If I run this code:

```
sysuse auto, clear
tab rep78 foreign, nofreq row matcell(freqs)
matrix list freqs
```

it's clear that tab only saved the actual counts in each cell, not the frequencies that were calculated and displayed with the nofreq row options. How do I save these relative frequencies in a matrix? I can back them out manually, but since Stata has already calculated them, there should be a way to save them.

Also posted on Statalist.

Answer:

You can manipulate matrices in Stata, but Mata is richer for this purpose. It can be used calculator-style.

```
. sysuse auto, clear
(1978 Automobile Data)
. tab rep78 foreign, nofreq row matcell(freqs)
Repair |
Record | Car type
1978 | Domestic Foreign | Total
-----------+----------------------+----------
1 | 100.00 0.00 | 100.00
2 | 100.00 0.00 | 100.00
3 | 90.00 10.00 | 100.00
4 | 50.00 50.00 | 100.00
5 | 18.18 81.82 | 100.00
-----------+----------------------+----------
Total | 69.57 30.43 | 100.00
. matrix list freqs
freqs[5,2]
c1 c2
r1 2 0
r2 8 0
r3 27 3
r4 9 9
r5 2 9
. mata
: freqs = st_matrix("freqs")
: freqs :/ rowsum(freqs)
: freqs :/ colsum(freqs)
```

You can push any of these matrices back to Stata, naturally.

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