dcrevier@jarthur.Claremont.EDU (Dan Crevier) (08/22/90)
The following problem is for the 48SX: I want to use Wayne Scotts poly root program to find the roots of the polynomial, but I have the equation in the form of an algebraic, and the polyroot program wants the the coefficents in a list. So, what I want to do is find the coefficients of the different terms. I was thinking I could do it by setting the variable (X) to 0, evaluating the algebraic to get the constant term, subracting the constant term, dividing the algebraic by X, using the algebra expand and collect commands(so that it won't have the /X in there and get a divide by 0 errer), and then reevaluate the expression to get the X term. I would continue this to get all of the coefficients, and then make a list. This seems like it would be really slow, and I would have to worry about purging and creating X at the right times. Does anyone know a better way to do this? BTW, the reason I am doing this is because I have written a program to find the characteristic polynomial of a matrix. Using the polyroot program, you get the Eigenvalues of the matrix. I'll upload it once I get a serial cable (which should be soon). Dan
jurjen@cwi.nl (Jurjen NE Bos) (08/22/90)
dcrevier@jarthur.Claremont.EDU (Dan Crevier) writes: >The following problem is for the 48SX: >I want to use Wayne Scotts poly root program to find the roots of the >polynomial, but I have the equation in the form of an algebraic, and the >polyroot program wants the the coefficents in a list. So, what I want to do >is find the coefficients of the different terms. I was thinking I could do >it by setting the variable (X) to 0, evaluating the algebraic to get the I guess that what you need are the TAYLR and ALG\-> commands. Bye, -- | | "Never imagine yourself not to be otherwise than what | | Jurjen N.E. Bos | it might appear to others that what you were or might | | | have been was not otherwise than what you had been | | jurjen@cwi.nl | would have appeared to them to be otherwise." |