invalid command name ""
    while executing
"$source serialize"
    (procedure "::struct::matrix::_=" line 2)
    invoked from within
"::struct::matrix::_= ::m {}"
    ("uplevel" body line 1)
    invoked from within
"uplevel 1 [linsert $args 0 ::struct::matrix::$sub $name]"
    (procedure "::struct::matrix::MatrixProc" line 20)
    invoked from within
"m = [::csv::read2matrix [open   C:/MyMatrix.tsv] m \t]"