Maxima Function
cov1 (matrix)
The covariance matrix of the multivariate sample, defined as
n ==== 1 \ _ _ S = --- > (X - X) (X - X)' 1 n-1 / j j ==== j = 1
X_j is the j-th row of the sample matrix.
Example:
(%i1) load (descriptive)$ (%i2) load (numericalio)$ (%i3) s2 : read_matrix (file_search ("wind.data"))$ (%i4) fpprintprec : 7$ /* change precision for pretty output */ (%i5) cov1 (s2); [ 17.39587 13.75567 14.51734 19.59216 15.5774 ] [ ] [ 13.75567 15.13913 13.43887 15.31145 15.12232 ] [ ] (%o5) [ 14.51734 13.43887 15.63205 17.50044 16.34516 ] [ ] [ 19.59216 15.31145 17.50044 32.50153 20.65338 ] [ ] [ 15.5774 15.12232 16.34516 20.65338 24.66977 ]