Why do I keep getting this error on function

I am trying to generate a function that creates an output of very extensive wave forecast data divided in cell array.

The code goes like this,

 clc,clear all

 fid = urlwrite('http://www.ndbc.noaa.gov/data/realtime2/41115.spec','Rincon.txt'); % URL from CARICOOS
cac = cssm(fid)

The function goes like this,

 function    cac = cssm() 
        fid = fopen( 'Rincon.txt' );
        cac = textscan( fid, '%d%d%d%d%d%f%f%f%f%f%s%s%s%f%f' ...
                    ,   'Delimiter'             ,   ' '     ...
                    ,   'CollectOutput'         ,   true    ...
                    ,   'HeaderLines'           ,   2       ...
                    ,   'MultipleDelimsAsOne'   ,   true    ...
                    ,   'Whitespace'            ,   ''      ...
                    );
        fclose( fid );
    end

I keep getting this error and don't know how to fix it, could you please help?

 ??? Error using ==> cssm
Too many input arguments.

 Error in ==> ult1 at 4
cac = cssm(fid)

Answer 1

[Wayne King]

You need to define your function with the input argument

function cac = cssm(fid)

then pass the function the file identifier, don't put it inside your function.

Why do you have code like this:

   fid = urlwrite('http://www.ndbc.noaa.gov/data/realtime2/41115.spec','Rincon.txt'); % URL from CARICOOS
   cac = cssm(fid)

and then on line two of your function, you have

fid = fopen('Rincon.txt');

??

Either declare the function with NO input arguments

function cac = cssm

and do everything internally, or pass, the function the fid argument and get the file identifier before you call the function.

[Juan Rosado]

Thank you

:)