R-遍历变量名

Question

I'm trying to iterate ( for ) through variables. This is the code:

json_YR_FKA <- getURL('https://www.kimonolabs.com/api/b7i1ej7i?apikey=-')
json_9A_BTE <- getURL('https://www.kimonolabs.com/api/a83t52cg?apikey=-')

I will have two variables: json_YR_FKA / json_9A_BTE

matriculas <- ls()
matriculas <- str(matriculas)
matriculas

matriculas [1] "json_9A_BTE" "json_YR_FKA"

And now, I need to do some things with both variables, so I have a for iteration:

for (i in 1:total){
   avion <- fromJSON(matriculas[i])  
   # boring code
}

My idea is to do this:

First iteration: fromJSON(json_9A_BTE) Second iteration: fromJSON(json_YR_FKA)

But at the beginning of the first iteration I get this:

fromJSON(matriculas[i]) Error in fromJSON(matriculas[1]) : unexpected character 'j'

And I don't know why.

Anyone?

Thanks in advance.

Luis

Answer 1

The approach that you're taking isn't very R-like, so I'm guessing you're coming from Python or some other language?

First off, I'm not sure what packages you're using. Where does getURL() come from? Which JSON package are you using? I suggest jsonlite since it can just pull data in from the url.

library(jsonlite)

myUrls <- c(json_YR_FKA='https://www.kimonolabs.com/api/b7i1ej7i?apikey=-',
            json_9A_BTE='https://www.kimonolabs.com/api/a83t52cg?apikey=-')

matriculas <- lapply(myUrls, fromJSON) #Provides a list of your data.

f_doSomething <- function(dat) {
    #boring code that puts data into 'out' variable
    return(out)
    }

avion <- lapply(matriculas, f_doSomething)