Gradient color to a line graph

On Feb 4, 2017, at 9:14 AM, Riyas MJ <riyasmjgeo at gmail.com> wrote:

Hi all,

I am a new user of R. I just did my first real program.
I would like to know how to put a gradient (like rainbow() or topo.colors,
etc) to a* line* graph.

Example:
ar1=array(data=1:10,dim=9)
ar2=array(data=11:20,dim=9)
plot(ar1,ar2,type="l",col="red",lwd=3)

Instead of a red color, I would like to make it in rainbow colors.
Tried to do my own and tried searching but everywhere its about giving
gradient to point graph, not to a line graph. Please help, it is needed for

You haven't indicated what information you want to convey with this
gradient.

You also are using arrays where you should be using vectors, usually
stored in a data frame.

Here is one way using the contributed package ggplot2:

library(ggplot2)
DF <- data.frame( V1=1:10, V2=11:20, C=21:30 )
p <- ggplot( DF, aes( x=V1, y=V2, colour=C ) ) +
    geom_line( size=2 ) +
    scale_colour_gradient( low="red", high="blue" )
print( p )


--
Sent from my phone. Please excuse my brevity.

On February 4, 2017 12:19:14 PM PST, David Winsemius <
dwinsemius at comcast.net> wrote:

On Feb 4, 2017, at 9:14 AM, Riyas MJ <riyasmjgeo at gmail.com> wrote:

Hi all,

I am a new user of R. I just did my first real program.
I would like to know how to put a gradient (like rainbow() or

topo.colors,

etc) to a* line* graph.

Example:
ar1=array(data=1:10,dim=9)
ar2=array(data=11:20,dim=9)
plot(ar1,ar2,type="l",col="red",lwd=3)

Instead of a red color, I would like to make it in rainbow colors.
Tried to do my own and tried searching but everywhere its about

giving

gradient to point graph, not to a line graph. Please help, it is

needed for

Install the plotrix package and look in its Index page for a function
name that has both `color` and `line` in its name.