matlab coder error

i tried to convert a function from matlab to c. the function,s part accounting for error is:_

>> a=input('code no');
   if (a == 1)
    disp(' ');       >>

the error in code generation report screen reads:-

Expected either a logical, char, int, fi, single, or double. Found a MATLAB type. MATLAB types are returned from calls to the MATLAB interpreter and are not supported inside expressions. They may only be used on the right-hand side of assignments and as arguments to MATLAB calls.

how to avoid such error while convertion.

Answer 1

[Walter Roberson]

input() evaluates what the user enters and so could return any arbitrary MATLAB type.

Possibly you might need to input a string and convert the string to a number.

Answer 2

[Kaustubha Govind]

The error is occurring because you are calling an extrinsic function (input) that is not support for code generation. Therefore, the MATLAB Coder does not know what the expected return type is. See Working with mxArrays for more explanation. The solution in these cases is to pre-allocate 'a' so MATLAB Coder knows what type to expect. For example, use:

a=0; %specify size and type
a=input('code no'); 
if (a == 1) 
disp(' ');
end