Difference between revisions of "Quadratic form"
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| − | + | '''Quadratic form''' is a function expressed as a multivariable equation in [[linear algebra]] that has only combined power of two. When represented by [[matrices]], it has a geometric significance as a shift or transformation in coordinates. | |
| − | '''Quadratic | ||
A quadratic form ''q('''x''')'' can be written as: | A quadratic form ''q('''x''')'' can be written as: | ||
Revision as of 04:19, July 19, 2016
Quadratic form is a function expressed as a multivariable equation in linear algebra that has only combined power of two. When represented by matrices, it has a geometric significance as a shift or transformation in coordinates.
A quadratic form q(x) can be written as:
- q(x) = x(A x)
where y = A x is the vector resulting from multiplying a matrix and a vector (a linear transformation) and x (y) is the scalar product of vectors.