Clean up matrices

[Syed Raza]

Hello everyone,

I am trying to understand one code and apparently, everything is clear. But since there has been a lot of working behind the loop and i cannot see line by line what the code does in some of the parts. Here is the part of the code which clears the matrices after running the regression

* Clean up matrices for output
    foreach col in `colnames'  {
        local n=`n'+1
        mat c`n'=var[`n'..., `n']
        local rownames: rown c`n'

        foreach w of local rownames  {
            local rw_c`n' `rw_c`n'' `w'_`col'
        }
        
        matrix rown c`n'= `rw_c`n''
        matrix coln c`n'= `v'
        matrix se=(nullmat(se)\ c`n')
        cap mat drop c`n'
        local rw_c`n' ""
    }

Here col is the columns which are different variables. Can somebody explain me row by row what this code does? For instance, in the last line, i understand local assigned string to macro name but what this is actually doing I don't know. These are 12 lines if you can even explain few I will be grateful. Thanks

Note: v here is local for all the output which are precisely 6 variables means 6 columns.