[R] multiple lines with the same data frame?

[R. Michael Weylandt]

There are indeed many, many ways in R to do something like you've
described. If you are just a beginner, I'd recommend something simple:

suppose your data is called df and the columns named are "id", "x'',
and "y" respectively.

with(df, plot(x[id == 1], y[id==1], ylim = range(y), type="l")
# Call plot to set up the plot using the data for the first category.
The only tweak we make is to extend the y axis to cover all the y's we
might see; we also use a type="l" to get a line instead of points.

for (i in 2:10) {
    with(df, lines(x[id == i], y[id == i], col = i))
}
# Loop over the other categories and add them to our plot with the
lines() command; note that you wouldn't use plot directly because it
starts a new plot (most of the time)

This sort of stuff should be covered in any beginners manual, but
hopefully this gets you off to a good start.

Michael Weylandt



On Mon, Oct 17, 2011 at 11:58 AM, Adel ESSAFI <adelessafi at gmail.com> wrote:
> Bonjour
>
> I have this data frame and I am newbie in R.
> I want to ask if it is possible to draw 10 lines in a plot such that: a line
> for every colomn, the x - axis is the second column and the y-axis is the
> third one.
>
> Thank you for any input
>
>
> 1   0  1094442
> 1   0.2  1163576.2
> 1   0.4  1238539.6
> 1   0.6  1303510.4
> 1   0.8  1376573.2
> 1   1  1454175
> 2   0  1076068
> 2   0.2  1139246
> 2   0.4  1212344
> 2   0.6  1277591.8
> 2   0.8  1346156.6
> 2   1  1410058
> 3   0  1097901
> 3   0.2  1173643.2
> 3   0.4  1258849.8
> 3   0.6  1343001.6
> 3   0.8  1427705.8
> 3   1  1507793
> 4   0  1197047
> 4   0.2  1292918.6
> 4   0.4  1383640.8
> 4   0.6  1480487.8
> 4   0.8  1571557.6
> 4   1  1659578
> 5   0  1120010
> 5   0.2  1200076.6
> 5   0.4  1279653
> 5   0.6  1360494.6
> 5   0.8  1437223.2
> 5   1  1512636
> 6   0  1082650
> 6   0.2  1154676.6
> 6   0.4  1223416.6
> 6   0.6  1297593.6
> 6   0.8  1366764.6
> 6   1  1432705
> 7   0  1023590
> 7   0.2  1077783.8
> 7   0.4  1133154.2
> 7   0.6  1190296
> 7   0.8  1244411.4
> 7   1  1297709
> 8   0  1042257
> 8   0.2  1107452.8
> 8   0.4  1174574.8
> 8   0.6  1238547.6
> 8   0.8  1301507.6
> 8   1  1363338
> 9   0  1066917
> 9   0.2  1136411.8
> 9   0.4  1202822
> 9   0.6  1273514.8
> 9   0.8  1340641.8
> 9   1  1408249
> 10   0  1069685
> 10   0.2  1138909
> 10   0.4  1213284.2
> 10   0.6  1282508.8
> 10   0.8  1346093.2
> 10   1  1410707
>
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