Linear Algebra Factors

This page lists the built-in methods for linear algebra operations. In these methods, you can often pass in random variables as arguments e.g. Variable<Vector> instead of Vector. For compactness, this is not shown in the syntax below.
 
These methods provide a convenient short alternative to using Variable<T>.Factor and passing in the factor method, as described on this page
 
Operation
Syntax
Description
Inner product
Variable.InnerProduct(Vector a, Vector b)
 
Creates a double random variable equal to the inner product of vectors a and b.
Matrix times vector
Variable.MatrixTimesVector(Matrix a, Vector b)
Creates a Vector random variable equal to product of matrix a and vector b.
Matrix times matrix
Variable.MatrixMultiply(double[,] a, double[,] b)
Creates a double[,] random variable equal to the matrix product of ab.
Sum of elements Variable.Sum(double[] array)
Variable.Sum(IList<double> array)
Creates a double random variable equal to  the sum of the elements of the array.
Conditional sum
of elements
Variable.SumWhere(bool[] a, Vector b)
Creates a double random variable equal to the sum of the elements of b where a is true.
 
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