How do I load graph automatically based on the data selected?

I've a problem to display a graph in the axes based on the data selected. I have a 'push button' function, then when I click on it the location of data selected will be shown in edit text. The problem is I've push button function named 'Analysis' and when I click on it, the graph won't displayed. So what I do is I used this code to display the graph in Analysis button:

sig = load('example of data.txt');

plot(sig)

grid on

hold on

plot(sig,'ro')

But I got a lot of data and I want it to read from the data selected in edit text function.

Thank you in advance for any help