[R] Problem having tick marks aligned when plotting three graphs on top of one another.

[Jim Holtman]

use 'plot' and 'lines'

plot(x,y1,ylim=range(c(y1,y2,y3)))
lines(x,y2)
lines(x,y3)

Sent from my iPad

On Apr 22, 2011, at 23:55, "John Sorkin" <jsorkin at grecc.umaryland.edu> wrote:

> R 2.10
> Windows 7
> 
> I am trying to plot three graphs on top of each other. I need to have the axises perfectly aligned. For some reason the ticks on the y axes are slightly off so they do not perfectly align. Can someone tell me how I can get the to overlay each other perfectly? I thought the yaxp parameter would solve my problem, but it does not. My data and code follows:
> 
>> summaryresults[1:20,]
>      Slope PctCont PctCat PctTTst
> [1,]  0.05     7.4    5.6     6.3
> [2,]  0.10    17.7   11.3    13.3
> [3,]  0.15    32.7   18.7    25.6
> [4,]  0.20    53.3   27.5    40.2
> [5,]  0.25    72.1   41.2    54.5
> [6,]  0.30    85.5   52.9    70.8
> [7,]  0.35    93.9   65.2    83.6
> [8,]  0.40    97.0   73.6    89.9
> [9,]  0.45    99.7   84.8    96.5
> [10,]  0.50    99.9   90.1    98.4
> [11,]  0.55   100.0   93.2    99.7
> [12,]  0.60   100.0   97.3    99.8
> [13,]  0.65   100.0   98.8   100.0
> [14,]  0.70   100.0   99.4   100.0
> [15,]  0.75   100.0   99.8   100.0
> [16,]  0.80   100.0   99.7   100.0
> [17,]  0.85   100.0  100.0   100.0
> [18,]  0.90   100.0  100.0   100.0
> [19,]  0.95   100.0  100.0   100.0
> [20,]  1.00   100.0  100.0   100.0
>> plot(summaryresults[,"Slope"],summaryresults[,"PctCont"],type="b",yaxp=c(0,100,10))
>> par(new=TRUE)
>> plot(summaryresults[,"Slope"],summaryresults[,"PctCat"],type="b",yaxp=c(0,100,10))
>> par(new=TRUE)
>> plot(summaryresults[,"Slope"],summaryresults[,"PctTTst"],type="b",yaxp=c(0,100,10))
> 
> 
> John David Sorkin M.D., Ph.D.
> Chief, Biostatistics and Informatics
> University of Maryland School of Medicine Division of Gerontology
> 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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