Using an external function in GUI closes the interface

2014 7 16
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更新时间：2014 7 17
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Hello!
I am using an external function I made outside GUI (heart_rate.m) and I am using it in a push button in GUI. The problem is that every time I press the button, the functions runs and returns the value I want, but after the interface just closes by itself.
At the moment the code is something really basic like this:
function pushbutton_connect_Callback(hObject, eventdata, handles)
(..)
global HR;
HR = heart_rate(data1,sr);
msgbox(sprintf('Your heart rate is: %3.f', HR));
The msgbox appears and shows the correct number for data1, but then the thing just closes. I have also used a different external function just to test and the behaviour is the same.
Any idea on what is the problem? I am relatively new to guide, so I apologize in advance for any mistakes I may say :)

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Sara
Sara 2014-7-16
What's the code after the one you have posted? Try putting a breakpoint on the msgbox line and look at what happens when you proceed step by step.
Joseph Cheng
Joseph Cheng 2014-7-16
the whole gui closes? or just the msg box?
Inês
Inês 2014-7-17
编辑：Inês 2014-7-17
The whole gui closes. For this function there is only this portion of code, and its not connected with to any other function on gui as I am still testing it.
I narrowed to problem to the line where I call the function heart_rate. If I run the code without calling the function (i.e. comment that line) the message box appears and nothing closes. Otherwise when I run without the msgbox the interface closes down again.
If it helps, the function heart_rate is this one: heart_rate

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Geoff Hayes
Geoff Hayes 2014-7-17

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The heart_rate function, if like that in the above link, has as its first line
close all; clc;clear all;
Calling close all would close the GUI yet still allow the message box to display. Try removing this line and re-running the application.

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Inês
Inês 2014-7-17
编辑：Inês 2014-7-17
I forgot to mention that I had deleted that line to avoid such an error. Unfortunately the GUI still closes and no error is displayed :\
EDIT: just understood what the problem was. I edited heart_rate from the link and included some children functions, one of which had close all. Now it'a running.
Thanks Geoff! What a dumb mistake :)

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