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Question: How do I correct 'in plots / implicitplot / factor' error in Maple?

Question:How do I correct 'in plots / implicitplot / factor' error in Maple?

OLOWE RUTH 5 Maple 2023
linearalgebra homework plotting
December 19 2023
0

 I have been trying to run a code to plot a region of stability for a numerical method for solving IVPs. Apart from the fact that it is taking time to run, it is giving me errors: 'Error; (inplots/ implicitplot/factor) and  Error; (inplot/ iplot2d:-Levels ) could not evaluate expression' 

 Attached here is the code:

K=4

NULL

with(LinearAlgebra):

NULL

P1 := simplify(A1-ScalarMultiply(A3, z)-ScalarMultiply(A5, z^3)):

Error, (in plots/implicitplot/factor) invalid input: the following extra unknowns were found in the input expression: {P5[4]}

Error, (in plot/iplot2d:-Levels) could not evaluate expression

NULL

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