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FACTORIAL


## Function that calculates the factorial of a number
## Usage : f=factorial(n)
function f=factorial(n)
## Initialize the output
f=1;
## Check whether the input is correct
if ( (n<0) || (rem(n,1)~=0) )
printf("n cannot be a negative number. Exiting...\n");
return
endif
for num=1:n
f*=num;
endfor
endfunction

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