How to replace a string in Sexpr by a variable

Question

I am using latex to automate reports.  In R, I create a data frame that contains all of the metrics and then using Sexpr I filter that data frame for a specific metric.  Currently, I have this:

Sexpr{df$var1[df$var2 == 'metric1']}

Is it possible to save "metric1" as a variable so that in each section I can just call it once?

For example:

foo1 = metric1
Sexpr{df$var1[df$var2 == foo1]}

John M · Answer

I think you simply need to quote what you're doing. You can do something like:

<<mycodechunk>>=
foo1 = "metric1"
@

Then somewhere in the Sweave document:

Sexpr{df$var1[df$var2 == foo1]}

or probably:

Sexpr{df$var1[df$var2 == foo1,]}

How to replace a string in Sexpr by a variable

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