Finding coefficients of quadratic equation without Symbolic Toolbox.

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Swasti Khuntia
Swasti Khuntia 2012-9-17
I have an equation in the form X = Y/(Y + A + BY + CY^2), where X and Y are known. I need to find out the coefficients A, B and C. And, I don't have the Symbolic Toolbox. I tried it using the polyfit function but was unsuccessful. I have a matrix from where I can extract the values for X and Y.
Any suggestions??
Thanks

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回答（1 个）

José-Luis
José-Luis 2012-9-17
You don't really need the symbolic toolbox for that. For instance, one of the solutions will always be a = y/x, b = -1 and c = 0. If you need more solutions then you just plug in whatever you want to two of the three coefficients and calculate the last one.

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