[R] Plotting Ranges as Vertical Lines

[Uwe Ligges]

Some example code using segments():

  x <- 1:10
  low <- rnorm(10)
  high <- rnorm(10)
  plot(x, low, ylim = range(c(low, high)), type="n")
  segments(x, low, x, high)

Uwe Ligges


Bret Collier wrote:

> R Users,
> I have not been able to find anything close to what I want searching
> R-help and I am hoping someone could point me in the right direction.
> 
> The data consists of differences in length of individual salamanders
> collected at time of initial capture and last recapture (excerpt below).
>  What I am trying to do is plot a vertical line for each individual (ID)
> representing the change in size between initial capture (CAPTURESVL) and
> last recapture (RECAPSVL) (the range of sizes would be on the y-axis),
> hence vertical line length would be equal to GROWTH (which can be + or
> -).  I would like to make this plot over the time between recaptures
> (MONTHELAPSED) which would be on the x-axis.
> 
>        ID CAPMONTH CAPTURESVL CAPTUREMASSGR RECAPMONTH RECAPSVL
> RECAPMASSGR GROWTH MASSGR MONTHELAPSED
> 1    SJC8        3         21           0.1         11       22        
> 0.2      1    0.1            8
> 2    SJC9        3         33           0.7         13       35        
> 0.9      2    0.2           10
> 3   SJC10        3         19           0.5          9       20        
> 0.2      1   -0.3            6
> 4   SJC11        4         36           1.1         13       41        
> 1.5      5    0.4            9
> 5   SJC12        4         19           0.1         15       28        
> 0.4      9    0.3           11
> 6   SJC17        6         24           0.3         11       26        
> 0.4      2    0.1            5
> 7   SJC18        6         43           1.1         24       43        
> 1.8      0    0.7           18
> 8   SJC23        7         16           0.1         15       20        
> 0.1      4    0.0            8
> 9   SJC24        7         22           0.5         22       40        
> 1.9     18    1.4           15
> 10  SJC25        8         23           0.4         15       27        
> 0.6      4    0.2            7
> 11  SJC32        9         37           1.1         16       38        
> 1.5      1    0.4            7
> 12  SJC34        9         31           0.8         12       33        
> 1.1      2    0.3            3
> 13  SJC35        9         19           0.2         14       23        
> 0.3      4    0.1            5
> 14  SJC53       11         41           1.2         12       40        
> 1.4     -1    0.2            1
> 15  SJC55       11         41           1.3         12       40        
> 1.7     -1    0.4            1
> 16  SJC60       11         39           1.5         22       41        
> 1.8      2    0.3           11
> 17  SJC65       12         41           1.5         23       44        
> 1.8      3    0.3           11
> 
> I am stuck on how to 1) create the vertical segments and 2) link them
> to x-axis values for MONTHELAPSED?  I would have provided some example
> code, except I have not been able to figure out how to approach this
> yet.  Since I am probably not looking in the right place, could someone
> point me in the right direction or towards some example figure code/help
> files that I must have missed in my searching?
> 
> Thanks,
> Bret
> TX A&M
> 
> platform i386-pc-mingw32
> arch     i386           
> os       mingw32        
> system   i386, mingw32  
> status                  
> major    2              
> minor    0.1            
> year     2004           
> month    11             
> day      15             
> language R
> 
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