HP 42S Question
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02-03-2019, 08:17 PM
Post: #1
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HP 42S Question
I use a neat program for finding extremums by solving to find when d/dx=0. The derivative program goes like this
LBL "DX" MVAR "X" MVAR "H" RCL "X" RCL "H" COMPLEX XEQ "FX" COMPLEX END This works in solve for most routine functions ("FX"). I am having a problem with a more complicated function, where the program for the function ("FX") executes successfully, but my derivative function ("DX") will not work in solve (generates an "invalid type" error). An example is the following program "(FX") which executes successfully, but not in the solver in program "DX" LBL "FX" ENTER ENTER ENTER X^2 5 - X<0? +/- SQRT END Is there a way to handle this sort of thing where the DX program can work in solve? |
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Messages In This Thread |
HP 42S Question - lrdheat - 02-03-2019 08:17 PM
RE: HP 42S Question - lrdheat - 02-03-2019, 08:18 PM
RE: HP 42S Question - Thomas Okken - 02-03-2019, 09:38 PM
RE: HP 42S Question - lrdheat - 02-03-2019, 10:02 PM
RE: HP 42S Question - Thomas Okken - 02-03-2019, 10:11 PM
RE: HP 42S Question - Thomas Klemm - 02-04-2019, 05:47 AM
RE: HP 42S Question - lrdheat - 02-04-2019, 03:07 PM
RE: HP 42S Question - SammysHP - 02-04-2019, 05:39 PM
RE: HP 42S Question - lrdheat - 02-05-2019, 06:15 AM
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