[R] R-squared, how can I do to put this in a vector?

[Botrel]

I'm needing to remove the R-squared , and put this in a vector. It's the same
that I do with the Beta or alfa in a linear regression:

beta <- vector()  ##  beta

for (i in 1:ncol(ret)){

	beta[i] <- summary(lm((ret[,i] - ret.selic.ibov[,1])  ~ rmrf[,1] +
max[,1]))*$coef[[2]]*
}

So, I need to know what I'll put after* $*.

Thanks.

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