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POGetting dataframe directly from JSON-file?
 

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    <p>First, let me thank everybody who contributes to Stackoverflow and R! I'm one of those R-users who is not so good at programming, but bravely try to use it for work, so the issue below is probably trivial... </p> <p>Here's the problem. I need to import files in JSON-format to R: </p> <pre><code># library(plyr) # library(RJSONIO) # lstJson &lt;- fromJSON("JSON_test.json") #This is the file I read # dput(lstJson) #What I did to get the txtJson below, for the benefit of testing. txtJson &lt;- structure(list(version = "1.1", result = structure(list(warnings = structure(list(), class = "AsIs"), fields = list(structure(list(info = "", rpl = 15, name = "time", type = "timeperiod"), .Names = c("info", "rpl", "name", "type")), structure(list(info = "", name = "object", type = "string"), .Names = c("info", "name", "type")), structure(list(info = "Counter1", name = "Counter1", type = "int"), .Names = c("info", "name", "type")), structure(list( info = "Counter2", name = "Counter2", type = "int"), .Names = c("info", "name", "type"))), timeout = 180, name = NULL, data = list( list(list("2011-05-01 17:00", NULL), list("Total", NULL), list(8051, NULL), list(44, NULL)), list(list("2011-05-01 17:15", NULL), list("Total", NULL), list(8362, NULL), list( 66, NULL))), type = "AbcDataSet"), .Names = c("warnings", "fields", "timeout", "name", "data", "type"))), .Names = c("version", "result")) dfJson &lt;- ldply(txtJson, data.frame) </code></pre> <p>What I need is a data frame similar to this: </p> <pre><code>time object Counter1 Counter2 2011-05-01 17:00 Total 8051 44 2011-05-01 17:15 Total 8362 66 </code></pre> <p>But instead I get </p> <pre><code>"Error in data.frame("2011-05-01 17:00", NULL, check.names = FALSE, stringsAsFactors = TRUE) : arguments imply differing number of rows: 1, 0" </code></pre> <p>I get the same error if I use the lstJson.</p> <p>I'm not sure if <code>RJSONIO</code> is supposed to be "smart enough" to parse files like this, or if I have to manually read the first line of the file, set column-types etc. The reason I'm not using CSV is that I want to "automatically" get dates in date-format, etc.</p> <p>Thanks, /Chris</p>
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