Beatnik he's trying to do it without useing the built in square root function.

Well, first up your regex fails on an integer.

Update:

Well there ya go, I should have paid attention in class. Go read ariels tract on finding roots, he's clearly done this in a lot more detail than I have.

And I usually shy away from ariels notation, because to me 1e-18 says e^-18 rather than 10^-18. That always bugged me. Personally I'd rather use 10**(-18).

/Update

Since the way to find roots with maximum speed is to use hand-tuned assembler that exploits the quirks of the processor, there's no need to stress speed.

As for your concern about calling new_guess twice, why not try this?

my $n=0;
Hahaha:


$guess = new_guess($guess, $x); # MAKE OLD GUESS THE NEW GUESS AND RUN
+ WHILE LOOP AGAIN

$n=new_guess($guess, $x);

goto Hahaha if get_accuracy($guess, $n)  > .000000000000000001 { # CHE
+CK DIFFERENCE BETWEEN OLD GUESS AND NEW GUESS

[download]

Actually this should work fine: 


        my ($guess, $x) = @_;
 my $n=0;
        while ( get_accuracy($guess, $n)  > .000000000000000001) { # C
+HECK DIFFERENCE BETWEEN OLD GUESS AND NEW GUESS
                $guess = $n;
  $n=new_guess($guess, $x); # MAKE OLD GUESS THE NEW GUESS AND RUN WHI
+LE LOOP AGAIN
        }

[download]

____________________
Jeremy
I didn't believe in evil until I dated it.

In reply to Re: Square Root algorithm by jepri
in thread Square Root algorithm by nysus

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