Syntax error in ggplot Function in R

Question

I wanted to create automatic plot function by using following code:

plotTimeSeries <- list(temp1,temp2)

lapply(1:length(plotTimeSeries) , function(i) 
i$dt=strptime(i$dt, "%Y-%m-%d %H:%M:%S")
ggplot(i, aes(dt, ambtemp)) + geom_line() +
  scale_x_datetime(breaks = date_breaks("2 hour"),labels=date_format("%H:%M")) + xlab("Time 00.00 ~ 24:00 (2007-09-29)") + ylab("Ambient Tempreture")+
  opts(title = ("Node i")))

But I faced with the error below:

Error: unexpected ')' in:
"           scale_x_datetime(breaks = date_breaks("2 hour"),labels=date_format("%H:%M")) + xlab("Time 00.00 ~ 24:00 (2007-09-29)") + ylab("Ambient Tempreture")+
           opts(title = ("Node i")))"

Sample data properties:

'data.frame':   731 obs. of  2 variables:
 $ ambtemp: num  0.23 0.26 0.35 0.31 0.32 0.3 0.36 0.33 0.27 0.27 ...
 $ dt     : POSIXct, format: "2007-09-29 23:39:05" "2007-09-29 23:41:05" "2007-09-29 23:43:05" ...

Sample data:

temp1:

 surtemp    date_time
1    0.23 2007-09-29 23:39:05
2    0.26 2007-09-29 23:41:05
3    0.35 2007-09-29 23:43:05
4    0.31 2007-09-29 23:45:05
5    0.32 2007-09-29 23:47:05
6    0.30 2007-09-29 23:49:05

temp2:

     surtemp    date_time
1   -1.42 2007-09-28 23:39:09
2   -1.24 2007-09-28 23:41:09
3   -1.28 2007-09-28 23:43:09
4   -1.28 2007-09-28 23:45:09
5   -1.24 2007-09-28 23:47:09
6   -1.42 2007-09-28 23:49:09

No, I don not think problem cased because of that ')' since it goes back to the lapply(. If I remove the opts ')' the coresponding '(' should also be removed. After removing both I came up with other errors. — Topdombili
– Topdombili, Commented Jan 7, 2013 at 20:41
if you want both expressions (setting i$dt and running ggplot) to be executed in the body of the function, you need curly brackets {} around them — Ben Bolker
– Ben Bolker, Commented Jan 7, 2013 at 20:45
@BenBolker, I have tried that as: plotTimeSeries <- list(n25_30,n25_29) lapply{1:length(plotTimeSeries) , function(i) i$dt=strptime(i$dt, "%Y-%m-%d %H:%M:%S") ggplot(i, aes(dt, ambtemp)) + geom_line() + scale_x_datetime(breaks = date_breaks("2 hour"),labels=date_format("%H:%M")) + xlab("Time 00.00 ~ 24:00 (2007-09-29)") + ylab("Ambient Tempreture")+ opts(title = ("Node i"))}. However, the problem still exist. — Topdombili
– Topdombili, Commented Jan 7, 2013 at 20:48
No, the curly brackets go around the body of the function. Iterative syntax debugging is frustrating. Can you please post a reproducible example tinyurl.com/reproducible-000 ? — Ben Bolker
– Ben Bolker, Commented Jan 7, 2013 at 20:51
unreproducible example is unreproducible. Try making it simpler and simpler and eventually you'll hit the one thing that is breaking it. — Spacedman
– Spacedman, Commented Jan 7, 2013 at 20:52

Ben Bolker · Accepted Answer · 2013-01-07 21:04:53Z

1

I think it would be less confusing to revert to a for loop. Try:

plotTimeSeries <- list(temp1,temp2,temp3,temp4)
for (i in plotTimeSeries) {
   i$dt <- strptime(i$dt, "%Y-%m-%d %H:%M:%S")
   ggplot(i, aes(dt, ambtemp)) + geom_line() +
     scale_x_datetime(breaks = date_breaks("2 hour"),
                      labels=date_format("%H:%M")) + 
       labs(x="Time 00.00 ~ 24:00 (2007-09-29)",y="Ambient Temperature",
           title = (paste("Node",i)))
}

edited Jan 7, 2013 at 21:04

answered Jan 7, 2013 at 20:57

Ben Bolker

230k26 gold badges405 silver badges497 bronze badges

Sign up to request clarification or add additional context in comments.

7 Comments

Topdombili Over a year ago

Now, I faced with this error: 'opts' is deprecated. Use 'theme' instead. (Deprecated; last used in version 0.9.1) Setting the plot title with opts(title="...") is deprecated. Use labs(title="...") or ggtitle("...") instead. (Deprecated; last used in version 0.9.1) 'opts' is deprecated. Use 'theme' instead. (Deprecated; last used in version 0.9.1) Setting the plot title with opts(title="...") is deprecated. Use labs(title="...") or ggtitle("...") instead. (Deprecated; last used in version 0.9.1)

Ben Bolker Over a year ago

did you try switching from opts to theme as suggested by the error message???(!)??? (I edited my answer)

Topdombili Over a year ago

But by using theme I cannot utilize 'i'. I came up with a new error: Error in function (el, elname) : Element title must be a element_text object.

Ben Bolker Over a year ago

I'm sorry, someone else will have to help you. I can't keep doing this without a reproducible example. Good luck ...

IRTFM Over a year ago

@Topdombili: It's an R-FAQ that inside for-loops you need to print the ggplot object.

|

Collectives™ on Stack Overflow

Syntax error in ggplot Function in R

1 Answer 1

7 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

7 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related