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Hello! I am using the TeXmacs interface to R. (Though I encountered a similar problem when using Sweave) In doing calculations I often ecounter this scenario: I'll have some calculations in my file: -- A=read.lots.of.data() B=huge.calculation.on(A) C=another.calculation.on(B) -- Now, if A has already been read, I don't need to re-read it. If B has already been calculated, I don't