add diffrent geom_line to set of data by variable

[John Dieji]

Hi everyone,

Im new to ggplot and have a small problem for which I cant find a solution.

My plot works fine and everything is ok, I have only this problem:

My dataframe looks like this:

      date                              V1               V2                V3                V4           Color

1 2015-09-01 12:32:45    593.6667    1378.667     25.69695    104.50518      1

2 2015-09-02 13:10:10    627.0000    1300.667     34.39477     27.06166      1

3 2015-09-04 12:26:22    697.6667    1406.667     66.10850     50.56020      1

4 2015-09-01 12:32:45    557.6667    1359.333     20.79263     63.81484      2

5 2015-09-02 13:10:10    657.3333    1314.333     44.28694     91.11714      2

6 2015-09-04 12:26:22    653.0000    1313.333     31.09662     43.46646      2

And Im plotting with this code:

plot <- ggplot(df, aes(x=v1, y=v2), colour=color) +

           geom_line() +

           geom_point() 

So than I got my plot. The Problem is I want to have a plot where only data with the same color (or color value 1,2..) have a line between them. If im plotting with my code every point is bound together. But I only want to have a connection between data points which have the same colot value.

Im glad for every help,

best j

[Tim Richter-Heitmann]

I am sure you need to set the group-aesthetics in geom_line() to Color,
but without having an example dataset, i cant really tell. But
forgetting to set the group-argument in geom_line usually leads to
undesired results.
Maybe you can put forward your input data (as per dput(df)), so i can
have a look.

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[Doug Mitarotonda]

A couple of things:

1) to get what you want, you should see the `group` argument to `aes`

2) R is case sensitive, so your code would not work as written

3) by looking at your code you probably want to map Color in `aes`, not set it outside the argument

So, you probably want something like:

plot <- ggplot(df, aes(x=V1, y=V2, group = Color, color = Color)) +
           geom_line() +
           geom_point() 

But, you did not provide a reproducible example, so I can’t be sure this works. Please see https://github.com/hadley/devtools/wiki/Reproducibility on how to write a good question.

(just saw Tim responded while I typed this…)

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