Static method asserting thatan object is a matrix.
## Static method (use this):
## Assert$isMatrix(x, nrow=NULL, ncol=NULL, ...)## Don't use the below:
# S3 method for Assert
isMatrix(static, x, nrow=NULL, ncol=NULL, ...)
Object to be checked.
Required number of rows. If NULL, this is not checked.
Required number of columns. If NULL, this is not checked.
Not used.
Returns (invisibly) TRUE, or throws an exception.
For more information see Assert.