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List:       r-help
Subject:    Re: [R] ggplot2::geom_path() in a loop problems.
From:       Jeff Newmiller <jdnewmil () dcn ! davis ! ca ! us>
Date:       2021-04-24 23:46:00
Message-ID: 224AA617-2198-42AC-B60C-D9B9912F1577 () dcn ! davis ! ca ! us
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Sigh. Don't do this. Setup your data frame with all the data you want to plot and \
give it to one geom. Use group columns such as factors (e.g. color, size, linetype, \
etc) to distinguish them.

Using multiple geoms with different mappings is usually a recipe for disappointment. \
It also fails to create legible legends.

On April 24, 2021 2:21:01 PM PDT, "Martin Møller Skarbiniks Pedersen" \
<traxplayer@gmail.com> wrote:
> On Fri, 23 Apr 2021 at 20:51, Chris Evans <chrishold@psyctc.org> wrote:
> > 
> > I may be quite wrong but isn't the for loop in the second example
> simply
> overwriting/replacing the first p2 with the second whereas the p1
> version
> is adding the paths to p1.
> > 
> > (If you see what I mean, I don't think I have expressed that very
> well.)
> > 
> > Very best (all),
> > 
> > Chris
> 
> 
> Hi Chris,
> Thanks for your email. However I don't think that is the problem.
> Same problem here:
> 
> library(ggplot2)
> 
> df <- data.frame(x = c(0,25,0,-25,0), y = c(25,0,-25,0,25))
> p1 <- ggplot()
> p1 <- p1 + geom_path(data = df,aes(x = x/1, y = y/1))
> p1 <- p1 + geom_path(data = df,aes(x = x/2, y = y/2))
> p1 <- p1 + xlim(-30,30)
> p1 <- p1 + ylim(-30,30)
> p1
> 
> df <- data.frame(x = c(0,25,0,-25,0), y = c(25,0,-25,0,25))
> p3 <- ggplot()
> idx <- 1
> p3 <- p3 + geom_path(data = df,aes(x = x/idx, y = y/idx))
> idx <- 2
> p3 <- p3 + geom_path(data = df,aes(x = x/idx, y = y/idx))
> p3 <- p3 + xlim(-30,30)
> p3 <- p3 + ylim(-30,30)
> p3
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
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-- 
Sent from my phone. Please excuse my brevity.

______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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