image2: Display a matrix image
In cstubben/genomes2: Genome sequencing project metadata

Description Usage Arguments Details Value Author(s) See Also Examples

Creates a grid of colored rectangles to display a matrix

image2(x, col = rev(heat.colors(24)), breaks, log = FALSE,
 zeroNA=TRUE, sort01=FALSE, all=FALSE, border = NA, box.offset = 0.1,
 round = 3, cex, text.cex = 1, text.col = "black", mar = c(1, 3, 3, 1),
 labels = 2:3, label.offset = 0.1, label.cex = 1)

`x`	A numeric matrix, typically with row and column names
`col`	A vector of colors for boxes
`breaks`	A numeric vector of break points or number of intervals into which `x` is to be `cut`. Default is the length of `col`
`log`	Cut values in `x` using a log scale, default TRUE
`zeroNA`	Set zeros to NA (and color white)
`sort01`	Sort rows in descending order using the entire string of numbers
`all`	Display entire matrix, default is first 50 rows and columns
`border`	The border color for boxes, default is no borders
`box.offset`	Percent reduction in box size (a number between 0 and 1), default is 10% reduction
`round`	Number of decimal places to display values of `x` in each box
`cex`	Magnification size of text and labels, if specified this will replace values in both text.cex and label.cex
`text.cex`	Magnification size of text in cells only
`text.col`	Color of text in cells, use NA to skip text labels
`mar`	Margins on four sides of plot
`labels`	A vector giving sides of the plot (1=bottom, 2=left, 3=top, 4=right) for row and column labels
`label.offset`	Amount of space between label and boxes
`label.cex`	Magnification size of labels

Missing values (NAs) and zeroes are assigned to the color white (unless zeroNA is FALSE) and remaining values are cut into groups and colored using the assigned values.

A image plot of the matrix in x

Chris Stubben

image

## top 20 Genus by year
data(proks)
z<-table2(genus(proks$name), year(proks$released), n=20)
 image2(z[,-ncol(z)], sort=TRUE, mar=c(1,10,3,1), cex=.8)