我在做问题相把sunnew这个数值型的向量转化成日期型时结果出现了错误> sunnew
[1] 20150531 20150607 20150614 20150621 20150628 20150705 20150712 20150719 20150726
[10] 20150802 20150809 20150816 20150823 20150830 20150906 20150913 20150920 20150927
[19] 20151004 20151011 20151018 20151025 20151101 20151108 20151115 20151122 20151129
[28] 20151206 20151213 20151220 20151227 20160103 20160110 20160117
> class(sunnew)
[1] "numeric"
错误是这样的
sunnew<-as.Date(sunnew)
Error in as.Date.numeric(sunnew) : 'origin'一定得给值
请问这样的错误怎样改程序


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