st: do loops and mata

[<J.Wadsworth@lse.ac.uk>]

Dear Statalist

As a novice to mata I'm trying to generate a set of 39 matrices using a loop - essentially extracting each row of a larger matrix P sequentially and then transforming the vector into a matrix using the rowshape command

I've got as far as this - which does indeed scroll through a matrix P 39 times and extract a row at a time and writes to a mtrix Pi, but then it overwrites the matrix Pi each time so that I'm left with just one matrix called Pi at the end of the loop instead of 39 matrics called P1--P39

Does anyone know how to adapt the code below to generate and store 39 different matrices named p1, p2, ..p39 ?

Many thanks in advance

Jonathan Wadsworth



mata


P = st_data( ., ("ee", "eu" ,"ue", "uu") )  
P

for ( i=1; i<=rows(P) ;i++) {              

Pi= P[i,.]             
Pi

xi=rowshape( Pi, 2)                         
xi

}

end


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