Thank you VERY much Gabor. I learned a LOT from this little post: 1) I can read/modify/write data in the array using the sub function 2) I can address columns using $COLUMN_HEADER 3) I can do an XY plot using X ~ Y
Brilliant! Thanks!
Small result PDF attached.
Cheers,
Mark
On Sun, Jun 28, 2009 at 7:04 PM, Gabor
Grothendieck<ggrothendi...@gmail.com> wrote:
> Try removing double quotes and commas from T1$EQUITY
> and then convert it to numeric:
>
> T1$EQUITY <- as.numeric(sub('[",]', '', T1$EQUITY))
> plot(EQUITY ~ TRADE, T1)
>
>
> On Sun, Jun 28, 2009 at 9:14 PM, Mark Knecht<markkne...@gmail.com> wrote:
>> On Sun, Jun 28, 2009 at 4:02 PM, Mark Knecht<markkne...@gmail.com> wrote:
>>> Hi all,
>>> Newbie alert.
>> <SNIP>
>>>
>>> The second question is about plotting one column from data set.
>>> I've used read.csv to read in somethign called PFA_VWAP. row.names,
>>> names and dim all return sensible values. The command
>>> PFA_VWAP_Equity<-PFA_VWAP[,10] seems to load the new variable with the
>>> right data for the equity curve, but how do I plot it?
>>> plot(PFA_VWAP_Equity) gives me a chart that doesn't make sense to me.
>>> Note however that the original values that make up column 10 were
>>> surrounded by quotes so I'm not sure how to tell what sort of data R
>>> thinks is in column 10. Is it numeric or text? I think it's integer
>>> from the last command.
>> <SNIP>
>>
>> So I've tried to boil this down to the something simple others can try
>> and duplicate my confusion, or just see what's going on from this
>> post.
>>
>> Basically I'm trying to get a handle on the difference between a list
>> and an array, and how to take my data read with read.csv and plot it
>> on a scatter chart.
>>
>> 1) Here's a small portion of one of my data files. I put this at C:\Test1.csv
>>
>> PORTFOLIO EQUITY TABLE
>> TRADE,MARK-SYS,DATE/TIME,PL/SIZE,PS METHOD,POS SIZE,POS
>> PL,DRAWDOWN,DRAWDOWN(%),EQUITY
>> 1,1,1/9/2004 1:11:00 PM,-146.00,As Given,1,-146.00,146.00,1.460,"9,854.00"
>> 2,1,1/12/2004 1:11:00 PM,874.00,As Given,1,874.00,0.00,0,"10,728.00"
>> 3,1,1/13/2004 1:11:00 PM,224.00,As Given,1,224.00,0.00,0,"10,952.00"
>> 4,1,1/28/2004 12:28:00 PM,-626.00,As Given,1,-626.00,626.00,5.716,"10,326.00"
>> 5,1,2/9/2004 1:11:00 PM,64.00,As Given,1,64.00,562.00,5.131,"10,390.00"
>> 6,1,2/13/2004 1:11:00 PM,-116.00,As Given,1,-116.00,678.00,6.191,"10,274.00"
>> 7,1,2/20/2004 1:11:00 PM,364.00,As Given,1,364.00,314.00,2.867,"10,638.00"
>> 8,1,2/23/2004 11:23:00 AM,-626.00,As Given,1,-626.00,940.00,8.583,"10,012.00"
>> 9,1,2/24/2004 1:11:00 PM,114.00,As Given,1,114.00,826.00,7.542,"10,126.00"
>> 10,1,2/25/2004 1:11:00 PM,444.00,As Given,1,444.00,382.00,3.488,"10,570.00"
>>
>> (In case of line breakage everything from TRADE to EQUITY is on line 2
>> and there are 10 lines that follow making 12 lines total.)
>>
>> 2) I read this into R creating T1 using the command
>>
>> T1<-read.csv("C:\\Test1.csv",skip=1,header=TRUE)
>>
>> 3) If I type T1 and hit return then I see the data.
>>
>> 4) dim(T1) says 10 10 which is correct.
>>
>> 5) I can read the two columns I want to use to create the scatter plot using:
>>
>>> T1[,1]
>> [1] 1 2 3 4 5 6 7 8 9 10
>>> T1[,10]
>> [1] 9,854.00 10,728.00 10,952.00 10,326.00 10,390.00 10,274.00
>> 10,638.00 10,012.00 10,126.00 10,570.00
>> Levels: 10,012.00 10,126.00 10,274.00 10,326.00 10,390.00 10,570.00
>> 10,638.00 10,728.00 10,952.00 9,854.00
>>>
>>
>> Now, here's the confusion. plot(T1[,1],T1[,10]) creates a plot, but
>> the range on both X & Y is 1-10. I want 1-10 on the X axis but need
>> the values in the first line of the T1[,10] return as the Y axis.
>>
>> How can I create that scatter plot?
>>
>> Thanks,
>> Mark
>>
>> ______________________________________________
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
MDDFEquityCurve.pdf
Description: Adobe PDF document
______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
