[R] Line Graph - Greater than 2 variables on plot

[Francisco J. Zagmutt]

You can also use the facilities in the lattice package.  Using Jim´s 
data names:

require(lattice)
xyplot(A+B+C~D, data=wag, type="l", auto.key=list(points = FALSE, lines 
= TRUE, space = "bottom"), ylab="value", main="Three variable plot")

Regards,

Francisco


Jim Lemon wrote:
> Wayne Aldo Gavioli wrote:
>> Hello all,
>>
>> I was wondering if anyone knew how to construct a multiple line graph on R,
>> where there are 2 (or more) sets of data points plotted against some x axis of
>> data, and you can draw a line on the graph connecting each set of data points.
>>
>> For example:
>>
>> A               B              C          D
>> 0.6566        2.1185        1.2320        5
>> 0.647         2.0865        1.2325        10
>> 0.6532        2.1060        1.2287        15
>> 0.6487        2.1290        1.2313        20
>> 0.6594        2.1285        1.2341        25
>> 0.6577        2.1070        1.2343        30
>> 0.6579        2.1345        1.2340        35
>> 0.6734        2.1705        1.2362        40
>> 0.675         2.1845        1.2372        45
>> 0.6592        2.1550        1.2340        50
>> 0.6647        2.1710        1.2305        55
>>
>>
>>
>> Would there be a way:
>> a) To graph all the points of data in sets A, B and C as Y coordinates on one
>> graph, using the points in set D as the X-axis/coordinates for all 3 sets (A, B
>> and C)?
>> b) To be able to draw 3 lines on the graph that connect each set of data (1 line
>> connects all the A points, one line connects all the B points, one line connects
>> all the C points)
>>
>>
>> I couldn't find anything in the examples or the help section about multiple
>> lines on the same graph, only one line.
>>
> Hi Wayne,
> 
> Assume your data is in a data frame named "wag":
> 
> plot(wag$D,wag$A,main="Three variable plot",xlab="D",ylab="Value",
>   ylim=range(wag[c("A","B","C")]),type="l",col=2)
> lines(wag$D,wag$B,type="l",pch=2,col=3)
> lines(wag$D,wag$C,type="l",pch=3,col=4)
> legend(25,1.9,c("A","B","C"),lty=1,col=2:4)
> 
> Jim
> 
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