Re: [R] Produce multiple line graphs

[David Winsemius]

> On Sep 25, 2016, at 6:43 PM, John Sorkin  wrote:
> 
> I have a data frame that contains data for multiple (seven) subjects. Each 
> subject is represented by a new value of PID.
> I would like to plot the data for all seven subjects. For each subject I want 
> to plot a line showing CT as a function of Nit, with the dots for each 
> subject joined. I have tried to accomplish this using the by function. I get 
> an error message, 
> Error in match.fun(panel) : 
>  'xx[, "CT"]' is not a function, character or symbol
> I have no idea what is causing the error, nor how to correct the error, nor 
> how to get the dots for each point be connected by a line.
> 
> 
> Any help would be appreciated!
> 
> 
> PID <- c( 1 ,  1   ,  1   , 1   , 2, 2, 2, 2, 3   ,   3  ,  3   ,  3   ,  4   
> ,  4,  4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7   ,  7   ,7  , 7)
> Nit <- c(NA , -9.23,-11.61,-7.88,NA,NA,NA,NA,-5.59,  0.73,-10.55, -9.13,  
> 3.67, NA, NA,-13.26,NA,NA,NA,NA,NA,NA,NA,NA,-9.36,  5.08,  -5.73, 2.02)
> CT  <- c(544,459   ,432   ,NA   ,NA,NA,NA,NA,1398 ,1287  ,1049  , NA   ,543   
> ,474,507,NA,NA,NA,NA,NA,NA,NA,NA,NA,992  ,992   ,1078   ,NA)
> xx  <- data.frame(PID=PID,Nit=Nit,CT=CT)
> xx
> by(xx,as.factor(xx[,"PID"]),plot,xx[,"Nit"],xx[,"CT"])

Wouldn't this just be:

library(lattice)
xyplot( CT ~ Nit, group= PID, data=xx, type="b")


-- 
David (MD, MPH)


> John David Sorkin M.D., Ph.D.

David Winsemius
Alameda, CA, USA

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Re: [R] Produce multiple line graphs

[Jim Lemon]

Hi John,
I know this is kind of dumb, but:

plot(0,xlim=range(xx$Nit,na.rm=TRUE),
 ylim=range(xx$CT,na.rm=TRUE),type="n",
 xlab="Nit",ylab="CT")
for(i in unique(xx$PID))
 points(xx$Nit[xx$PID==i],xx$CT[xx$PID==i],
 pch=i,col=i,type="b")

Jim


On Mon, Sep 26, 2016 at 11:43 AM, John Sorkin
 wrote:
> I have a data frame that contains data for multiple (seven) subjects. Each 
> subject is represented by a new value of PID.
> I would like to plot the data for all seven subjects. For each subject I want 
> to plot a line showing CT as a function of Nit, with the dots for each 
> subject joined. I have tried to accomplish this using the by function. I get 
> an error message,
> Error in match.fun(panel) :
>   'xx[, "CT"]' is not a function, character or symbol
> I have no idea what is causing the error, nor how to correct the error, nor 
> how to get the dots for each point be connected by a line.
>
>
> Any help would be appreciated!
>
>
> PID <- c( 1 ,  1   ,  1   , 1   , 2, 2, 2, 2, 3   ,   3  ,  3   ,  3   ,  4   
> ,  4,  4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7   ,  7   ,7  , 7)
> Nit <- c(NA , -9.23,-11.61,-7.88,NA,NA,NA,NA,-5.59,  0.73,-10.55, -9.13,  
> 3.67, NA, NA,-13.26,NA,NA,NA,NA,NA,NA,NA,NA,-9.36,  5.08,  -5.73, 2.02)
> CT  <- c(544,459   ,432   ,NA   ,NA,NA,NA,NA,1398 ,1287  ,1049  , NA   ,543   
> ,474,507,NA,NA,NA,NA,NA,NA,NA,NA,NA,992  ,992   ,1078   ,NA)
> xx  <- data.frame(PID=PID,Nit=Nit,CT=CT)
> xx
> by(xx,as.factor(xx[,"PID"]),plot,xx[,"Nit"],xx[,"CT"])
>
>
>
>
> John David Sorkin M.D., Ph.D.
> Professor of Medicine
> Chief, Biostatistics and Informatics
> University of Maryland School of Medicine Division of Gerontology and 
> Geriatric Medicine
> Baltimore VA Medical Center
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
> (Phone) 410-605-7119
> (Fax) 410-605-7913 (Please call phone number above prior to faxing)
>
>
> Confidentiality Statement:
> This email message, including any attachments, is for ...{{dropped:12}}

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[R] Produce multiple line graphs

[John Sorkin]

I have a data frame that contains data for multiple (seven) subjects. Each 
subject is represented by a new value of PID.
I would like to plot the data for all seven subjects. For each subject I want 
to plot a line showing CT as a function of Nit, with the dots for each subject 
joined. I have tried to accomplish this using the by function. I get an error 
message, 
Error in match.fun(panel) : 
  'xx[, "CT"]' is not a function, character or symbol
I have no idea what is causing the error, nor how to correct the error, nor how 
to get the dots for each point be connected by a line.


Any help would be appreciated!


PID <- c( 1 ,  1   ,  1   , 1   , 2, 2, 2, 2, 3   ,   3  ,  3   ,  3   ,  4   , 
 4,  4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7   ,  7   ,7  , 7)
Nit <- c(NA , -9.23,-11.61,-7.88,NA,NA,NA,NA,-5.59,  0.73,-10.55, -9.13,  3.67, 
NA, NA,-13.26,NA,NA,NA,NA,NA,NA,NA,NA,-9.36,  5.08,  -5.73, 2.02)
CT  <- c(544,459   ,432   ,NA   ,NA,NA,NA,NA,1398 ,1287  ,1049  , NA   ,543   
,474,507,NA,NA,NA,NA,NA,NA,NA,NA,NA,992  ,992   ,1078   ,NA)
xx  <- data.frame(PID=PID,Nit=Nit,CT=CT)
xx
by(xx,as.factor(xx[,"PID"]),plot,xx[,"Nit"],xx[,"CT"])




John David Sorkin M.D., Ph.D.
Professor of Medicine
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology and Geriatric 
Medicine
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing) 


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