Applying combn() function to data frame?

Question

so I have a data frame containing certain type of data for different stocks, sample as followed:

Date     RY    TD     BNS...
10-01   2.98   2.29   1.91
10-02            


        

Answer 1

As suggested by Alistaire, apply can be easily used for this

apply(df[, -1], 1, function(x) {
     sum(combn(x, 2, prod))
}
)

You could also use package parallel and use mcapply* functions to run it in multicore modes