## Saturday, 20 April 2013

### R: Basic Mathematical Functions

R can perform the usual mathematical operations, below are the functions:

Arithmetic
• +    - addition
• -    - subtraction
• *    - multiplication
• /    - division

Trigonometry
• sin      - sine
• cos      - cosine
• tan      - tangent
• asin    - sine inverse
• acos    - cosine inverse
• atan    - tangent inverse

Linear Algebra
• +            - element-wise addition
• -            - element-wise subtraction
• *            - element-wise multiplication
• /            - element-wise division
• %*%        - matrix multiplication
• t            - transpose
• eigen    - eigenvalues and eigenvectors
• solve    - inverse of matrix
• ginv      - generalized inverse, requires MASS package
• rbind    - combines vectors of observations horizontally into matrix class
• cbind    - combines vectors of observations vertically into matrix class

Reference:
1. Kabacoff, R. I. Matrix Algebra. Quick-R. Retrieved April 20, 2013.
2. Trigonometric Functions. R Documentation. R.2.15.1

## Monday, 1 April 2013

To install a package in R, the function to be used is install.packages. Let say we want to install the ggplot2 package, simply code this with the following:
To install more than one package, utilize the concatenate function, c