how to plot temperatures with ggplot2

[Jean-Michel Richer]

Hi everybody,

I am trying to plot minimum, maximum and average temperatures for a very simple data file.

However I get different errors like:

- geom_path: Each group consists of only one observation. Do you need to adjust

the group aesthetic?

- Don't know how to automatically pick scale for object of type uneval. Defaulting to continuous

Error: Aesthetics must be either length 1 or the same as the data (12): x

So nothing I do is working, I am looking for some help !

Here is my input file (table)

# read file

temperatures <- read.table("temperatures.rt", header=T)

> temperatures

   month minT maxT

1    jan    6   22

2    feb    8   24

3    mar    9   26

4    apr   12   27

5    mai   13   27

6    jun   14   25

7    jul   13   24

8    aug   13   24

9    sep   13   23

10   oct   11   23

11   nov    8   22

12   dec    6   22

First I get some problem concerning the months, so I transformed as:

temperatures$month = factor(temperatures$month, levels=temperatures$month)

but then everything I do leads me to errors that I am unable to solve.

Regards,

JM

[Roman Luštrik]

Can you provide your dataset in an easy-to-paste form? What is your code for plotting?

Where in your dataset is average temperature specified?

Cheers,

Roman

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[Roman Luštrik]

Please keep the list in the loop. Looking at your data, it would seem you first need to make it into the right format - long format. You can do that using tidyr::gather. Plotting from then on is trivial. Also notice that I'm not calling any column name explicitly from the object, but rather just referring to the name.

xy <- read.table("../Downloads/temperatures.rt", header = TRUE)

xy$meanT <- with(xy, (minT + maxT)/2) # with regular warnings that this implies that the distribution is symmetrical...

# this ensures that the months are plotted in the correct, specified order

xy$month <- factor(xy$month, levels = xy$month)

library(tidyr)

library(ggplot2)

# put your data into long format suitable to be used in ggplot()

xy <- gather(xy, key = temp, value = value, -month)

ggplot(xy, aes(x = month, y = value, color = temp, group = temp)) +

  theme_bw() +

  scale_color_brewer(palette = "Set1") +

  geom_line()

Cheers,

Roman