POLYROOT does not always work inside a program - Printable Version +- HP Prime Forum ( http://forum.hp-prime.de)+-- Forum: HP Prime ( /forumdisplay.php?fid=1)+--- Forum: Questions to HP ( /forumdisplay.php?fid=3)+--- Thread: POLYROOT does not always work inside a program ( /showthread.php?tid=48) |

POLYROOT does not always work inside a program - JMB - 04-01-2016 07:05 PM
I have found a strange behavior (a bug?) while using the function POLYROOT inside a program. My firmware version is 2015 6 17 (8151). The calculator's built-in help states that the argument of this function can be either a symbolic expression or a vector of coefficients, but I have found that a list of coefficients also works as the function's argument. So both POLYROOT([1 -3 2]) and POLYROOT({1, -3, 2}) return the same answer: {1, 2}, in Home and in CAS. The problem arises when I use this function inside a program, for example: EXPORT Test() BEGIN POLYROOT([1, -3, 2]); END; The first thing worth noting in that commas are needed inside [ ], otherwise you get a syntax error when you tap the Check button. Then when you run the program you get the following error message: Test "POLYROOT(ListToMat(EVAL LIST({0,1,3,1-3,2}))) Error: Bad Argument Value)" After trying different numeric values, I have found that this error only happens inside a program, when using [ ] and at least one value is negative. So we have, for example: POLYROOT({1, 3, 2}): correct answer {-2, -1} POLYROOT([1, 3, 2]): correct answer {-2, -1} POLYROOT({1, -3, 2}): correct answer {1, 2} POLYROOT([1, -3, 2]): error, as stated before RE: POLYROOT does not always work inside a program - JMB - 30-04-2016 11:56 AM
Corrected in firmware 10077. Thanks to the HP Prime Team! RE: POLYROOT does not always work inside a program - Klaas Kuperus - 02-05-2016 04:34 PM
Thanks for the update! |