# rowMeans

From fame v1.03
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##### Form Row Sums and Means

Form row sums and means for numeric arrays.

Keywords
ts, algebra, array
##### Usage
rowSums (x, ...)
rowMeans(x, ...)
## S3 method for class 'default':
rowSums(x, na.rm = FALSE, dims = 1, \dots)
## S3 method for class 'default':
rowMeans(x, na.rm = FALSE, dims = 1, \dots)
## S3 method for class 'tis':
rowSums(x, \dots)
## S3 method for class 'tis':
rowMeans(x, \dots)
##### Arguments
x
an array of two or more dimensions, containing numeric, complex, integer or logical values, or a numeric data frame, or a tis time indexed series
...
arguments passed along to rowSums.default or rowMeans.default, which are actually the versions of rowSums and rowMeans from the base package. The ...argument is ignored in rowSums.d
na.rm
logical. Should missing values (including NaN) be omitted from the calculations?
dims
Which dimensions are regarded as rows or columns to sum over. For row*, the sum or mean is over dimensions dims+1, ...; for col* it is over dimensions 1:dims
##### Details

These functions are equivalent to use of apply with FUN = mean or FUN = sum with appropriate margins, but are a lot faster. As they are written for speed, they blur over some of the subtleties of NaN and NA. If na.rm = FALSE and either NaN or NA appears in a sum, the result will be one of NaN or NA, but which might be platform-dependent.

##### Value

• A numeric or complex 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.

If there are no values in a range to be summed over (after removing missing values with na.rm = TRUE), that component of the output is set to 0 (rowSums) or NA (rowMeans), consistent with sum and mean.

The tis-specific methods also return a tis.

apply, rowsum, and colSums for more details and examples.

##### Aliases
• rowSums
• rowSums.default
• rowSums.tis
• rowMeans
• rowMeans.default
• rowMeans.tis
##### Examples
mat <- tis(matrix(1:36, ncol = 3), start = latestJanuary())
cbind(mat, rowSums(mat), rowMeans(mat))
Documentation reproduced from package fame, version 1.03, License: Public domain

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