is.fullrank {limma} | R Documentation

## Check for Full Column Rank

### Description

Test whether a numeric matrix has full column rank.

### Usage

    is.fullrank(x)

### Arguments

`x` | a numeric matrix for vector

### Details

This function is used to check the integrity of design matrices in limma, for example after subsetting operations.

### Value

`TRUE` or `FALSE`

### Author(s)

Gordon Smyth

### Examples

    # TRUE
    is.fullrank(1)
    is.fullrank(cbind(1,0:1))

    # FALSE
    is.fullrank(0)
    is.fullrank(matrix(1,2,2))

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