Dispatch function

[pritika malhotra]

Hello! I was trying to use this given example from documentation and as this function is no longer available. 
Then what will be the replacement of "dispatch ("sin", "spsin", "sparse matrix");"

Through earlier discussion, I have come to know that we can define classes. How can we do that?
A simple illustration if possible Or is there some other to do so.

function y = spsin (x)
  printf ("Calling spsin\n");
  fflush(stdout);
  y = spfun ("sin", x);
endfunction

dispatch ("sin", "spsin", "sparse matrix");
y0 = sin(eye(3));
y1 = sin(speye(3));

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Pritika Malhotra