[R] To plot and to extract info from a plot

David Winsemius dwinsemius at comcast.net
Sun Sep 20 02:05:08 CEST 2015

On Sep 19, 2015, at 3:25 PM, Jackson Rodrigues wrote:

> Hi everybody,
> I need help to plot (question 1) and to extract information from another
> plot (question 2). Could anyone help me? I will be very grateful.
> I do not know if I could enclose a figure here, so I saved it in my dropbox
> at
> https://www.dropbox.com/s/97ud54886cn6u8i/figure%20for%20r%20group.jpg?dl=0
> My questions are based on this figure.
> Question 1:
> The first figure (Figure 1) is a compilation of time series of some
> variables that I have to plot in parallel. However, this figure was made in
> adobe Illustrator because I could not plot these time series in parallel
> directly from R. Using R, I always get one box and one y axis for each
> plot. So, How to make a figure like this (several curves in paralel with 1
> y axis, and no x axis)  in R? I am asking because i have to plot about 50
> curves in parallel and doing it in R would save a long time.

Inase graphics you would plot one series with `plot()` then add additonal series with `lines()`
> Question 2:
> The second plot (Figure 2) is a smoothed curve through time in which each
> peak indicates an independent event. I would like to know when exactly on
> time (x axis) each one of these peaks ocurred. So, how to intercept the x
> axis at the maximum value of a peak.

This looks like a densityplot. There are methods in all three R 2-D graphics paradigms.

If you need worked examples you need to provide data. Learn to use dput() for that purpose.

> I appreciate any help.
> Jackson Rodrigues
> 	[[alternative HTML version deleted]]

And do read the Posting guide. This is a plain text mailing list.

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David Winsemius
Alameda, CA, USA

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