barak.utilities.wmean¶

barak.utilities.wmean(val, sig)[source]¶

Return the weighted mean and error. Uses inverse variances as weights.

Parameters :	val : array with shape (N,) Array of values. sig : array with shape (N,) One sigma errors (sqrt(variance)) of the array values.
Returns :	wmean, wsigma : floats The weighted mean and error on the weighted mean.