Fatal error: Uncaught Error: Call to undefined function HEXtoRGB() in /customers/a/f/c/mathe.zone/httpd.www/functions/f_math.php:2613 Stack trace: #0 /customers/a/f/c/mathe.zone/httpd.www/functions/f_math.php(2478): generateCoordinateSystem(Array, Array, Array, Array, Array) #1 /customers/a/f/c/mathe.zone/httpd.www/functions/f_aufgaben.php(253): plotFunction(Array, Array, Array, Array, Array, Array, Array, 2, Array, 'single-use', 0, 'path') #2 /customers/a/f/c/mathe.zone/httpd.www/php/projektor-aufgabe.php(42): aufgabe_formatieren('Nachfolgend ist...') #3 {main} thrown in /customers/a/f/c/mathe.zone/httpd.www/functions/f_math.php on line 2613