colMax: Find row and column maximum values
In xcms: LC-MS and GC-MS Data Analysis

Description Usage Arguments Details Value Author(s) See Also

Find row and column maximum values for numeric arrays.

colMax(x, na.rm = FALSE, dims = 1)
rowMax(x, na.rm = FALSE, dims = 1)
which.colMax(x, na.rm = FALSE, dims = 1)
which.rowMax(x, na.rm = FALSE, dims = 1)

`x`	an array of two or more dimensions, containing numeric values
`na.rm`	logical. Should missing values (including 'NaN') be omitted from the calculations? (not currently implemented)
`dims`	Which dimensions are regarded as "rows" or "columns" to maximize. For `rowMax`, the maximum is over dimensions `dims+1, ...`; for `colMax` it is over dimensions `1:dims`.

These functions are designed to act like the colSums series of functions except that they only currently handle real arrays and will not remove NA values.

A numeric array of suitable size, or a vector if the result is one-dimensional. The dimnames (or names for a vector result) are taken from the original array.

For the which.* functions, an integer array of suitable size, or a vector if the result is one-dimensional. The indecies returned are for accessing x one-dimensionally (i.e. x[index]). For which.colMax(), the actual row indecies my be determined using (which.colMax(x)-1) %% nrow(x) + 1. For which.rowMax(), the actual column indecies may be determined using ceiling(rowMax(x)/nrow(x)).

Colin A. Smith, csmith@scripps.edu

colSums

xcms documentation built on Nov. 8, 2020, 5:13 p.m.