The-Dream, the R&B singer and behind-the-scenes power player, recently boasted of a $15 million payday for writing Rihanna's 2007 smash Umbrella. True? When you have a cross-over song, it just makes more and more and more money, says Tom DeSavia, a vice president at Notable Music, a 50-year-old music publisher founded by the late songwriter Cy Coleman.
Simple guide to confusion matrix terminology. A confusion matrix is a table that is often used to describe the performance of a classification model (or classifier) on a set of test data for which the true values are known.The confusion matrix itself is relatively simple to understand, but the related terminology can be confusing. wanted to create a quick reference guide for confusion matrix terminology because I couldn't find an existing resource that suited my requirements: compact in presentation, using numbers instead of arbitrary variables, and explained both in terms of formulas and sentences.
Otherwise, a skew-symmetric matrix is just the same thing as a symmetric matrix. Sums and scalar multiples of skew-symmetric matrices are again skew-symmetric. Hence, the skew-symmetric matrices form a vector space. Its dimension is n (n â1)/2.Let Mat n denote the space of n Ã n matrices.A skew-symmetric matrix is determined by n (n â 1)/2 scalars (the number of entries above the main diagonal); a symmetric matrix is determined by n (n + 1)/2 scalars (the number of entries on or above the main diagonal).ore generally, every complex skew-symmetric matrix can be written in the form A = U Ï U T where U is unitary and Ï has the block-diagonal form given above with complex Î» k. This is an example of the Youla decomposition of a complex square matrix.