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Loop over string vector for graphs in R

I would like to iterate over a named string vector country

that contains country codes such as AFG

, ETH

etc.

The Stata

code will look like this:

levelsof country, local(xtry)
foreach x in local xtry:
 graph command here if xtry=="`x'"
 graph save mygraph

}

Is there a comparable command for levelsof

as well as an if statement that restricts the data to a specific country code, which is the string from which each graph will be generated?

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2 answers


You would use something like this:

for (cn in levels(country))
    {
    if (cn=="x")
       {
       <do something>
       }
    else
       {
       <do something else>
       }
    }

If you want to check multiple countries, you can use



if (cn == "x" | cn == "y")

and

if (cn %in% c("x", "y", "z"))
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As an aside, the applied group of functions is really similar, if not identical to the design for loops, the fact is that the applied group of functions is a wrapper for such loops and is specific to different data structures and requirements - more Rish-image makes loops. I don't know how valid the speed increase requirements are - I am skeptical. Other than that, if I understand what you are asking (I don't know stata), it might be easier to multiply the data with R and then do multiple plots for each subset.



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