[R] Can't add error bars to existing line graph

[Bruno.Salonen]

Hi all,

I'm trying to add error bars to an existing line graph in base R.

The basic line graph comes up just fine, but it does not show my error
bars...

Data frame = readscaphfileNEW
Plot name = SCAPHLINEGRAPHNEW
x axis = TEMP
y axis = SCAPH.BPM
Tracer = Year (SAME AS 'EXPERIMENT)
Scaphmeans = means of SCAPH.BPM
Scaphse = standard error of SCAPH.BPM

Here is the code..

SCAPHLINEGRAPHNEW <- interaction.plot(readscaphfileNEW$TEMP,
readscaphfileNEW$EXPERIMENT, readscaphfileNEW$SCAPH.BPM,
xlab = "Temperature (°C)", ylab = "Scaphognathite Rate (BPM)",
main = "Scaphognathite",
ylim = c(0,300), trace.label = "Year",
type = "b", pch = c(19,17), fixed = TRUE)
arrows(SCAPHLINEGRAPHNEW,Scaphmeans+Scaphse,SCAPHLINEGRAPHNEW,Scaphmeans-Scaphse,code=3,
angle=90, length=0.1)

Why are my error bars not showing? Is the 'arrows' line wrong?

Thanks a million for your help, everybody.

Here is my data set: 

> readscaphfileNEW
   EXPERIMENT TEMP SCAPH.BPM
1        2021   12        82
2        2021   12        58
3        2021   12        78
4        2021   12        59
5        2021   12        80
6        2021   12       100
7        2021   12        61
8        2021   12       103
9        2021   12        61
10       2021   17       100
11       2021   17        70
12       2021   17        83
13       2021   17        73
14       2021   17       143
15       2021   17       103
16       2021   17        73
17       2021   17       158
18       2021   17        95
19       2021   17        80
20       1939   12       158
21       1939   12       148
22       1939   12       152
23       1939   12       148
24       1939   12       160
25       1939   12       168
26       1939   12       152
27       1939   12       150
28       1939   12       187
29       1939   17       300
30       1939   17       302
31       1939   17       291
32       1939   17       240
33       1939   17       253
34       1939   17       207
35       1939   17       184
36       1939   17       224
37       1939   17       242
38       1939   17       236

Bruno



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