provide: Restrict Variables to a Local Block

In STAT-UP/statupinternal: STAT-UP Utility Functions

Description

More to come

Usage

provide(..., .expr = NULL, .exports = NULL, .conditions = NULL,
  .env = parent.frame(), .quiet = FALSE)

Arguments

...	Object definitions and the main expression.
.expr	Expression to evaluate. By default the last element of ...
.exports	List of objects to export. By default taken from everything but the last element of ...
.conditions	List of conditions to check. Usually defined in ...
.env	Environment. Where to provide the objects. By default the environment where the function was executed.
.quiet	Logical. Should the exports be printed to stdout?

Examples

# This provides X and Y. The variables a and beta are not exported
# as they are not specified in ...
provide(
  X = list(dim(X) == c(100,4),
           is.numeric(X)),
  Y,
  NROW(Y)==NROW(X),
  {
    a <- 4

    X <- matrix(rnorm(100*a), ncol=a)
    beta <- rnorm(a)

    Y <- X %*% beta + rnorm(100)
  }
)

STAT-UP/statupinternal documentation built on May 9, 2019, 11:43 a.m.