#20346 [NEW]: Computation Error

From: sprice@wisc.edu Operating system: Darwin 6.1 (Mac OS X.2.1) PHP version: 4CVS-2002-11-10 PHP Bug Type: Math related Bug description: Computation Error On this one, I really don't have a clue what is wrong with PHP. Run the script shown below. Results should be "c" == "d" == "e", but "e" is some other value. I noticed that if you comment out the "$temp_x = ..." line (which shouldn't matter anyway) you get the correct answer for "e". I need this to convert a vector to unit length (which should be simple enough) and I thought that I was going crazy. If you want to see how PHP is configured, look here: http://144.92.10.251/~sage/test.php <?php $temp_x = .0663; $temp_y = .01486; print "a=" . $temp_x . ", b=" . $temp_y . ", c=" . (.0148 / sqrt( .0663 * .0663 + .01486 * .01486 ) ) . ", d=" . ($temp_y / sqrt( ( $temp_x * $temp_x ) + ( $temp_y * $temp_y ) )); $temp_x = $temp_x / sqrt(($temp_x * $temp_x ) + ( $temp_y * $temp_y ) ); $temp_y = $temp_y / sqrt(($temp_x * $temp_x ) + ( $temp_y * $temp_y ) ); echo ", e=" . $temp_y; ?> -- Edit bug report at http://bugs.php.net/?id=20346&edit=1 -- Try a CVS snapshot: http://bugs.php.net/fix.php?id=20346&r=trysnapshot Fixed in CVS: http://bugs.php.net/fix.php?id=20346&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=20346&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=20346&r=needtrace Try newer version: http://bugs.php.net/fix.php?id=20346&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=20346&r=support Expected behavior: http://bugs.php.net/fix.php?id=20346&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=20346&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=20346&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=20346&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=20346&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=20346&r=dst IIS Stability: http://bugs.php.net/fix.php?id=20346&r=isapi