Statistics, Linear Algebra, Probability, and Calculus. Mathematical Concepts . Statistics core part of models. Calculus to learn & optimize a model.
Single variable function: f(x) = x² , whereas multi-variable function: f(x,y) = x² + y. (point on xy graph) (x-y point to a number) [also called single variable calculus]
In multivariable o/p can vector: f(x,y) = [ 3x / 2y ] (x-y point gives vector result - point to a vector [result as vector or matrix]
- dot product returns a number but cross product returns vector
- dot product works in any number of dimensions, cross porduct works only in 3d
- dot product measures how much two vector point in same direction. cross product measures how much two vectors point in different direction.
vector is just a list of numbers. We can write vector as matrices in either (1 x n) format or (n x 1) format
vedtor can be written a 1 x n - one row and n column - example - 1x 3 - [1,4,5] (one row, n column). ABove transposed to n x 1 (n row, 1 column)