mgc.sims.step {mgc}

Step Function Simulation

Description

A function for Generating a step function simulation.

Usage

mgc.sims.step(n, d, eps = 1, ind = FALSE, a = -1, b = 1)

Arguments

n

the number of samples for the simulation.

d

the number of dimensions for the simulation setting.

eps

the noise level for the simulation. Defaults to 1.

ind

whether to sample x and y independently. Defaults to FALSE.

a

the lower limit for the data matrix. Defaults to -1.

b

the upper limit for the data matrix. Defaults to -1.

Value

a list containing the following:

X

[n, d] the data matrix with n samples in d dimensions.

Y

[n] the response array.

Details

Given: w_i = \frac{1}{i} is a weight-vector that scales with the dimensionality. Simulates n points from Step(X, Y) \in \mathbf{R}^d\times \mathbf{R} where:

X \sim {U}\left(a, b\right)^d

,

Y = \mathbf{I}\left\{w^TX > 0\right\} + \kappa \epsilon N(0, 1)

and \kappa = 1\textrm{ if }d = 1, \textrm{ and 0 otherwise} controls the noise for higher dimensions.

For more details see the help vignette: vignette("sims", package = "mgc")

Author(s)

Eric Bridgeford

Examples

library(mgc)
result  <- mgc.sims.step(n=100, d=10)  # simulate 100 samples in 10 dimensions
X <- result$X; Y <- result$Y