how to solve an error using uiwait?

I get these errors using uiwait . how could i solve that ?

Error using uiwait (line 48)

Input argument must be of type figure

Error in fileext (line 121)

uiwait(helpdlg('Examine the figures, then click OK to finish.'));

Answer 1

[Walter Roberson]

You could get that error under a couple of different circumstances:

• the helpdlg somehow gets closed before uiwait() gets control, in which case uiwait() would be passed a handle to a deleted figure
• or perhaps you have some non-standard helpdlg() function that is not returning the handle to a figure

Experiment with

h = helpdlg('Examine the figures, then click OK to finish.');
class(h)
if ishghandle(h); uiwait(h); end

This will allow you to examine what is being returned by helpdlg. class() will stil show 'matlab.ui.Figure' for deleted figures, but ishghandle() is false for deleted figures

[Walaa]

Thank you