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Question: sorting a symbolic expressions

Question:sorting a symbolic expressions

Physicist 110 Maple
August 12 2008
0
Hello, I have an equation: y^2=4x^2 (My equation is more complicated. This is just an example) I want to define a function: f(x) = y1 - y2, where y1 and y2 are the roots of the equation in a descending order and then to plot f(x). I tried to do it as follows: S := (x) -> sort([solve(y^2 = 4*x^2, y)],`>`) C := (x) -> S(x)[1]-S(x)[2] plot(C(x), x = 0 .. 5) and I had an error "Error, (in S) invalid arguments to sort" When I remove the `>` option in "sort" it works. I tried to use "descending" instead of "`>`" as the Maple Help says but I've got another error "Error, (in S) sort: 2nd argument must be a function that always returns true or false" Can someone help?
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