MATLAB: Ginput doe not work anymore

ginput

[TrajX, TrajY] = ginput;

this has worked great but now does not work at all. I click mouse to select a region — with simultaneous press of shift, or without — and I get nothing. What is the problem? I have checked the Matlab help and documentation, but no clue how to use it

Best Answer

From the documentation: "[x,y] = ginput gathers an unlimited number of points until you press the Return key."

Did you press the Return key after clicking in the axes one or more times? The ginput function won't return, and won't assign any values to the outputs with which you called it, until you do.

Related Solutions

MATLAB: Ginput used to work now it doesn’t

Return has always been documented as terminating the input early, since the days of R13 at least.

It does not matter to ginput whether the user shift-clicks or not: they just need to click in two places and then press return. Or you could use

[TrajX, TrajY] = ginput(2);

Or perhaps it would make more sense to use imrect

MATLAB: How to execute loop again and again without double executing the program

Kanu, something like (not optimized)

 ...
 exitFLAG = true;
 while exitFLAG
    [x,y] = ginput(2)
    if ~strcmp(get(gcf,'Selectiontype'),'normal')
        exitFLAG = false;  % exit for mouse right-click
    end
    distance = sqrt((x(2)-x(1))^2+(y(2)-y(1))^2) 
    Message  = sprintf('the distance is %3f pixel', distance); 
 end

Best Answer

Related Solutions

MATLAB: Ginput used to work now it doesn’t

MATLAB: How to execute loop again and again without double executing the program

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