MATLAB: Error: Not Enough Input Arguments

MATLABpolynomialsroots

Im not that experinced in matlab yet, and Im facing a problem. When I write roots command like that:
roots([3 -2 -4])
or
p = [3 -2 -4];
roots(p)
Whenever I run the program I get the following:
Not enough input arguments.
Error in roots (line 2)
Delta = b^2 – 4*a*c ;
Error in Untitled3 (line 1)
roots([3 -2 -4])

Best Answer

Once, I tried to reproduce the same error, I could not
>> p = [3 -2 -4];
roots(p)
ans =
    1.5352
   -0.8685
One Suspect: Is there any other file name as roots.m in the same working directory?
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