[R] [EXT] Calculating the total change in shareprice over a time periond
David K Stevens
d@v|d@@teven@ @end|ng |rom u@u@edu
Wed Mar 31 20:17:54 CEST 2021
Mr. Blueyonder,
There are a number of problems with this.
1) is the data below really in a data frame? I coerced your table into a
data frame, guessing at the structure and when I print out the 1st three
rows I get an alignment into proper columns
COMPANY_NUMBER COMPANY_NAME CITY YEAR_END_DATE
CLOSE_SHARE_PRICE
1 22705 CARDIFF PROPERTY PUBLIC LIMITED COMPANY
(THE)Egham 30/09/2005 NA
2 22705 CARDIFF PROPERTY PUBLIC LIMITED COMPANY
(THE)Egham 30/09/2006 NA
3 22705 CARDIFF PROPERTY PUBLIC LIMITED COMPANY
(THE)Egham 30/09/2007 9.65
I'd guess that your PLC is actually a 1 column data frame based on how
you present it. Because what you gave is so small, I just added commas
where they seemed suitable and used
PLC <- read.csv(file='clipboard',header=T,stringsAsFactors = T)
to create the data frame above. It's likely that your actual problem is
much larger so I'd export the data as a CSV file, and read it into R in
a similar way using
PLC <- read.csv(file='myfile.csv',header=T,stringsAsFactors = T)
2) Your code is incorrect as is for two reasons. a) for your approach to
work, you'll need to create an empty column CH_SH_PRICE before running
the loop, because your loop is trying to place data into a non-existent
column b) the code PLC$CH_SH_PRICE(i+1) has to use square brackets,
otherwise R thinks PCL$CH_SH_PRICE is a function rather than a reference
to column element i+1 as in PLC$CH_SH_PRICE[i+1]
Also, the functionisTRUE is actually the following
function (x)
is.logical(x) && length(x) == 1L && !is.na(x) && x
Is this really what you want to do, rather than just checking the
company number, as inPLC[i,1] == PLC[i+1,1]?
Assuming (tentatively) I guessed right, here's what I got
COMPANY_NUMBER COMPANY_NAME CITY
YEAR_END_DATE CLOSE_SHARE_PRICE CH_SH_PRICE
1 22705 CARDIFF PROPERTY PUBLIC LIMITED COMPANY (THE)Egham
30/09/2005 NA NA
2 22705 CARDIFF PROPERTY PUBLIC LIMITED COMPANY (THE)Egham
30/09/2006 NA NA
3 22705 CARDIFF PROPERTY PUBLIC LIMITED COMPANY (THE)Egham
30/09/2007 9.65 NA
4 22705 CARDIFF PROPERTY PUBLIC LIMITED COMPANY (THE)Egham
30/09/2008 6.55 -3.10
Good luck.
David Stevens
On 3/31/2021 11:04 AM, e-mail ma015k3113 via R-help wrote:
> 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.
> [[alternative HTML version deleted]]
>
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--
David K Stevens, P.E., Ph.D.
Professor, Environmental Engineering
Civil and Environmental Engineering
Utah Water Research Laboratory
8200 Old Main Hill
Logan, UT 84322-8200
435 797 3229 - voice
435 797 1363 - fax
david.stevens using usu.edu
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