why need to?  It's symmetric.   If you do need, you have to put the corr into matrix, so after running corr, using

mat C=r(C)
mat list C, coha

Many thanks! I will try to see how far I can get.
well, in my project, I have to calculate each company's average pairwise correlation with other companies, so it would be very helpful (I think) if the result can show the right upper corner's symmetric values, since I don't know much about stata. Again, appreciate your kindly help.

you are welcome, thanks!

Having the same problem after probably a year ago,
mat list C,coha,i found that coha is not a permitted commnad of matrix command.
in Stata12 the right way to do is
mat list C ,nohalf
it would show full correlation matrix for you.

@chyiping520  正解， cohalf应该是打错了，确实得用nohalf