ds.matrixDet {dsBaseClient}

R Documentation

Calculates de determinant of a matrix in the server-side

Description

Calculates the determinant of a square matrix that is written on the server-side. This operation is only possible if the number of columns and rows of the matrix are the same.

Usage

ds.matrixDet(M1 = NULL, newobj = NULL, logarithm = FALSE, datasources = NULL)

Arguments

M1	a character string specifying the name of the matrix.
newobj	a character string that provides the name for the output variable that is stored on the data servers. Default matrixdet.newobj.
logarithm	logical. If TRUE the logarithm of the modulus of the determinant is calculated. Default FALSE.
datasources	a list of DSConnection-class objects obtained after login. If the datasources argument is not specified the default set of connections will be used: see datashield.connections_default.

Details

Calculates the determinant of a square matrix on the server-side. This function is similar to the native R determinant function.

Server function called: matrixDetDS2

Value

ds.matrixDet returns the determinant of an existing matrix on the server-side. The created new object is stored on the server-side. Also, two validity messages are returned indicating whether the matrix has been created in each data source and if so whether it is in a valid form.

Author(s)

DataSHIELD Development Team

Examples

## Not run: 

 ## Version 6, for version 5 see the Wiki
  
  # connecting to the Opal servers

  require('DSI')
  require('DSOpal')
  require('dsBaseClient')

  builder <- DSI::newDSLoginBuilder()
  builder$append(server = "study1", 
                 url = "http://192.168.56.100:8080/", 
                 user = "administrator", password = "datashield_test&", 
                 table = "CNSIM.CNSIM1", driver = "OpalDriver")
  builder$append(server = "study2", 
                 url = "http://192.168.56.100:8080/", 
                 user = "administrator", password = "datashield_test&", 
                 table = "CNSIM.CNSIM2", driver = "OpalDriver")
  builder$append(server = "study3",
                 url = "http://192.168.56.100:8080/", 
                 user = "administrator", password = "datashield_test&", 
                 table = "CNSIM.CNSIM3", driver = "OpalDriver")
  logindata <- builder$build()
  
  connections <- DSI::datashield.login(logins = logindata, assign = TRUE, symbol = "D") 
  
  #Create the matrix in the server-side
  
  ds.rUnif(samp.size = 9,
           min = -10.5,
           max = 10.5,
           newobj = "ss.vector.9",
           seed.as.integer = 5575,
           force.output.to.k.decimal.places = 0,
           datasources = connections)
           
  ds.matrix(mdata = "ss.vector.9",
            from = "serverside.vector",
            nrows.scalar = 9,ncols.scalar = 9,
            byrow = TRUE,
            newobj = "matrix",
            datasources = connections)
            
  #Calculate the determinant of the matrix
  
  ds.matrixDet(M1 = "matrix", 
               newobj = "matrixDet", 
               logarithm = FALSE, 
               datasources = connections)
  

  
  # clear the Datashield R sessions and logout
  datashield.logout(connections)

## End(Not run)

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