Description

dcSparseMatrix is supposed to create a sparse matrix for an input file with three columns.

Usage

dcSparseMatrix(input.file, verbose = T)

Arguments

input.file

an input file containing three columns: 1st column for rows, 2nd for columns, and 3rd for numeric values. Alternatively, the input.file can be a matrix or data frame, assuming that input file has been read. Note: the file should use the tab delimiter as the field separator between columns

verbose

logical to indicate whether the messages will be displayed in the screen. By default, it sets to TRUE for display

Value

a list containing arguments and their default values

Note

None

Examples

# create a sparse matrix of 4 X 2
input.file <- rbind(c('R1','C1',1), c('R2','C1',1), c('R2','C2',1),
c('R3','C2',1), c('R4','C1',1))
res <- dcSparseMatrix(input.file)

Load the input data matrix of 5 X 3 ...
There are 5 entries, converted into a sparse matrix of 4 X 2.
res

4 x 2 sparse Matrix of class "dgCMatrix"
   C1 C2
R1  1  .
R2  1  1
R3  .  1
R4  1  .

# get a full matrix
as.matrix(res)

   C1 C2
R1  1  0
R2  1  1
R3  0  1
R4  1  0

Source code

Source man

See also