jvm download

Name: jvm download
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Published: diecockhandvil1988
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R-matrix download.
matrix creates a matrix from the given set of values.
as.matrix attempts to turn its argument into a matrix.
is.matrix tests if its argument is a (strict) matrix.
Usage.
Arguments.
an optional data vector (including a list or expression vector). Non-atomic > R objects are coerced by as.vector and all attributes discarded.
the desired number of rows.
the desired number of columns.
logical. If FALSE (the default) the matrix is filled by columns, otherwise the matrix is filled by rows.
dimnames.
A dimnames attribute for the matrix: NULL or a list of length 2 giving the row and column names respectively. An empty list is treated as NULL , and a list of length one as row names. The list can be named, and the list names will be used as names for the dimensions.
additional arguments to be passed to or from methods.
rownames.force.
logical indicating if the resulting matrix should have character (rather than NULL ) rownames . The default, NA , uses NULL rownames if the data frame has ‘automatic’ row.names or for a zero-row data frame.
Details.
If one of nrow or ncol is not given, an attempt is made to infer it from the length of data and the other parameter. If neither is given, a one-column matrix is returned.
If there are too few elements in data to fill the matrix, then the elements in data are recycled. If data has length zero, NA of an appropriate type is used for atomic vectors ( 0 for raw vectors) and NULL for lists.
is.matrix returns TRUE if x is a vector and has a "dim" attribute of length 2 and FALSE otherwise. Note that a data.frame is not a matrix by this test. The function is generic: you can write methods to handle specific classes of objects, see InternalMethods.
as.matrix is a generic function. The method for data frames will return a character matrix if there is only atomic columns and any non-(numeric/logical/complex) column, applying as.vector to factors and format to other non-character columns. Otherwise, the usual coercion hierarchy (logical as.matrix calls as.vector(x) , and hence e.g. coerces factors to character vectors.
When coercing a vector, it produces a one-column matrix, and promotes the names (if any) of the vector to the rownames of the matrix.
is.matrix is a primitive function.
The print method for a matrix gives a rectangular layout with dimnames or indices. For a list matrix, the entries of length not one are printed in the form integer,7 indicating the type and length.
If you just want to convert a vector to a matrix, something like.
will avoid duplicating x .
References.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language . Wadsworth & Brooks/Cole.

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