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I'd like to pass argument (stringsAsFactors=FALSE) to rbind in do.call. But the following doesn't work:
data <- do.call(rbind, strsplit(readLines("/home/jianfezhang/adoption.txt"), split="\t#\t"), args=list(stringsAsFactors=FALSE)) 
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call() function in R constructs and executes a function call from a name or a function as well as a list of arguments to be passed to it. In other words, the do. call() function allows us to call the R function using a list to hold the function's arguments instead of writing out the arguments.
The call by value method of passing arguments to a function copies the actual value of an argument into the formal parameter of the function. In this case, changes made to the parameter inside the function have no effect on the argument. By default, C programming uses call by value to pass arguments.
Yes. See the Examples section of ? optim and ? integrate for some R functions that accept other functions as arguments.
do.call(rbind.data.frame, c(list(iris), list(iris), stringsAsFactors=FALSE)) would have been my answer, if it wasn't for the fact that rbind does not know what to do with stringsAsFactors (but cbind.data.frame would).
The output of strsplit is presumably a list of vectors, in which case rbind creates a matrix. You can specify stringsAsFactors when converting this matrix to a data.frame,
data.frame(do.call(rbind, list(1:10, letters[1:10])), stringsAsFactors=FALSE) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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