Created
November 12, 2010 16:28
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R function for turning a data frame into JSON suitable for use in Protovis
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| entity.write <- function(x){ | |
| out = as.character(x) | |
| out = paste("\"", x, "\"", sep="") | |
| out | |
| } | |
| toJSONdf <- function(x){ | |
| str = "[" | |
| for(row in 1:(dim(x)[1])){ | |
| first_entry = TRUE | |
| i = 0 | |
| for (n in names(x)){ | |
| i = i + 1 | |
| if (first_entry) { | |
| str = paste(str, "{", sep="") | |
| first_entry = FALSE | |
| } | |
| str = paste(str,deparse(n),":", entity.write(x[row, n]),sep="") | |
| if(i < dim(x)[2]){ | |
| str = paste(str, ",", sep="") | |
| } | |
| } | |
| str = paste(str, "}", sep="") | |
| if (row < dim(x)[1]){ | |
| str = paste(str, ",", sep="") | |
| } | |
| } | |
| str = paste(str, "]", sep="") | |
| str | |
| } |
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The rjson package is great, but it turns data frames into [x:{1,2,3}, y:{1,2,3}] where for Protovis, you want [{x:1, y:1}, {x:2,y:2}, {x:3,y:3}]. Hoping there is a smarter way to do this (and that someone else wants to add all the error checking and message).