Multiple plots from data frames in a list after a conditional test?

A few suggestions: Change your acTest function so that it actually accepts a data. Frame as a parameter. Otherwise you'll have lots of problems with the function looking for (and modifying) objects named DateA and Usage in the global environment acTest Union(a1,id,a2) mgFun = acTest).

A few suggestions: Change your acTest function so that it actually accepts a data. Frame as a parameter. Otherwise you'll have lots of problems with the function looking for (and modifying) objects named DateA and Usage in the global environment.

AcTest Lapply(drugList,FUN=acTest) Finally, you can do tasks like this without storing each data frame as a separate list element by using tools like ddply (among others) that split a data frame using one variable, apply a function to each piece and then reassemble them into a single data frame again. In your case, that would look something like: ddply(AB,.(Drug),. Fun = acTest).

Thanks joran. Works perfectly. – John Jul 6 at 3:07.

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