rowProds: Calculates the product for each row (column) in a matrix
In matrixStats: Methods that apply to rows and columns of a matrix

Description Usage Arguments Details Value Missing values Author(s)

Calculates the product for each row (column) in a matrix.

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 rowProds(x, na.rm=FALSE, method=c("expSumLog", "direct"), ...)
 colProds(x, na.rm=FALSE, method=c("expSumLog", "direct"), ...)
 product(x, na.rm=FALSE, ...)

`x`	A `numeric` NxK `matrix`.
`na.rm`	If `TRUE`, missing values are ignored, otherwise not.
`method`	A `character` string specifying how each product is calculated.
`...`	Not used.

If method="expSumLog", then then product() function is used, which calculates the produce via the logarithmic transform (treating negative values specially). This improves the precision and lowers the risk for numeric overflow. If method="direct", the direct product is calculated via the prod() function.

Returns a numeric vector of length N (K).

Note, if method="expSumLog", na.rm=FALSE, and x contains missing values (NA or NaN), then the calculated value is also missing value. Note that it depends on platform whether NaN or NA is returned when an NaN exists, cf. is.nan().

Henrik Bengtsson

matrixStats documentation built on May 2, 2019, 4:52 p.m.