r - Convert numeric values to dates -

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मेरे पास एक संख्यात्मक वेक्टर है जो निम्नानुसार है 

  aa & lt; - c (1022011, 2022011 , 13022011, 23022011) (यह सदिश सिर्फ एक नमूना है, यह बहुत लंबा है)

मान ऐसे तरीके से लिखे गए हैं कि पहला मान दिन और महीने और फिर वर्ष है।

मैं अभी क्या कर रहा हूं 

  as.Date (as.character (aa),% d% m% y ")

लेकिन,

यह एक अंक के नंबरों के मामले में समस्याएं (एनए वापस कर रहा है) (यानी 1022011, 2022011)।

ऐसा मूल रूप से 

 < कोड> जैसा.डेट ("1022011", "% d% m% Y") काम नहीं करता है

लेकिन 

  as.Date ("01022011 "", "% D% m% Y") (संख्या के आगे '0' चिपकाने) काम करता है।

मैं ऐसे मामलों में '0' चिपकाने से बचना चाहता हूं। क्या कोई अन्य (प्रत्यक्ष) एक ही बार में संख्यात्मक मानों की तारीखों में बदलने के लिए विकल्प?

अपने प्लेटफ़ॉर्म पर निर्भर करते हुए, आप उपयोग कर सकते हैं स्प्रिंटफ़ क्रम में टी ओ शुरुआत में शून्य जोड़ें ऐसा लगता है कि मैक इस के साथ ठीक है, लेकिन विंडोज़ 7 ने ओपी के साथ चर्चा नहीं की। दिनांक (स्प्रिंटफ़ ("% 08 एस", एएए), प्रारूप = "% d% m% Y" के रूप में) 

  aa & lt; -c (1022011, 2022011, 13022011, 23022011) [ 1] "2011-02-01" "2011-02-02" "2011-02-13" "2011-02-23"

UPDATE < / P>

@ कैथि ने कृपया उल्लेख किया है कि sprintf ("% 08i", एए) विंडोज 7 पर काम करता है।


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