[R] How to separate a function by 2 probabilities

[Marcio Resende]

Good Mourning,
I have a function to generate a matrix as I show part of it;

g[j,i]<-if (gen[j,i]==0) al1[i,1]+al1[i,1] else ...

However i would like that this function occurred with a probability P and
that another function (another formula to generate g matrix) with
probability P-1

That´s it, if P is .7, i would like that in 70% of the times (for random i
and j) the matrix g was generated according to the formula above and in 30%
of the times with a different formula which i did not write

could anyone help me?
Thank you very much
Márcio

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