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Only attempt to print if x is a suitable data.table #841

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Only attempt to print if x is a suitable data.table #841

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2 changes: 2 additions & 0 deletions R/data.table.R
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Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,8 @@ print.data.table = function(x,
nrows=getOption("datatable.print.nrows"), # (100) under this the whole (small) table is printed, unless topn is provided
row.names = TRUE, ...)
{
if (class(unclass(x)) != 'list')
stop('Not a suitable data.table')
if (!.global$print) {
# := in [.data.table sets print=FALSE, when appropriate, to suppress := autoprinting at the console
.global$print = TRUE
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