# grid.function

0th

Percentile

##### Draw a curve representing a function

Draw a curve representing a function.

Keywords
dplot
##### Usage
grid.function(...)
functionGrob(f, n = 101, range = "x", units = "native",
name = NULL, gp=gpar(), vp = NULL)grid.abline(intercept, slope, ...)
##### Arguments
f

A function that must take a single argument and return a list with two numeric components named x and y.

n

The number values that will be generated as input to the function f.

range

Either "x", "y", or a numeric vector. See the ‘Details’ section.

units

A string indicating the units to use for the x and y values generated by the function.

intercept

Numeric.

slope

Numeric.

Arguments passed to grid.function()

name

A character identifier.

gp

An object of class gpar, typically the output from a call to the function gpar. This is basically a list of graphical parameter settings.

vp

A Grid viewport object (or NULL).

##### Details

n values are generated and passed to the function f and a series of lines are drawn through the resulting x and y values.

The generation of the n values depends on the value of range. In the default case, dim is "x", which means that a set of x values are generated covering the range of the current viewport scale in the x-dimension. If dim is "y" then values are generated from the current y-scale instead. If range is a numeric vector, then values are generated from that range.

grid.abline() provides a simple front-end for a straight line parameterized by intercept and slope.

##### Value

A functiongrob grob.

Grid, viewport

##### Aliases
• grid.function
• functionGrob
• grid.abline
##### Examples
library(grid) # NOT RUN { # abline # NOTE: in ROOT viewport on screen, (0, 0) at top-left # and "native" is pixels! grid.function(function(x) list(x=x, y=0 + 1*x)) # a more "normal" viewport with default normalized "native" coords grid.newpage() pushViewport(viewport()) grid.function(function(x) list(x=x, y=0 + 1*x)) # slightly simpler grid.newpage() pushViewport(viewport()) grid.abline() # sine curve grid.newpage() pushViewport(viewport(xscale=c(0, 2*pi), yscale=c(-1, 1))) grid.function(function(x) list(x=x, y=sin(x))) # constrained sine curve grid.newpage() pushViewport(viewport(xscale=c(0, 2*pi), yscale=c(-1, 1))) grid.function(function(x) list(x=x, y=sin(x)), range=0:1) # inverse sine curve grid.newpage() pushViewport(viewport(xscale=c(-1, 1), yscale=c(0, 2*pi))) grid.function(function(y) list(x=sin(y), y=y), range="y") # parametric function grid.newpage() pushViewport(viewport(xscale=c(-1, 1), yscale=c(-1, 1))) grid.function(function(t) list(x=cos(t), y=sin(t)), range=c(0, 9*pi/5)) # physical abline grid.newpage() grid.function(function(x) list(x=x, y=0 + 1*x), units="in") # } 
Documentation reproduced from package grid, version 3.5.3, License: Part of R 3.5.3

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