短語詞組短語scalar r matrix 標(biāo)量矩陣Scalar identity covariance matrix 純量單位矩陣式共變量scalar multiplication of matrix 矩陣的數(shù)乘scalar multiplication of a matrix 矩陣的數(shù)乘Matrix scalar operations 矩陣的標(biāo)量運(yùn)算matrix scalar product 矩陣的標(biāo)量乘積Scalar -by-matrix identities 標(biāo)量矩陣matrix of scalar product 純量積矩陣;純量積的陣 返回 scalar matrix