R: ggplot2: Unable to plot points from a data.frame

Question

So I want to do a simple plot where the following x-coordinates should be plotted as points. This is what my data.frame looks like:

Now I have tried to do it as simple as possible:

gap_plot <- ggplot() + geom_point(data=gaps, aes(x=gap_pos))

Then the following error occurred:

Error in exists(name, envir = env, mode = mode) : 
argument "env" is missing, with no default

What can I do about this? I am totally stuck.

Edit:

The following two lines do not return an error but still do not plot anything.

gap_plot <- ggplot() + geom_point(data=gaps, aes(x=gap_pos , y = gap_pos))
gap_plot <- ggplot() + geom_point(data=gaps, aes(x=gap_pos , y = 1))

for geom_point() you should supply both x and y coordinates — Nader Hisham
– Nader Hisham, Commented Jun 9, 2015 at 11:06
If I add y=1 it returns no error but it also does not plot anything. — JadenBlaine
– JadenBlaine, Commented Jun 9, 2015 at 11:10
if you want to plot only these points you can assign y to be the same value of x so it will be something like this gap_plot <- ggplot() + geom_point(data=gaps, aes(x=gap_pos , y = gap_pos)) but I'm not sure if you want this result — Nader Hisham
– Nader Hisham, Commented Jun 9, 2015 at 11:14
It's the same result like adding y =1 it returns no error anymore but it does not plot anything :/ — JadenBlaine
– JadenBlaine, Commented Jun 9, 2015 at 11:16
No , It should work fine I think you're not executing the plot try to run gap_plot , check this code gap_plot <- ggplot() + geom_point(data=gaps, aes(x=gap_pos , y = gap_pos)) gap_plot — Nader Hisham
– Nader Hisham, Commented Jun 9, 2015 at 11:21

mts · Accepted Answer · 2015-06-09 12:03:08Z

1

This should work

gaps = data.frame(gap.pos = c(50646312, 50647076, 50647511, 50647512, 50647513, 50647546))
gap_plot <- ggplot(gaps) + geom_point(aes(x=gap.pos, y=1))

you have to call the plot you produced to actually see the plot

gap_plot

edited Jun 9, 2015 at 12:03

answered Jun 9, 2015 at 11:53

mts

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3 Comments

Spacedman Over a year ago

A simple y=1 will work - the 1 gets repeated. Normal R recycling rules dont apply though, it has to be length 1 or the same length as the data.

mts Over a year ago

@Spacedman true and I edited. Interestingly the OP came up with that very solution themselves but reported it doesn't produce a plot. I guess the problem is that the plot was only produced but not called afterwards as pointed out in the comments above.

JadenBlaine Over a year ago

The problem was that my graphics device got a bug. After I called dev.close() your solutions worked fine

Spacedman · Accepted Answer · 2015-06-09 11:46:38Z

1

You have to give a y aesthetic for points. I'd add a factor with a single level to make a nice y axis:

> gap=data.frame(gap_pos=c(50646312, 50647076, 50647511, 50647512, 50647513, 50647513, 50647546))
> gap$data=factor("Data")
> ggplot() + geom_point(data=gap, aes(x=gap_pos, y=data))+ylab("")

Which gives: single Y plot

answered Jun 9, 2015 at 11:46

Spacedman

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