display value in message box

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son
son 2014-8-20
评论： Image Analyst 2020-5-17
hi, please help.
i create a multiple choice box and then display value of a in a message box but i don't know how to put the value of 'a' in the message box.
close all
clear all
choice = menu('Choose optical fiber type','Single-mode fiber ( G.652 )','Dispersion-shifted fiber ( G.653 )','Non-zero dispersion-shifted fiber ( G.655 )');
if choice==1
a=1;
elseif choice==2
a=2;
else
a=3;
end
h = msgbox(Message)

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采纳的回答

Star Strider
Star Strider 2014-8-20
Is this:
h = msgbox(sprintf('You chose %d',a))
something like what you want to do?
  2 个评论
son
son 2014-8-20
编辑：son 2014-8-20
hi, i use sprintf code but now it can't display the special symbol alpha
clear all
close all
%%Insert value in Matlab
dlg_title = 'Insert Factor Value';
x1 = inputdlg('Enter number of channels:',dlg_title, [1 50]);
n = str2num(x1{:});
x2 = inputdlg('Enter input power for each channel (mW):',dlg_title, [1 50]);
p = str2num(x2{:})*10^-3;
x3 = inputdlg('Enter channel spacing (nm):',dlg_title, [1 50]);
delta_lambda = str2num(x3{:})*10^-9;
CreateStruct.Interpreter = 'tex';
CreateStruct.WindowStyle = 'modal';
choice = menu('Choose optical fiber type','Single-mode fiber ( G.652 )','Dispersion-shifted fiber ( G.653 )','Non-zero dispersion-shifted fiber ( G.655 )');
if choice==1
alphadb = 0.20;
dispersion=16;
slope=0.080;
A=80;
elseif choice==2
alphadb = 0.22;
dispersion=0;
slope=0.075;
A=50;
else
alphadb = 0.23;
dispersion=3;
slope=0.050;
A=72;
end
h = msgbox({sprintf('Fibre attenuation: \alpha = %g (dB/km)',alphadb)
'Derivative dispersion coefficient: s = dD/d\lambda = 0.075 (ps/nm^2.km)' },'Standard Values',CreateStruct);
Star Strider
Star Strider 2014-8-20
In sprintf, single ‘\’ are control characters for it and will throw an error if sprintf doesn’t recognise a valid control sequence, so to get it to print a ‘\’ that the TeX interpreter will see and interpret requires a double ‘\\’.
This worked for me, displaying both alpha and lambda as special characters:
h = msgbox({sprintf('Fibre attenuation: \\alpha = %g (dB/km)',alphadb)
'Derivative dispersion coefficient: s = dD/d\lambda = 0.075 (ps/nm^2.km)' },'Standard Values',CreateStruct);

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更多回答（3 个）

Image Analyst
Image Analyst 2014-8-20
son, you don't need to get the handle from the message box if you don't ever use it. And you might want to use uiwait() and make it modal, rather than the way you and the others did it, so that it waits for the user to click OK before blasting onwards, executing subsequent code before the users have even had a chance to click OK yet.
message = sprintf('You clicked on button #%d,\nwhich set a = %f', choice, a);
uiwait(msgbox(message, 'modal'));
Alternatively you can use helpdlg() instead of msgbox() if you want an "text balloon" displayed or warndlg() if you want an exclamation point displayed.
uiwait(helpdlg(message)); % Has text balloon
uiwait(warndlg(message)); % Has exclamation symbol
Hope this helps. Vote for my answer if it was helpful additional information.
Ben11
Ben11 2014-8-20
You can use sprintf to format the message:
Message = sprintf('The value selected is %d\n',a);
h = msgbox(Message)
son
son 2014-8-20
woa, so easy, many thanks
  4 个评论
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Victoria Viridiana Cabrera Díaz
Victoria Viridiana Cabrera Díaz 2020-5-17
Eduardo Rey, hope this helps
uiwait stops your code from keeping on running until you click 'ok' in the message box
uiwait(msgbox(sprintf('var1 name: %2.3g \n var2name: %2.3g',var1,var2)));
Image Analyst
Image Analyst 2020-5-17
If you don't know how many there will be, you might want to display them all in a scrollable listbox. For example, if there were thousands of numbers you wouldn't want a msgbox.
r = rand(100, 1); % Your list of numbers.
list = num2str(r) % Turn into strings.
% Now display all the numbers in a scrollable listbox.
[indx,tf] = listdlg('ListString',list)

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