it is desired to abort an R script with a message, returning to the R
prompt,
pending 'if' results, as follows:
------------------------
first part of script
.
.
if (condition) {
action
} else
{
'error'
abort
}
.
.
remainder of script
---------------------------
note: 'stop' aborts the current script expression but keeps running the
script.[too little]
'quit' aborts the r session. [too much]
thx,
ted
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