Matlab compiler: interactive input like INPUT function

When making compiled programs with the Matlab compiler, is there a way of accepting variables from the user after the program has started running?

I know that variables can be passed in as command line options when executing the program.

But I want to use something like the Matlab INPUT command (this causes an error)

Thanks.

[Walter Roberson]

I wonder if fid 0 (standard input) and fid 1 (standard output) are connected usefully in a compiled routine?

[Kaustubha Govind]

What is the error you get when compiling with the INPUT function? Also please mention what platform you are working on.

[Walter Roberson]

If windows, is it a console application or a standalone application that you are producing? It would not surprise me if input() failed on a standalone application.

[Edward]

How do you use standard input (0)?

I have been able to use standard output by doing fwrite(1,etc..)

fread(0,...) doesn't work

Answer 1

[Ahmed Saad]

please tell me how it can be passed in as command line options,i have the same problem

[Walter Roberson]

The top level routine you compile must be a function (a compiler restriction). That function can have arguments. Anything typed on the command line that is not grabbed by the operating system, will be passed in as arguments to the function, as strings (NOT as numeric values!)

[Ahmed Saad]

thank you walter,but i still did not get it well .could you explain more,sorry i am still a beginner

[Walter Roberson]

Quick example:

function YourMainFunction(varargin)

if nargin >= 1

firstarg = str2double(varargin{1});

else

firstarg = [];

end

[Ahmed Saad]

i did not get it work but thank you for your kind reply

[Edward]

Ahmed - try this:

1) Make the following matlab function as usual:

function boob(a,b)

if ischar(a)

aa=str2num(a);

else

aa=a;

end

if ischar(b)

bb=str2num(b);

else

bb=b;

end

v = aa + bb;

fprintf('The answer is: %i \n',v)

end

2) Compile with the Matlab compiler

3) Run from a (windows) command line:

boob.exe 5 8

4) obtain:

The answer is: 13

Answer 2

[Edward]

Thanks Walt

I am compiling a standalone executable, running from the windows command terminal. For example:

function input_test1(a)

  fprintf('Input argument is: %s \n',a)

  x = input('Please input a letter... ','s');

  fprintf('\nYou typed: %s \n\n',x)

end

This compiles and runs fine, up to the point where you input the letter. It then gives the error:

'y' is not recognized as an internal or external command, operable program or batch file.

(where y is the actual letter typed). Am I doing something wrong here?

In Mex files I have found that you can use the input function with mexCallMATLAB, so maybe that is the way to go. Seems inconvenient though.

Not sure how to use standard input.

[Kaustubha Govind]

Strange - it looks like the entered value is getting evaluated. I wonder if input('Please input a letter... ','s') is being treated like input('Please input a letter... ') in deployed mode. What happens if you input the name of a MATLAB function like 'rand' instead of 'y'.

[Walter Roberson]

That isn't it, Kaustubha. The error being generated is from MS Windows -- the input is going to CMD not to the program. MATLAB would complain about no routine named "y" but would not complain about it not being a batch file.

[Kaustubha Govind]

Ah. That makes sense.

[Amro]

if you want this to work, you must choose "console application" NOT "windows standalone application" from the deploytool dialog. This is equivalent to compiling as:

mcc -W main -T link:exe myfunc.m