add a number to the legend

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Dominika
Dominika 2014-5-20
评论： Dominika 2014-5-22
Hi,
I want to add a legend to the plot so that each time the button in GUI is pressed the legend will show a string with corresponding number.
I want to work it like this:
First plot: Sandwich panel(1), second plot: Sandwich panel(2), etc...
My current code:
semilogx(f,TL,'DisplayName','Sandwich panel');
grid on
ylabel('Transmission Loss [dB]');
xlabel ('Frequency')
xlim([80 10000])
title('Transmission Loss')
legend('-DynamicLegend','location','best')
hold all
Thanks,
Dominika

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回答（2 个）

Sara
Sara 2014-5-20
legend(['Sandwich panel(',num2str(put_number_here),')'])
or you could use sprintf.
  2 个评论
Dominika
Dominika 2014-5-20
Thanks for an answer Sara but I want Matlab to do it automatically, each press of the button in GUI will produce a string 'Sandwich panel' with a counting number.
Sara
Sara 2014-5-20
Dominika, do you mean you need a way to count how many times the button has been pressed? In that case, you'll have to create a variable that is incremented any time you press the button, set it to zero in the opening_funct of the gui, and increment it in the pushbutton callback. Make sure to have:
guidata(hObject, handles);
at the end of the callback. Does this help?

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David Sanchez
David Sanchez 2014-5-20
Continuing with Sara's comment:
In your callback function,
N_pushes = N_pushes + 1;
my_str = sprintf('Sandwich panel %g',N_pushes);
legend(my_str);
  5 个评论
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Sara
Sara 2014-5-21
Do you have the instruction
guidata(hObject, handles);
at the end of EACH callback, including the opening function? Otherwise the variables you add to handles are not saved.
Dominika
Dominika 2014-5-22
Works like a charm.
Thank you so much.
Have a nice day!

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