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Plot two graphs on one plot. function lines does not work

Submitted by capoluca on May 28, 2012

I want to plot two graphs on one plot. I read this post, but function lines does not work, nothing happens. I don't know what can be the problem. Any ideas?

Edit. reproducible example:

> tr_error
[1] 0.2314984 0.2314990 0.2314981 0.2314955 0.2314955 0.2314943 0.2314912
[8] 0.2314924
> tst_error
[1] 0.001461264 0.001461767 0.001461001 0.001459936 0.001459626 0.001458594
[7] 0.001457719 0.001458288
> plot(tst_error, type='l')
> lines(tr_error, type='l', col='red')

maybe there is second plot but it is higher?