Re: negative infinity is unreachable

Robert, I tried the settype() and it seems to be the route to take. I now get a few of the image lines to appear, and I'll work on it until I get them all going. Thanks hugh ----- Original Message ----- From: Robert V. Zwink <rzwink@microcenter.com> To: Hugh Danaher <hdanaher@earthlink.net>; Php-General <php-general@lists.php.net> Sent: Wednesday, September 05, 2001 1:38 PM Subject: RE: [PHP] negative infinity is unreachable > I believe your problem is due to ambiguous type casting. Your if statement > tests a DOUBLE against a STRING. Try: > > $x_distance=20+($year-($current_year-9))*20; > $high_distance=420-round(log($high[$year])*75,0); > $low_distance=420-round(log($low[$year])*75,0); > settype($high_distance, "string"); > settype($low_distance, "string"); > > Or add this line to your code to see what I'm talking about: > echo "High distance ".gettype ($high_distance)." $high_distance<BR>"; > echo "Low distance ".gettype ($low_distance)." $low_distance<BR>"; > > Will show that $high_distance and $low_distance are of type DOUBLE. > > I'm not sure how this will affect your calculation, but the if condition > will at least evaluate to TRUE when $high_distance or $low_distance == > "INF", you can try to remove the quotation marks, it didn't work for me > though. The only way I could get it to work was by changing the type. > > Maybe your could change your if condition: > if(gettype($variable_name)=="DOUBLE"){ . . . > > > Hope this helps! > Robert Zwink > http://www.zwink.net/daid.php > > > -----Original Message----- > From: Hugh Danaher [mailto:hdanaher@earthlink.net] > Sent: Wednesday, September 05, 2001 3:46 PM > To: Php-General > Subject: [PHP] negative infinity is unreachable > > > HELP! > > I have been trying variations of the code posted below with little success. > The log() function generates a -INF statement when trying to calculate the > log of zero or the log of an empty value in the associative array. With the > "IF then unset() " statements in place, the total contents of log_high[] and > log_low[] arrays become empty. Without the "IF then unset()" statements the > arrays are full but the program times out because it can't use INF in > imageline(). I've gone through various rewrites on this code block but have > come up with nothing that works, and I need professional help (but that's a > different story). > > Thanks, > hugh > > Failing code: > > for ($year=($current_year-5);$year<=($current_year+1);$year++) > { > $x_distance=20+($year-($current_year-9))*20; > $high_distance=420-round(log($high[$year])*75,0); > $low_distance=420-round(log($low[$year])*75,0); > if ($high_distance=="INF") / / INF is a > double > { > unset($high_distance); > } > if ($low_distance=="INF") > { > unset($high_distance); > } > if (isset($high_distance) and isset($low_distance)) > { > > imagettftext($image,5,0,($x_distance),($high_distance),$black,$font2,"n"); > > imagettftext($image,5,0,($x_distance),($low_distance),$black,$font2,"n"); > > imageline($image,$x_distance),$high_distance,($x_distance),$low_distance,$re > d); > } > $log_high[$year]=$high_distance; > $log_low[$year]=$low_distance; > } > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > For additional commands, e-mail: php-general-help@lists.php.net > To contact the list administrators, e-mail: php-list-admin@lists.php.net >