谢谢proc.com,谢谢。
>
> data( ppp, package="RcompHam94" )
> selection <- window( ppp, start=c(1973,2), end=c(1989,10) )
错误于window.default(ppp, start = c(1973, 2), end = c(1989, 10)) :
'start'不能大于'end'
此外: 警告信息:
In window.default(ppp, start = c(1973, 2), end = c(1989, 10)) :
'end'值没有变化
> ppp
PC6IT PZUNEW EXRITL
1948(1) 8.4 23.7 576.04
1948(2) 8.3 23.5 573.07
1948(3) 8.6 23.4 573.07
1948(4) 8.6 23.8 574.05
1948(5) 8.5 23.9 575.04
1948(6) 8.4 24.1 575.04
1948(7) 8.0 24.4 575.04
1948(8) 8.3 24.5 575.04
1948(9) 8.5 24.5 575.04
1948(10) 8.4 24.4 575.04
1948(11) 8.5 24.2 575.04
1948(12) 8.5 24.1 575.04
1949(1) 8.6 24.0 575.04
1949(2) 8.6 23.8 575.04
1949(3) 8.6 23.8 575.04
1949(4) 8.8 23.9 575.04
1949(5) 8.8 23.8 575.04
1949(6) 8.7 23.9 575.04
1949(7) 8.4 23.7 575.04
1949(8) 8.5 23.8 575.04
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