[R] Arranging column data to create plots

[Ulrik Stervbo]

Hi Michael,

Try gather from the tidyr package

HTH
Ulrik

Michael Reed via R-help <r-help at r-project.org> schrieb am So., 16. Juli
2017, 10:19:

> Dear All,
>
> I need some help arranging data that was imported.
>
> The imported data frame looks something like this (the actual file is
> huge, so this is example data)
>
> DF:
> IDKey  X1  Y1  X2  Y2  X3  Y3  X4  Y4
> Name1  21  15  25  10
> Name2  15  18  35  24  27  45
> Name3  17  21  30  22  15  40  32  55
>
> I would like to create a new data frame with the following
>
> NewDF:
> IDKey   X   Y
> Name1  21  15
> Name1  25  10
> Name2  15  18
> Name2  35  24
> Name2  27  45
> Name3  17  21
> Name3  30  22
> Name3  15  40
> Name3  32  55
>
> With the data like this I think I can do the following
>
> ggplot(NewDF, aes(x=X, y=Y, color=IDKey) + geom_line
>
> and get 3 lines with the various number of points.
>
> The point is that each of the XY pairs is a data point tied to NameX.  I
> would like to rearrange the data so I can plot the points/lines by the
> IDKey.  There will be at least 2 points, but the number of points for each
> IDKey can be as many as 4.
>
> I have tried using the gather() function from the tidyverse package, but I
> can't make it work.  The issue is that I believe I need two separate gather
> statements (one for X, another for Y) to consolidate the data.  This causes
> the pairs to not stay together and the data becomes jumbled.
>
> Thoughts
> Thanks for your help
>
> Michael E. Reed
>
>
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