本人SAS菜鸟一枚，请教各位大神，下面一段代码是什么意思，为何运行不了？麻烦各位大神解答，不胜感激！

Proc iml;

use FLDsets.FL_Data;
read all var { &list_of_faultline_variables } into m_fldata;
n_rows=nrow(m_fldata);
n_cols=ncol(m_fldata);

use FLDsets.FL_Data;
read all var { &group_id_variable } into groupid;

use FLDsets.FL_Rescaling;
read all var { &list_of_faultline_variables } into m_flrescaling;

create FLDsets.m_fldata from m_fldata;
append from m_fldata;
close FLDsets.m_fldata;

m_flrsdata = J(n_rows, n_cols, 0);
Do K = 1 to n_cols;
        Do I = 1 to n_rows;
      m_flrsdata[I,K] = m_fldata[I,K] * m_flrescaling[1,K];
        End;
End;

create FLDsets.m_flrsdata from m_flrsdata;
append from m_flrsdata;
close FLDsets.m_flrsdata;