Very slow ginput in 2014b

Hi people,

I started to use 2014b recently. One problem is the ginput function works extremely slow! The cross point can't follow the mouse smoothly. Any idea what is the reason? Maybe some settings are not optimized? Thanks!

Yu

[Doug Hull]

can you give the code you used so we can try to reproduce?

[Chad Greene]

I've experienced this in 2014b and pre-2014b for plots of large data sets. For example,

pcolor(peaks)
shading interp
ginput

works fine, but

pcolor(repmat(peaks,50,50))
shading interp
ginput

is very slow.

[Yu Mu]

Hi Doug, I'm using this command to draw some ROIs. It worked smoothly in the old version, but extremely slow in 2014b. Below is the code I'm using, but 'ginput' works slowly even in any circumstances I tried. Do you have any idea how to improve this? Thanks!

    tmp = rand(1000, 1000, 3);
    image(tmp);
    [x y button]=ginput(1);
    if button ==2
        break;
    elseif button ~=1
        continue;
    else
        %h=imfreehand(ha);
        %cmask(:,:,z)=cmask(:,:,z)+createMask(h);
        [x y button]=ginput(1);

        if button ~=1
            continue;
        else
            delete(h);
            h=imfreehand(ha);
            %cmask(:,:,z)=cmask(:,:,z)+createMask(h); 
        end        
    end

[Catherine]

Doug,

My analysts are also complaining about this. Ginput worked fine in 2013a, but when they upgraded to 2014b it slowed down extremely. Same code - nothing was changed except upgrade to 2014b.

[Jeffrey]

Hi, guys.

I just updated from 2015b to 2016a and have the same issue as mentioned above... GINPUT is so slow to react to mouse movements.

I also have a GUI that specifies a WindowButtonMotionFcn for mouse movement controls and have the same issues. I'm assuming the two are related.

Is there any known way to solve this?

Answer 1

[Chad Greene]

I made a function finput that creates a temporary set of axes atop the current axes, then calls ginput. In a couple of quick tests on my computer, finput is much faster than ginput for large datasets.