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使用参考表,我正在搜索重新定位从几列到保留一些重要字段(其他列)的行的数据。R for循环到sloow
Name Amplitude A B
M2 3.264 29.0 28.98
S2 0.781 51.9 30.0
N2 0.63 12.3 28.43
K1 1.263 136.8 15.04
M4 0.043 286.0 57.96
我有一个最后的结果是这样的:
Name Amplitude Value Code
M2 3.264 29.0 A
S2 0.781 51.9 A
N2 0.63 12.3 A
K1 1.263 136.8 A
M4 0.043 286.0 B
M2 3.264 28.98 B
S2 0.781 30.0 B
N2 0.63 15.04 B
K1 1.263 57.96 B
这只是一个例子,我有从振幅在第一个表更多的列到一个。我使用下面的代码:
Final<-NULL
colname<-colnames(ReferenceAll)
for (i in (1:nrow(ReferenceAll))){
for (j in (1:ncol(ReferenceAll))){
if (j>2) { # the number is from the column I want to get in the results
temp<-as.data.frame(rbind(cbind(Name=ReferenceAll[i,1],
Amplitude=as.character.factor(ReferenceAll[i,2]),
Value=ReferenceAll[i,j],
Code=colname[j])))
Final<-rbind(Final,temp)}}}
当我有几行需要毫秒,但是当我有超过100行需要时间。谁能帮我?
'库(reshape2);熔体(DF1,id.vars = C( “姓名”, “振幅”),value.name = “值”,variable.name = “代码”)' – RHertel
基R:'reshape(df,vary = c(“A”,“B”),direction =“long”,v.names = c(“Value”),times = c(“A”,“B”)) ' – Zelazny7