Vi Input Mode in Command Line Matlab

vi input mode in command line Matlab?

Yes, that should be easy enough. It's just a special case of the general "open a process and bind to its stdin and stdout" problem, and that's not difficult.

A bit of Google searching finds that IO.popen() is the right piece of Ruby for that, and there's a little more detail in the replies here: http://groups.google.com/group/ruby-talk-google/browse_thread/thread/0bbf0a3f1668184c. Hopefully, that's enough to get you started!

Update: Looks like you're almost there with your wrapper. What you need to get finished is recognize when Matlab is asking for input, and only ask the user for input then. I'd suggest trying this pseudocode:

while input_line = Readline.readline('>> ', true)
  io.puts input_line
  while ((output_line = io.gets) != '>> ')  // Loop until we get a prompt.
    puts io.gets
  end
end

That's not quite right, as you need to do the inner loop once before you ask for the first input line, but it should give you the idea. You might need to adjust the prompt text that it's looking for, too.

Update 2: Okay, so we also need to account for the fact that there's no EOL after a prompt and so io.gets will hang. Here's a revised version that uses the fact that you can give a blank line to a Matlab prompt and it will just give you another prompt without doing anything. I've rearranged the loop to make things a little clearer, though this means you now have to add logic to figure out when you're done.

while [not done]   // figure this out somehow
  io.puts blank_line                        // This will answer the first
                                            // prompt we get.
  while ((output_line = io.gets) != '>> ')  // Loop until we get a prompt.
    puts io.gets                            // This won't hang, since the
  end                                       // prompt will get the blank
                                            // line we just sent.

  input_line = Readline.readline('>> ', true)  // Get something, feed it
  io.puts input_line                           // to the next prompt.

  output_line = io.gets   // This will eat the prompt that corresponds to
                          // the line we just fed in.
end

vi input mode in R?

The Vim-R-plugin should do the trick. I have used it in Ubuntu, MacOS, and Windows 7. The developer is great and does frequent bugfixes.

To get Vim behavior in the R console you'll need to use the Conque Shell plugin, which Vim-R-plugin supports. I tried it for a day but found modality in the R command line a little tedious. All I ever use is tab completion and last command.

Is it possible to write a MATLAB script that can give command line input to a function?

If you are looking for a non elegant solution.

If you are looking for a potentially dangerous solution.

Then you might try this: write a function named "input" as follows:

function a=input(str)
% THIS IS THE DUMMY VERSION OF THE
% MATLAB BUILT-IN FUNCTION "input"
global dummy_input

disp('WARNING!!!')
disp('MATLAB "input" built-in function overridded')

disp(['Setting dummy_inpt'])
a=dummy_input;
end

Declare a global variable either in the script you use to test the function and in your "dummy" input function.

Assign the desired value to the global variable as follows:

global dummy_input

x=3;

dummy_input=123;

y=my_func(x)

dummy_input=42.13;

y=my_func(x)

If my_func is the function you post in the question, you will obtain:

WARNING!!!
MATLAB "input" built-in function overridded
Setting dummy_inpt

y =

   126

WARNING!!!
MATLAB "input" built-in function overridded
Setting dummy_inpt

y =

   45.1300

I've added the printing of the warnings in the "dummy" input function yust as a remainder ...

You do not need to modify the function you want to test, when it will call input to get a number from the user, it will call your "dummy" input.

Version 2 of the "dummy" input function

This version of the "dummy" input function allows autonatically handling multiple request of input values.

It requires the user knows in advance how many times the "original" input function is called.

No additional global counter is required.

It is sufficient the change the definition of the global parameter in the script, declaring it as an array containing the set of input the user want to assign:

global input_list
input_list=[27    30     5    31    21]

In the "dummy" input function, the first element of the array is assigned to the output variable, then the it is deleted:

a=input_list(1);
input_list(1)=[];

the code of the updated version of the function is the following:

function a=input(str)
% THIS IS THE DUMMY VERSION OF THE
% MATLAB BUILT-IN FUNCTION "input"
global input_list

disp('WARNING!!!')
disp('MATLAB "input" built-in function overridded')

disp(' ')
disp(' ')
disp(' ')
if(isempty(input_list))
   error('Error in DUMMY input: no more input data')
else
   disp(['Setting dummy_input ' num2str(input_list(1))])
   a=input_list(1);
   disp(' ')
   disp(' ')
   disp(' ')

   input_list(1)=[];
end

end

An error is generated in case the input array becomes empty (by deleting its element at each call) before the end of the script.

I've also added some calls to disp to make more "clear" the output on the Command Window.

Also the "dummy" input function print a message on the Command Window telling which input values has been assigned.

Make sure to remove your dummy "input" function at the end

Hope this helps.

call system command within MATLAB

Use the echo command to include a return message:

[status,message] = system('yourCommand && echo hello world' )

will return:

message =
      hello world

Generally you will need to create a string where you cascade all your commands connected with &&. One of the commands could then be echo something.

Regarding your edit:

output = 'processing value ...'    
command = ['cd ' myCMD ' && myCommand.bat' ' && echo ' output];
[status,message] = system( command )

will call myCommand.bat and return "processing value...".

MatLab, missing - in command line

That's because you're starting a loop. It's waiting for you to type the code to go within the loop, and it is terminated when you type end to end the loop. For example:

if(x==0)
  y = y + 1;
end

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