Dear All, I have a data frame which is structured as follows:
COMPANY_NUMBER COMPANY_NAME CITY YEAR_END_DATE CLOSE_SHARE_PRICE
22705 CARDIFF PROPERTY PUBLIC LIMITED COMPANY (THE)Egham
30/09/2005 NA
22705 CARDIFF PROPERTY PUBLIC LIMITED COMPANY (THE)Egham
30/09/2006 NA
22705 CARDIFF PROPERTY PUBLIC LIMITED COMPANY (THE)Egham
30/09/2007 9.65
22705 CARDIFF PROPERTY PUBLIC LIMITED COMPANY (THE)Egham
30/09/2008 6.55
22705 CARDIFF PROPERTY PUBLIC LIMITED COMPANY (THE)Egham
30/09/2009 6.55
22705 CARDIFF PROPERTY PUBLIC LIMITED COMPANY (THE)Egham
30/09/2010 7.5
10395804 TOC PROPERTY BACKED LENDING TRUST PLC Newcastle Upon Tyne
30/11/2016 NA
10395804 TOC PROPERTY BACKED LENDING TRUST PLC Newcastle Upon Tyne
30/11/2017 1.04
10395804 TOC PROPERTY BACKED LENDING TRUST PLC Newcastle Upon Tyne
30/11/2018 1.04
SC192761 MARTIN CURRIE GLOBAL PORTFOLIO TRUST PLC Edinburgh
31/01/2000 NA
SC192761 MARTIN CURRIE GLOBAL PORTFOLIO TRUST PLC Edinburgh
31/01/2001 NA
SC192761 MARTIN CURRIE GLOBAL PORTFOLIO TRUST PLC Edinburgh
31/01/2003 NA
SC192761 MARTIN CURRIE GLOBAL PORTFOLIO TRUST PLC Edinburgh
31/01/2004 NA
SC192761 MARTIN CURRIE GLOBAL PORTFOLIO TRUST PLC Edinburgh
31/01/2005 NA
SC192761 MARTIN CURRIE GLOBAL PORTFOLIO TRUST PLC Edinburgh
31/01/2006 1.09
SC192761 MARTIN CURRIE GLOBAL PORTFOLIO TRUST PLC Edinburgh
31/01/2007 1.17
SC192761 MARTIN CURRIE GLOBAL PORTFOLIO TRUST PLC Edinburgh
31/01/2008 1.24
SC192761 MARTIN CURRIE GLOBAL PORTFOLIO TRUST PLC Edinburgh
31/01/2009 0.9
SC192761 MARTIN CURRIE GLOBAL PORTFOLIO TRUST PLC Edinburgh
31/01/2010 1.14
I am trying to calculate the total change in share price like for CARDIFF
PROPERTY PUBLIC LIMITED COMPANY the total change
between 2005 and 2006 is NA and for 2006 and 2007 it is NA for 2007 and 2008 it
is -3.1 and 2008 and 2009 it is 0 and 2009 and 2010 it is +.95.
I am trying to achieve this via he following code:
for (i in 1:(nrow(PLC)-1))
if (isTRUE (PLC[i, 1] == PLC[i + 1, 1]))
{
PLC$CH_SH_PRICE(i+1) = (PLC$CLOSE_SHARE_PRICE[i+1] -
PLC$CLOSE_SHARE_PRICE[i])
}
I get the following error
Error in 1:(nrow(PLC) - 1) : argument of length 0
Can you kindly suggest any solution to this issue?
Thanks in advance.
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