Filter a matrix stored in an MDB

Filter a matrix stored in an MDB

Usage

# S3 method for chMDB
filter_mdb_matrix(x, tableName, ...)

# S3 method for fileMDB
filter_mdb_matrix(x, tableName, .by = 10^5, ...)

filter_mdb_matrix(x, tableName, ...)

# S3 method for memoMDB
filter_mdb_matrix(x, tableName, ...)

# S3 method for metaMDB
filter_mdb_matrix(x, tableName, ...)

Arguments

x

an MDB object

tableName

a character vector of length 1 corresponding to the name of the table to filter (must be a matrix)

...

character vectors with the row names and/or columns names to select. The names of the parameters must correspond to the name of the column and of the row fields (the matrix cannot be filtered from values).

.by

the size of the batch: number of lines to process together (default: 10000)

Value

A sub-matrix of tableName in x. Only existing elements are returned. No error is raised if any element is missing. The result must be checked and adapted to user needs.

Examples

if (FALSE) {
## Return the matrix of expression values focused on the selected genes
filter_mdb_matrix(x=db, "Expression_value", gene=c("SNCA", "MAPT"))
}