limma (version 3.28.14)

avereps: Average Over Irregular Replicate Probes

Description

Condense a microarray data object so that values for within-array replicate probes are replaced with their average.

Usage

"avereps"(x, ID=rownames(x), ...)
"avereps"(x, ID=NULL, ...)
"avereps"(x, ID=NULL, ...)

Arguments

x

a matrix-like object, usually a matrix, MAList or EList object.

ID

probe identifier.

...

other arguments are not currently used.

Value

A data object of the same class as x with a row for each unique value of ID.

Details

A new data object is computed in which each probe ID is represented by the average of its replicate spots or features.

For an MAList object, the components M and A are both averaged in this way, as are weights and any matrices found in object$other. For an MAList object, ID defaults to MA$genes$ID is that exists, otherwise to rownames(MA$M).

EList objects are similar, except that the E component is averaged instead of M and A.

If x is of mode "character", then the replicate values are assumed to be equal and the first is taken as the average.

See Also

avedups, avearrays. Also rowsum in the base package. 02.Classes gives an overview of data classes used in LIMMA.

Examples

x <- matrix(rnorm(8*3),8,3)
colnames(x) <- c("S1","S2","S3")
rownames(x) <- c("b","a","a","c","c","b","b","b")
avereps(x)