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Home > Forums > Programmers > Languages > Prolog Forum

square root iterative

thread345-1620471
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onlyuros (Programmer)
17 Sep 10 8:41
Aloha,

what would be the way to calculate the square root of a number e.g. A with precision E with formula X(0)=(A+1)/2, X(i)=(X(i-1) + A/X(i-1))/2, i=1,2,... ? Tnx!
joel76 (Programmer)
17 Sep 10 18:43
What have you tried ?
joel76 (Programmer)
17 Sep 10 18:47
You should have written :
X(0)=(1+A/1)/2,
X(i)=(X(i-1) + A/X(i-1))/2.
It is easier to see the recursion.
onlyuros (Programmer)
17 Sep 10 21:20
Ah yes, sorry. I have no idea how to do it since I'm quite new to prolog.
joel76 (Programmer)
18 Sep 10 2:59
You can do it with a predicate of 4 arguments my_square_root/4 .
arg 1 : the number you're looking for the square_root.
arg 2 : epsilon
arg 3 : the current computed value of the square root
arg 3 : the final result

 
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