[R] Replacing data.frame values

[Dennis L. Malandro]

Hello,

I have two data frames, NameAndConc.df and
WhichOnes.df.  NameAndConc.df has two columns, the
first column is the names of some material, and the
second column is the concentration of active
ingredient.

> NameAndConc.df
       name conc
1 material1  0.8
2 material2  0.5
3 material3  0.4

WhichOnes.df has two columns, each of which specifies
which material.

> WhichOnes.df
  component1 component2
1  material2  material3
2         NA  material1
3  material3  material2
4  material2         NA

>From these two data.frames, I'd like to generate a
third data frame that is WhichOnes.df with the names
replaced by the corresponding concentrations from
NameAndConc.df.  So it would be

> New.df
  component1 component2
1        0.5        0.4
2         NA        0.8
3        0.4        0.5
4        0.5         NA


Would someone please lend me a help'n hand with this?

Cheers,
Dennis

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