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.
In linear algebra, a symmetric matrix is a square matrix that is equal to its transpose. Formally, matrix A is symmetric if. Because equal matrices have equal dimensions, only square matrices can be symmetric. The entries of a symmetric matrix are symmetric with respect to the main diagonal.So if the entries are written as A = (a ij), then a ij = a ji, for all indices i and j. The following 3Ã3 matrix is symmetric: Every square diagonal matrix is symmetric, since all off-diagonal entries are zero.Similarly, each diagonal element of a skew-symmetric matrix must be zero, since each is its own negative. In linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.n linear algebra, a symmetric matrix is a square matrix that is equal to its transpose. Formally, matrix A is symmetric if. Because equal matrices have equal dimensions, only square matrices can be symmetric. The entries of a symmetric matrix are symmetric with respect to the main diagonal.