Description Usage Arguments Details Value Author(s) See Also Examples
Compute Row sums across columns of a numeric matrix-like object for each level of a grouping variable.
1 2 |
M |
a matrix, data frame or vector of numeric data. Missing values are allowed. A numeric vector will be treated as a column vector. |
group |
a vector or factor giving the grouping, with one element per row of M. Default: rownames of M. |
reord |
if TRUE, then the result will be in order of sort(unique(group)), if FALSE (the default), it will be in the order that groups were encountered. |
na_rm |
logical (TRUE or FALSE). Should NA (including NaN) values be discarded? |
big |
is your object big and integer overflow is likely? If TRUE, then M is multiplied by 1.0 to ensure values are of type double (perhaps taking more RAM). |
... |
other arguments to be passed to or from methods. |
This function is a wrapper for base function rowsum
and is its "column" version.
A matrix-like object containing the sums by group. There will be one row per unique value of group.
Albert Dorador
1 2 3 |
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.