I want to plot 2 integer[] vectors: a,b onto a factor[] vector: c ,

Question

Asked: May 30, 20262026-05-30T05:41:51+00:00 2026-05-30T05:41:51+00:00

I want to plot 2 integer[] vectors:a,b onto a factor[] vector:c, using the following code:

plot(c,a,type='l',col="blue",xlab="foo",ylab="bar")
lines(c,b,col="red")

Vector c contains strings such as: “2007-09-30 – 2007-10-06”.

I am facing two problems using this method:

The first call plots the vector as points, even though I have specified type='l' and ignores the argument col="blue".
Vector c is rather large and R is trying to fit every element as a discrete point on the x-axis, which is rather hideous.

The rendered output looks like this:
enter image description here

Does anyone have suggestions on how to fix my problems?

Thank you for your help!

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Editorial Team · Answer 1 · 2026-05-30T05:41:52+00:00

Editorial Team

Sorry, no time for an example right now, but here’s my feeble advice:

convert your factor, c to a Date class, at least for plotting. see ?Date

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