Numeric axis labels in incorrect order

Question

I have the following generated data frame called Raw_Data:

    Time Velocity Type
1    10        1    a
2    20        2    a
3    30        3    a
4    40        4    a
5    50        5    a
6    10        2    b
7    20        4    b
8    30        6    b
9    40        8    b
10   50        9    b
11   10        3    c
12   20        6    c
13   30        9    c
14   40       11    c
15   50       13    c

When plotting each Type, with the following:

ggplot(Raw_Data, aes(x=Time, y=Velocity))+geom_point() + facet_grid(Type ~.)

the y-axis increments as:

1, 11, 13, 2, 3, 4, 5, 6, 7, 8, 9

The y-axis labels should be in order - why has 11 and 12 appeared after 1?

Can you show a dput of your example? Try by calling Raw_Data$Velocity <- factor(Raw_Data$Velocity) — akrun
– akrun, Commented Jul 16, 2016 at 16:39

Jaap · Accepted Answer · 2016-07-16 17:50:35Z

1

I have created the data frame as follows using your sample data:

mydata <- read.table(text="Time Velocity Type
1    10        1    a
2    20        2    a
3    30        3    a
4    40        4    a
5    50        5    a
6    10        2    b 
7    20        4    b
8    30        6    b
9    40        8    b
10   50        9    b
11   10        3    c
12   20        6    c
13   30        9    c
14   40       11    c
15   50       13    c", header=TRUE)

Followed by the command

ggplot(mydata, aes(x=Time, y=Velocity))+geom_point() + facet_grid(Type ~.)

which correctly displays the plot as shown in picture below

Note: changing the call to ggplot as shown below:

ggplot(mydata, aes(x=Time, y=as.character(Velocity))) +
  geom_point() +
  facet_grid(Type ~.)

reproduces the problem you mentioned. So you need to convert the Velocity variable to appropriate type i.e. integer in your case.

edited Jul 16, 2016 at 17:50

Jaap

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answered Jul 16, 2016 at 16:45

Imran Ali

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2 Comments

Jaap Over a year ago

It is better to include above comment in the answer, instead of in a comment.

Imran Ali Over a year ago

@ProcrastinatusMaximus, included the comment inside answer as you suggested.

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