How to enter data from a GUI (?) rather than in code.

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Jonathan Pulman
Jonathan Pulman 2013-11-22
评论： Image Analyst 2013-11-23
How can I start a program running then, at some point dictated by the code, ask for user input such as a number or a choice of "do this or do that". (I am not sure if it is a "GUI" that I am needing.) So far I only know how to input data through the code. Jonathan.

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回答（2 个）

Walter Roberson
Walter Roberson 2013-11-22
input() to ask from the command prompt. inputdlg() for graphical work.
  2 个评论
Jonathan Pulman
Jonathan Pulman 2013-11-22
Thank you Walter. I taught myself QBasic years ago but now it is obsolete. I find the very basic things in Matlab documentation hard to understand. Examples of code provided often contain in them other things which confuse me like "twister" concerning random numbers. I look up "random" then I see "twister" so then I am trying to understand "twister" and I go in circles.
It is hard to get info if I don't know the words to search for. Matlab is really superb but my lack of basic knowledge is a problem. I find the online community really helpful; one question here saves two hours of frustration. Thank you again, Jonathan.
Iain
Iain 2013-11-22
uigetfile, uiputfile, & uigetdir will help too.

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Image Analyst
Image Analyst 2013-11-22
Here's a snippet. Feel free to modify:
% Ask user for a number.
defaultValue = 45;
titleBar = 'Enter a value';
userPrompt = 'Enter the integer';
caUserInput = inputdlg(userPrompt, titleBar, 1, {num2str(defaultValue)});
if isempty(caUserInput),return,end; % Bail out if they clicked Cancel.
% Round to nearest integer in case they entered a floating point number.
integerValue = round(str2double(cell2mat(caUserInput)));
% Check for a valid integer.
if isnan(integerValue)
% They didn't enter a number.
% They clicked Cancel, or entered a character, symbols, or something else not allowed.
integerValue = defaultValue;
message = sprintf('I said it had to be an integer.\nI will use %d and continue.', integerValue);
uiwait(warndlg(message));
end
  2 个评论
Jonathan Pulman
Jonathan Pulman 2013-11-23
This will be helpful. It is new for me but it looks like I will be able learn from it. New but not unintelligible!
Thank you. Jonathan.
Image Analyst
Image Analyst 2013-11-23
If you want to take a look at a nice framework where most stuff is done for you, check this out: http://www.mathworks.com/matlabcentral/fileexchange/24224-magic-matlab-generic-imaging-component. Please mark the best answer as "Accepted" (you can only mark one as such).

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