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r语言 reshape库(R language library reshape)
r语言 reshape库(R language library reshape) R language, Reshape Library 1., for Reshape packages, the idea is to convert a data table into a series of items, and then trim them into the desired format. The process of converting a data table into a list of events becomes melt, and the process of converting the list of events into data tables becomes cast. narrow Symbol Date Close open 1 GE 2009-03-02 10.11 8.92 2 GE 2009-02-02 8.51 12.03 3 GE 2009-01-02 12.13 16.51 4 GOOD 2009-03-02 348.06 333.33 5 GOOD 2009-02-02 337.99 334.29 6 GOOD 2009-01-02 338.53 308.60 7 AAPL 2009-03-02 105.12 88.12 8 AAPL 2009-02-02 89.31 89.10 9 AAPL 2009-01-02 90.13 85.88 10 AXP 2009-03-02 13.63 11.68 11 AXP 2009-02-02 12.06 16.35 12 AXP 2009-01-02 16.73 18.57 13 GS 2009-03-02 106.02 87.86 14 GS 2009-02-02 91.08 78.78 15 GS 2009-01-02 80.73 84.02 melt.narrow-melt (narrow) Using, symbol, Date, as, ID, variables melt.narrow Symbol Date variable value 1 GE 2009-03-02 Close 10.11 2 GE 2009-02-02 Close 8.51 3 GE 2009-01-02 Close 12.13 4 GOOD 2009-03-02 Close 348.06 5 GOOD 2009-02-02 Close 337.99 6 GOOD 2009-01-02 Close 338.53 7 AAPL 2009-03-02 Close 105.12 8 AAPL 2009-02-02 Close 89.31 9 AAPL 2009-01-02 Close 90.13 10 AXP 2009-03-02 Close 13.63 11 AXP 2009-02-02 Close 12.06 12 AXP 2009-01-02 Close 16.73 13 GS 2009-03-02 Close 106.02 14 GS 2009-02-02 Close 91.08 15 GS 2009-01-02 Close 80.73 16 GE 2009-03-02 open 8.92 17 GE 2009-02-02 open 12.03 18 GE 2009-01-02 open 16.51 19 GOOD 2009-03-02 open 333.33 20 GOOD 2009-02-02 open 334.29 21 GOOD 2009-01-02 open 308.60 22 AAPL 2009-03-02 open 88.12 23 AAPL 2009-02-02 open 89.10 24 AAPL 2009-01-02 open 85.88 25 AXP 2009-03-02 open 11.68 26 AXP 2009-02-02 open 16.35 27 AXP 2009-01-02 open 18.57 28 GS 2009-03-02 open 87.86 29 GS 2009-02-02 open 78.78 30 GS 2009-01-02 open 84.02 According to the variable GE price list # cast (data=melt.narrow, Date~variable, subset= (symbol==, GE)) Date Close open 1 2009-01-02 12.13 16.51 2 2009-02-02 8.51 12.03 3 2009-03
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