Derivatives on HP 42S
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08-24-2018, 02:51 AM
Post: #12
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RE: Derivatives on HP 42S
Hi Thomas,
When trying a more complicated equation: x^(4/3) + 4(x^(1/3)), I get a correct f(x) for all values of x (x=-6, f(x)=3.63, x=-4, f(x)=0 x=0, f(x)=0 x=2, f(x)=7.56) Instead of a min at x=-1, f(x)= -3, my dx program comes up with a min at x=-3. I know that this is probably not a concise program for FX, but it does work for this example. Why is DX not working? LBL FX STO X 4 Y^X 3 1/X Y^X STO B RCL X SIGN STO S RCL X * 3 1/X Y^X 4 * ABS RCL S * RCL B + END LBL DX MVAR A MVAR H RCL A RCL H COMPLEX XEQ FX COMPLEX END Thanks for your time! |
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