entire set of curves
delete(ph(idxBaddies))

If you still want the user to select some set of lines to keep/remove you might find something on the file exchange. Just look for "line highlight matlab" with a search-engine of your choise. Perhaps you can build something starting with the code in this contribution: makelinehighlightable

HTH