matrix operation not found

[Zuhumnan Dapel]

Dear All,
I need some advice on how to deal with an error:

matrix operation not found

I get the error after running this command (this is an excerpt).

qui tab povub80 povub85 [aw= popw], matcell(povub`i'_all)
mat povub`i'_all=100*povub`i'_all/ r(N) // get percentage
}

*OBTAINING AVERAGE
local i= 2
while `i'<= 500 {
    local j= `i' - 1
    mat povub`i'_all= povub`i'_all + povub`j'_all    
    local i= `i' + 1
}

local j= `i' - 1
local char "_all"
foreach x of local char {
mat povub`j'`x'= povub`j'`x'/`j'
mat rown povub`j'`x'= poor80 nonpoor80
mat coln povub`j'`x'= poor85 nonpoor85
}

mat povub80 povub85_all`m'= povub`j'_all

mat li povub1_all
mat li povub`j'_all

Thanks,
Dapel

[Nick Cox]

 
 mat povub80 povub85_all`m'= povub`j'_all

is a puzzle to me. What do you want that to do?