Matrix Command Summary
    colplace	Places column vector into matrix.
 
    matplace	Places matrix object in another matrix object.
 
    mtos	Converts a matrix object to series or group.
 
    nrnd	Fill the matrix with normal random numbers .
 
    rmvnorm	Fill the matrix with multivariate normal random numbers.
 
    rnd	Fill the matrix with uniform random numbers.
 
    rndint	Fill the matrix with random integers numbers.
 
    rowplace	Places a rowvector in matrix object.
 
    stom	Converts series or group to vector or matrix after removing observations with NAs.
 
    stomna	Converts series or group to vector or matrix without removing observations with NAs.
 
    ttom	Fills a matrix with the numeric contents of a table.