[R] Is there an R program that produces optimal solution/mix of multiple samples' varying volumes and values

[luke]

Sorry about the lengthy subject line.
Anyone know of an R' program that can look at several sources' varying
available volumes/amounts and their individual set of values, compared
to a "target" range/curve for these values, to find the optimal
mixture(s) of these possible sources for the desired curve, and for a
specified amount? I hope that makes sense as a reader.

Thanks for your time.
Luke