Error About Unassigned Output Argument in Matlab

" Explanation:

One of the functions you have called is defined to return an output argument but that output argument does not exist in the function when it tries to return.

Common causes:

You have misspelled the name of one of your output arguments inside your function, or you have forgotten to assign a value to one of the output arguments of your function. Alternatively, the function was originally written with one or more output arguments, but the section of the function that computed the output argument was removed or modified in such a way that the output argument is now extraneous.

Solution:

Stop MATLAB on the last line of the function listed in the warning or error message. Verify that each of the output arguments listed in the function declaration line at the beginning of the function exist after that last line is executed (using the DBSTEP function or the Step button in the Editor). If the arguments do not exist, examine the function to determine where you intended the arguments to be declared. Verify that those lines of code are being executed and have no typographical errors."

http://www.mathworks.com/support/solutions/en/data/1-FA99V6/index.html

I had found the link mentioned by you. But I could not solve the problem using that. Please refer to the images shown above. The first one shows the output window of matlab. The second is the function that i calls the matrix_vor function. The third image is the matrix_vor function file.

Please, let me know the error in them, and the rectification for it.

Well I did another experimentation:

I found out this-

The output of the first called function are not being passed as input to the second called function. I mean the output of input_val are not being passed to matrix_vor. In basic c-language we need to define the variables as global variables to achieve such thing. What do we need to do in MATLAB?

Hi dreamz,

This error is quite straightforward.The for-loop (i=1:m) you defined, is only entered correctly if m >= 1. If m <1, the function does NOT enter the for-loop, and therefore does not assign your d-variable, thus gives an error instead.

If m can/may be smaller than 1, this can be circumvented by adding following code to your matrix_vor function:

<code>

if ~exist('d') d=[]; end

</code>

PS: You can even write this function in one line (including the solution) by using:

<code> d(1:m) = 0.5* ones(m,1); </code>

Kind regards,
Ryton