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seen May 24 '13 at 22:00

Self learning


Apr
12
awarded  Popular Question
Dec
14
comment How can Mathematica solve this set of differential equations?
@MarkMcClure After adding initial values. I get the following result: x(t) -> InterpolatingFunction[(0,0),<>](t) y(t) -> InterpolatingFunction[(0,0),<>](t) z(t) -> InterpolatingFunction[(0,0),<>](t) What does that mean? I looked Interpolationg function up, and it didn't gave me much of a clue..
Dec
14
comment How can Mathematica solve this set of differential equations?
@MarkMcClure, I just added an n. Doing this gives me an error NDSolve::ndnco: "The number of constraints (0) (initial conditions) is not equal to the total differential order of the system plus the number of discrete variables (3)." When i add initial conditions I get a really odd result, something with interpolating functions..? (not copyable for some reason..)
Dec
14
revised How can Mathematica solve this set of differential equations?
added 1 characters in body
Dec
14
comment How can Mathematica solve this set of differential equations?
@MarkMcClure yes, I know it's non-linear, but I also tried the NDSolve, which still got me nowhere...
Dec
14
asked How can Mathematica solve this set of differential equations?
Oct
25
comment Can mathematica simplify an expression setting simplified answer equal to zero?
But still using that method, when I define a, I want it to fly to the left hand side... as I now know this value it's no longer unknown? Does that make sence? The thing is.. have all these equations ´where a-b==c*d´ and I'm trying to build a matrix, therefore i need to have knowns on one side, and unknowns on the other side. see this: i.imgur.com/jgzo7.png
Oct
25
awarded  Student
Oct
25
comment Can mathematica simplify an expression setting simplified answer equal to zero?
i have : a - b == c * d c = 1, therefore, by simplifying mathematica outputs: a = d + b Can i output that as 0 = (d+b)/a ? ------------------------------ All known on one side, all unkown on the other side...
Oct
25
comment Can mathematica simplify an expression setting simplified answer equal to zero?
Yeah, but I also have some expressions which equal 1, and I do not want that moved over setting everything to equal zero... Basically I want all unknown on one side. And all that's known (defined) on the other side..
Oct
25
awarded  Editor
Oct
25
revised Can mathematica simplify an expression setting simplified answer equal to zero?
edited title
Oct
25
comment Can mathematica simplify an expression setting simplified answer equal to zero?
Yeah I tried that... But how can you tell it to reduce so you have constants on one side ?
Oct
25
asked Can mathematica simplify an expression setting simplified answer equal to zero?