Hello, I'm working with R language, and plotting some parameters over time. I need to draw a shaded area under the curve of eacj parameter. For that, I might use the polygon (x,y) function, assigning coordinates (x,y) to each vertex of my polygon. To do so, "x" and "y" must be vectors with numerical values, but since my x-axis is a time series, I cannot assing a numerical value to my "x" coordinate, because time variable is a "character" variable. Is there any option to use the function polygin (x,y) in this case, or any other function that allows me to draw a shaded area under the curve on a time series basis? Thank you in advance for your help Best regards ?scar
Shaded areas in R
3 messages · Óscar Jiménez, Tom, Duncan Murdoch
Hi ?scar, Not really sure what you mean by the time variable being a "character" vector. Unless you are plotting a barchart or boxplot (or similar), I don't this this makes sense. If you can post a sample of your data, preferably using the dput() command we can probably help more. On Thu, May 26, 2016 at 5:37 AM, ?scar Jim?nez
<oscar.jimenez.fdez at gmail.com> wrote:
Hello,
I'm working with R language, and plotting some parameters over time. I need
to draw a shaded area under the curve of eacj parameter.
For that, I might use the polygon (x,y) function, assigning coordinates
(x,y) to each vertex of my polygon. To do so, "x" and "y" must be vectors
with numerical values, but since my x-axis is a time series, I cannot
assing a numerical value to my "x" coordinate, because time variable is a
"character" variable.
Is there any option to use the function polygin (x,y) in this case, or any
other function that allows me to draw a shaded area under the curve on a
time series basis?
Thank you in advance for your help
Best regards
?scar
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On 26/05/2016 5:37 AM, ?scar Jim?nez wrote:
Hello, I'm working with R language, and plotting some parameters over time. I need to draw a shaded area under the curve of eacj parameter. For that, I might use the polygon (x,y) function, assigning coordinates (x,y) to each vertex of my polygon. To do so, "x" and "y" must be vectors with numerical values, but since my x-axis is a time series, I cannot assing a numerical value to my "x" coordinate, because time variable is a "character" variable. Is there any option to use the function polygin (x,y) in this case, or any other function that allows me to draw a shaded area under the curve on a time series basis?
Times and dates just print like characters, they aren't actually characters. For example, x <- Sys.Date() + 1:20 y <- rnorm(20) plot(y ~ x) polygon(c(x, x[20], x[1]), c(y, 0, 0), col="gray") Duncan Murdoch