Description Usage Arguments Details Value Author(s) See Also Examples
Build a symmetric matrix representing a quadratic polynomial in two variables.
1 | conicMatrix(v)
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v |
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The v
argument is a 6-length vector containing the
coefficients of a quadratic polynomial of the form:
1 | P(x_1,x_2) = v_1 x_1^2 + v_2 x_1 x_2 + v_3 x_2^2 + v_4 x_1 + v_5 x_2 + v_6
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The associated quadratic form is:
1 | Q(x_1,x_2,x_3) = v_1 x_1^2 + v_2 x_1 x_2 + v_3 x_2^2 + v_4 x_1 x_3 + v_5 x_2 x_3 + v_6 x_3^2
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Return the symmetric 3x3 matrix representing the associated quadratic form.
Bernard Desgraupes
bernard.desgraupes@u-paris10.fr
University of Paris Ouest - Nanterre
Lab Modal'X (EA 3454)
conicAsymptotes
,
conicAxes
,
conicCenter
,
conicPlot
1 2 3 | # Equation: 2*x_1^2 + 2*x_1*x_2 + 2*x_2^2 - 20*x_1 - 28*x_2 + 10 = 0
v <- c(2,2,2,-20,-28,10)
conicMatrix(v)
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