各位大神,请问我如何让X2的取值全部替换X1, X2有部分缺失值, 谢谢你们了!!!!!!!!!
X1 X2
.0327982 .
.0327982 .
.0327982 .
.0327982 .
.0327982 .
.0327982 .
.0327982 .
.0327982 .
.0327982 .
.0327982 .
.0327982 .
.0327982 .
.0055529 .0055529
.0055529 .0055529
.0055529 .0055529
.0055529 .0055529
.0055529 .0055529
.0055529 .0055529
.0055529 .0055529


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