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我想知道R包'qdap'中是否有lookup()函数。我安装了它并尝试使用它,但抛出一个错误“找不到函数“查找”。
for(k in 1:nrow(mtmModFrame)){ mtmModFrame$mtm[k]<- lookup(uiqFrame$DATE[k], mtmFrame$DATE, mtmFrame$stcockMtm) } print(mtmModFrame)
提前致谢。阿米特。