[R] correlations between columns for each row

[robgriffin247]

Just as an update on this problem:
I have managed to get the variance for the selected columns

Now all I need is the covariance between these 2 selections - 
the two target columns are and the aim is that a new column contain a
covariance value between these on each row: 

maindata[,c(174:213)] and maindata[,c(214:253]

I've played around with all sorts of apply (and derivatives of apply) and in
various different setups so I think I'm close but I feel like I'm chasing my
tail here! 

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