Why doesn't ggplot2 work with my dataframe time series

Question

I created a dataframe datos_f.csv with 5 columns (date, months, pp, tmax and tmin) from meteorological .csv data.

I've been trying to plot a time series using one of these variables and the dates, but ggplot2 doesn't plot. It only shows the axis.

I'm novice in R, but I'm trying different methods and nothing is working.

Thanks so much for reading!

My dataframe (with 16071 rows) is:

> head(datos_f)
       fecha   mes  pp tmax tmin
1  1970-01-01 Enero 0.0 29.9 18.2
2  1970-01-02 Enero 0.0 30.3 18.4
3  1970-01-03 Enero 0.0 31.0 18.0
4  1970-01-04 Enero 0.0 29.9 16.8
5  1970-01-05 Enero 0.0 30.2 19.4
6  1970-01-06 Enero 0.0 31.6 18.7
7  1970-01-07 Enero 0.0 32.2 17.8
8  1970-01-08 Enero 0.0 32.0 19.2
9  1970-01-09 Enero 0.0 34.2 18.8
10 1970-01-10 Enero 0.0 33.0 17.4
11 1970-01-11 Enero 0.0 32.8 17.2
12 1970-01-12 Enero 0.0 30.6 18.3
13 1970-01-13 Enero 0.0 33.2 19.4
14 1970-01-14 Enero 0.0 29.4 19.8
15 1970-01-15 Enero 3.9 29.8 20.0

I used this simple order:

ggplot(data=datos_f,aes(x=fecha,y=tmax),geom_point(size=2))

but this shows me an empty image with only the axis:

Any ideas?

You need ggplot(data=datos_f,aes(x=fecha,y=tmax)) + geom_point(size=2) Layers are added with a +. You might want to go through a ggplot2 tutorial to get start with the syntax; some are listed here: ggplot2.tidyverse.org — markus
– markus, Commented Jul 5, 2019 at 8:55
thanks so much!! Now it works!, that was so obvious t-t i dind´t notice. Sorry — Mary
– Mary, Commented Jul 5, 2019 at 9:02
If you do this often, you may want to know that there's actually a neat plot.xts-method implemented into xts package which I assume you're using. — jay.sf
– jay.sf, Commented Jul 5, 2019 at 9:07

ghosh'. · Accepted Answer · 2019-07-05 09:18:09Z

2

ggplot2 syntax is a little bit different from normal R syntaxes. It uses + operator.

ggplot(data=datos_f,aes(x=fecha,y=tmax)) + geom_point(size=2)

Here + operator overloads the function geom_point on the ggplot object

answered Jul 5, 2019 at 9:18

ghosh'.

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