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Unformatted text preview: Vector algebra. Combining two changes of posi-tion corresponds to adding components. Vectors can also be subtracted, and there is a ~ 0 vector. Multi-plying vectors by numbers other than 1 rescales the vectors and sometimes reverses them. Vector algebra has many of the properties of algebra with numbers. Magnitude and direction. The length of a vector is the square-root of the sum of the squares of its (standard) components. Each vector, except ~ 0, can be factored in the form ~ b = b b , where the number b is the magnitude of the vector ~ b , and the unit vector b gives the direction of ~ b . Standard basis vectors. All vectors in R 3 are linear combinations of the unit vectors i , j and k . The End 8 January 2007...
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- Spring '03