contrast_parser: helper function to calculate contrasts of one or more images...

In ggbrain: Create Images of Volumetric Brain Data in NIfTI Format Using 'ggplot2' Syntax

helper function to calculate contrasts of one or more images using a combination of image arithmetic and logical subsetting

Description

helper function to calculate contrasts of one or more images using a combination of image arithmetic and logical subsetting

Usage

contrast_parser(expr, data = NULL, default_val = NA_real_)

Arguments

expr	a string or expression containing the image calculation to be performed
data	a data.frame containing all variables used in expr. This will be used to perform contrast calculations
default_val	the value to be returned for any element of the contrast calculation that does not pass through the arithmetic, either because of logical subsetting or because it is exactly zero. In general, leave this as NA_real_ unless you know what you're doing.

Author(s)

Michael Hallquist

ggbrain documentation built on April 4, 2025, 5:03 a.m.