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@@ -2718,9 +2718,11 @@ Operations, , Logical Operations, calc, GNU Emacs Calc Manual}). For example
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@item if($1 < 20, teen, string(""))
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"teen" if age $1 is less than 20, else the Org table result field is set to
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empty with the empty string.
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-@item if("$1" == "nan" || "$2" == "nan", string(""), $1 + $2); E
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+@item if("$1" == "nan" || "$2" == "nan", string(""), $1 + $2); E f-1
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Sum of the first two columns. When at least one of the input fields is empty
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-the Org table result field is set to empty.
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+the Org table result field is set to empty. @samp{E} is required to not
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+convert empty fields to 0. @samp{f-1} is an optional Calc format string
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+similar to @samp{%.1f} but leaves empty results empty.
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@item if(typeof(vmean($1..$7)) == 12, string(""), vmean($1..$7); E
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Mean value of a range unless there is any empty field. Every field in the
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range that is empty is replaced by @samp{nan} which lets @samp{vmean} result
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Michael Brand