Compute the row-wise vector norm

This function is used to compute the row-wise vector norm of X if X is a matrix. If X is a vector (row or column), v is the vector norm.

Usage

norm2(X)

Arguments

X

A data structure, vector or matrix.

Value

The row-wise vector-norm of matrix X, i.e., the square-root of the sum of the squares for each row. If X is a vector (row or column), v is the vector norm and norm2() is equivalent to the built-in function norm(). But if X is a matrix e.g., a triaxial accelerometer or magnetometer matrix, norm() gives the overall norm of the matrix whereas norm2() gives the vector norm of each row (i.e., the field strength in the case of a magnetometer matrix).

Examples

sampleMatrix <- matrix(c(0.2, 0.4, -0.7, -0.3, 1.1, 0.1), byrow = TRUE, nrow = 2, ncol = 3)
norm2(X = sampleMatrix)
#> [1] 0.8306624 1.1445523