.. _docs-meteoinfolab-numeric-funcitons-corrcoef: ******************* corrcoef ******************* .. currentmodule:: mipylib.numeric.minum .. function:: corrcoef(x, y) Return Pearson product-moment correlation coefficients. The relationship between the correlation coefficient matrix, R, and the covariance matrix, C, is .. math:: R_{ij} = \frac{C_{ij}} {\sqrt{C_{ii} * C_{jj}}} The values of R are between -1 and 1, inclusive. :param x: (*array_like*) A 1-D or 2-D array containing multiple variables and observations. Each row of x represents a variable, and each column a single observation of all those variables. :param y: (*array_like*) An additional set of variables and observations. y has the same shape as x. :returns: The correlation coefficient matrix of the variables. **Examples** :: y = [29.81,30.04,41.7,43.71,28.75,37.73,52.25,32.41,25.67,28.17,25.71,36.05,37.62,34.28,38.82,40.15,35.69,28.36,39.56,52.56,54.14,50.76,39.35,43.16] x = [51.6,46,64.3,83.4,65.9,49.5,88.6,101.4,55.9,41.8,33.4,57.3,66.5,40.5,72.3,70,83.3,65.8,63.1,83.4,102,94,77,77] r = corrcoef(x, y) print r y1 = array(x) * 2 r1 = corrcoef(x, y1) print r1 Output: :: >>> run script... array([[1.0, 0.7007980346679688] [0.7007980346679688, 1.0]]) array([[1.0, 1.0] [1.0, 1.0]])