Gnuplot is very rich in command options using the set operator.
gnuplot有许多命令选项,可以通过set操作符使用它们。
The other approach to matching "bat," "bat," "cat," or "cat" USES the (brackets) set operator.
匹配“bat”、“bat”、“cat”或“cat”的另一个方法是使用(方括号)集合操作符。
UNION ALL is the only set operator allowed between the last anchor member and first recursive member, and when combining multiple recursive members.
在最后一个定位点成员和第一个递归成员之间,以及组合多个递归成员时,只能使用UNION ALL集合运算符。
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