also from this site: https://plotly.com/ggplot2/geom_ribbon/
I get the answer is geom_ribbon but I am still missing something
```
#! plot
p = ggplot(data = trainset, aes(x=x, y=y, color=z)) +
geom_point() + scale_color_manual(values = c("red",
"blue"))
# show support vectors
df_sv = trainset[svm_model$index, ]
p = p + geom_point(data = df_sv, aes(x=x, y=y),
color="purple", size=4, alpha=0.5)
# show hyperplane (decision boundaries are off set by 1/w[2])
w = t(svm_model$coefs) %*% svm_model$SV # %*% = matrix multiplication
slope_1 = -w[1]/w[2]
intercept_1 = svm_model$rho / w[2]
p = p + geom_abline(slope = slope_1, intercept = intercept_1, col
"royalblue4")
p = p + geom_ribbon(aes(ymin=intercept_1 - 1/w[2],
ymax=intercept_1 + 1/w[2],
x=x, fill = "band"), alpha = 0.3) +
scale_fill_manual("",values="grey12")
```
On Fri, Oct 23, 2020 at 10:26 AM PIKAL Petr <petr.pikal at precheza.cz>
wrote:>
> Hi
>
> Did you try google? I got several answers using your question
>
> e.g.
>
https://stackoverflow.com/questions/54687321/fill-area-between-lines-using-g
> gplot-in-r
>
> Cheers
> Petr
>
> > -----Original Message-----
> > From: R-help <r-help-bounces at r-project.org> On Behalf Of
Luigi Marongiu
> > Sent: Friday, October 23, 2020 9:59 AM
> > To: r-help <r-help at r-project.org>
> > Subject: [R] How to shade area between lines in ggplot2
> >
> > Hello,
> > I am running SVM and showing the results with ggplot2. The results
include
> > the decision boundaries, which are two dashed lines parallel to a
solid
> line. I
> > would like to remove the dashed lines and use a shaded area instead.
How
> > can I do that?
> > Here is the code I wrote..
> > ```
> > library(e1071)
> > library(ggplot2)
> >
> > set.seed(100)
> > x1 = rnorm(100, mean = 0.2, sd = 0.1)
> > y1 = rnorm(100, mean = 0.7, sd = 0.1)
> > y2 = rnorm(100, mean = 0.2, sd = 0.1)
> > x2 = rnorm(100, mean = 0.75, sd = 0.1)
> > df = data.frame(x = c(x1,x2), y=c(y1,y2),
> > z=c(rep(0, length(x1)), rep(1, length(x2)))) df$z >
factor(c(rep(0,
> > length(x1)), rep(1, length(x2)))) df[, "train"] <-
ifelse(runif(nrow(df))
> < 0.8, 1, 0)
> > trainset <- df[df$train == 1, ] testset <- df[df$train == 0, ]
trainColNum
> <-
> > grep("train", names(df)) trainset <- trainset[,
-trainColNum] testset <-
> testset[,
> > -trainColNum] head(trainset); str(df)
> >
> > svm_model<- svm(z ~ .,
> > data = trainset,
> > type = "C-classification",
> > kernel = "linear",
> > scale = FALSE)
> >
> > #! plot
> > p = ggplot(data = trainset, aes(x=x, y=y, color=z)) +
> > geom_point() + scale_color_manual(values = c("red",
"blue")) # show
> > decision boundaries w = t(svm_model$coefs) %*% svm_model$SV # %*%
> > matrix multiplication
> > slope_1 = -w[1]/w[2]
> > intercept_1 = svm_model$rho / w[2]
> > p = p + geom_abline(slope = slope_1, intercept = intercept_1) ### here
we
> go:
> > can I use a shaded area between these two lines? ### p = p +
> > geom_abline(slope = slope_1, intercept = intercept_1 - 1/w[2],
> > linetype = "dashed") +
> > geom_abline(slope = slope_1, intercept = intercept_1 + 1/w[2],
> > linetype = "dashed")
> > print(p)
> >
> > ```
> >
> > Thank you
> >
> > --
> > Best regards,
> > Luigi
> >
> > ______________________________________________
> > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide http://www.R-project.org/posting-
> > guide.html
> > and provide commented, minimal, self-contained, reproducible code.
--
Best regards,
Luigi
Hi What about something like p+geom_ribbon(aes(ymin = slope_1*x + intercept_1 - 1/w[2], ymax = slope_1*x + intercept_1 + 1/w[2], fill = "grey70", alpha=0.1)) Cheers Petr> -----Original Message----- > From: Luigi Marongiu <marongiu.luigi at gmail.com> > Sent: Friday, October 23, 2020 11:11 AM > To: PIKAL Petr <petr.pikal at precheza.cz> > Cc: r-help <r-help at r-project.org> > Subject: Re: [R] How to shade area between lines in ggplot2 > > also from this site: https://plotly.com/ggplot2/geom_ribbon/ > I get the answer is geom_ribbon but I am still missing something ``` #! plot > p > = ggplot(data = trainset, aes(x=x, y=y, color=z)) + > geom_point() + scale_color_manual(values = c("red", "blue")) # show > support vectors df_sv = trainset[svm_model$index, ] p = p + > geom_point(data = df_sv, aes(x=x, y=y), > color="purple", size=4, alpha=0.5) # show hyperplane > (decision > boundaries are off set by 1/w[2]) w = t(svm_model$coefs) %*% > svm_model$SV # %*% = matrix multiplication > slope_1 = -w[1]/w[2] > intercept_1 = svm_model$rho / w[2] > p = p + geom_abline(slope = slope_1, intercept = intercept_1, col > "royalblue4") > p = p + geom_ribbon(aes(ymin=intercept_1 - 1/w[2], > ymax=intercept_1 + 1/w[2], > x=x, fill = "band"), alpha = 0.3) + > scale_fill_manual("",values="grey12") > ``` > > On Fri, Oct 23, 2020 at 10:26 AM PIKAL Petr <petr.pikal at precheza.cz> wrote: > > > > Hi > > > > Did you try google? I got several answers using your question > > > > e.g. > > https://stackoverflow.com/questions/54687321/fill-area-between-lines-u > > sing-g > > gplot-in-r > > > > Cheers > > Petr > > > > > -----Original Message----- > > > From: R-help <r-help-bounces at r-project.org> On Behalf Of Luigi > > > Marongiu > > > Sent: Friday, October 23, 2020 9:59 AM > > > To: r-help <r-help at r-project.org> > > > Subject: [R] How to shade area between lines in ggplot2 > > > > > > Hello, > > > I am running SVM and showing the results with ggplot2. The results > > > include the decision boundaries, which are two dashed lines parallel > > > to a solid > > line. I > > > would like to remove the dashed lines and use a shaded area instead. > > > How can I do that? > > > Here is the code I wrote.. > > > ``` > > > library(e1071) > > > library(ggplot2) > > > > > > set.seed(100) > > > x1 = rnorm(100, mean = 0.2, sd = 0.1) > > > y1 = rnorm(100, mean = 0.7, sd = 0.1) > > > y2 = rnorm(100, mean = 0.2, sd = 0.1) > > > x2 = rnorm(100, mean = 0.75, sd = 0.1) df = data.frame(x = c(x1,x2), > > > y=c(y1,y2), > > > z=c(rep(0, length(x1)), rep(1, length(x2)))) df$z > > factor(c(rep(0, > > > length(x1)), rep(1, length(x2)))) df[, "train"] <- > > > ifelse(runif(nrow(df)) > > < 0.8, 1, 0) > > > trainset <- df[df$train == 1, ] testset <- df[df$train == 0, ] > > > trainColNum > > <- > > > grep("train", names(df)) trainset <- trainset[, -trainColNum] > > > testset <- > > testset[, > > > -trainColNum] head(trainset); str(df) > > > > > > svm_model<- svm(z ~ ., > > > data = trainset, > > > type = "C-classification", > > > kernel = "linear", > > > scale = FALSE) > > > > > > #! plot > > > p = ggplot(data = trainset, aes(x=x, y=y, color=z)) + > > > geom_point() + scale_color_manual(values = c("red", "blue")) # > > > show decision boundaries w = t(svm_model$coefs) %*% svm_model$SV > # > > > %*% = matrix multiplication > > > slope_1 = -w[1]/w[2] > > > intercept_1 = svm_model$rho / w[2] > > > p = p + geom_abline(slope = slope_1, intercept = intercept_1) ### > > > here we > > go: > > > can I use a shaded area between these two lines? ### p = p + > > > geom_abline(slope = slope_1, intercept = intercept_1 - 1/w[2], > > > linetype = "dashed") + > > > geom_abline(slope = slope_1, intercept = intercept_1 + 1/w[2], > > > linetype = "dashed") > > > print(p) > > > > > > ``` > > > > > > Thank you > > > > > > -- > > > Best regards, > > > Luigi > > > > > > ______________________________________________ > > > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > > > https://stat.ethz.ch/mailman/listinfo/r-help > > > PLEASE do read the posting guide http://www.R-project.org/posting- > > > guide.html and provide commented, minimal, self-contained, > > > reproducible code. > > > > -- > Best regards, > Luigi
Thank you, but this split the area into two and distorts the shape of
the plot. (compared to
```
p + geom_abline(slope = slope_1, intercept = intercept_1 - 1/w[2],
linetype = "dashed", col = "royalblue")
+
geom_abline(slope = slope_1, intercept = intercept_1 + 1/w[2],
linetype = "dashed", col = "royalblue")
```
Why there is a hole in the middle of the ribbon? and the color is not grey...
On Fri, Oct 23, 2020 at 2:35 PM PIKAL Petr <petr.pikal at precheza.cz>
wrote:>
> Hi
>
> What about something like
>
> p+geom_ribbon(aes(ymin = slope_1*x + intercept_1 - 1/w[2],
> ymax = slope_1*x + intercept_1 + 1/w[2], fill = "grey70",
alpha=0.1))
>
> Cheers
> Petr
>
> > -----Original Message-----
> > From: Luigi Marongiu <marongiu.luigi at gmail.com>
> > Sent: Friday, October 23, 2020 11:11 AM
> > To: PIKAL Petr <petr.pikal at precheza.cz>
> > Cc: r-help <r-help at r-project.org>
> > Subject: Re: [R] How to shade area between lines in ggplot2
> >
> > also from this site: https://plotly.com/ggplot2/geom_ribbon/
> > I get the answer is geom_ribbon but I am still missing something ```
#! plot
> > p
> > = ggplot(data = trainset, aes(x=x, y=y, color=z)) +
> > geom_point() + scale_color_manual(values = c("red",
"blue")) # show
> > support vectors df_sv = trainset[svm_model$index, ] p = p +
> > geom_point(data = df_sv, aes(x=x, y=y),
> > color="purple", size=4, alpha=0.5) # show
hyperplane
> > (decision
> > boundaries are off set by 1/w[2]) w = t(svm_model$coefs) %*%
> > svm_model$SV # %*% = matrix multiplication
> > slope_1 = -w[1]/w[2]
> > intercept_1 = svm_model$rho / w[2]
> > p = p + geom_abline(slope = slope_1, intercept = intercept_1, col >
> "royalblue4")
> > p = p + geom_ribbon(aes(ymin=intercept_1 - 1/w[2],
> > ymax=intercept_1 + 1/w[2],
> > x=x, fill = "band"), alpha =
0.3) +
> > scale_fill_manual("",values="grey12")
> > ```
> >
> > On Fri, Oct 23, 2020 at 10:26 AM PIKAL Petr <petr.pikal at
precheza.cz> wrote:
> > >
> > > Hi
> > >
> > > Did you try google? I got several answers using your question
> > >
> > > e.g.
> > >
https://stackoverflow.com/questions/54687321/fill-area-between-lines-u
> > > sing-g
> > > gplot-in-r
> > >
> > > Cheers
> > > Petr
> > >
> > > > -----Original Message-----
> > > > From: R-help <r-help-bounces at r-project.org> On
Behalf Of Luigi
> > > > Marongiu
> > > > Sent: Friday, October 23, 2020 9:59 AM
> > > > To: r-help <r-help at r-project.org>
> > > > Subject: [R] How to shade area between lines in ggplot2
> > > >
> > > > Hello,
> > > > I am running SVM and showing the results with ggplot2. The
results
> > > > include the decision boundaries, which are two dashed lines
parallel
> > > > to a solid
> > > line. I
> > > > would like to remove the dashed lines and use a shaded area
instead.
> > > > How can I do that?
> > > > Here is the code I wrote..
> > > > ```
> > > > library(e1071)
> > > > library(ggplot2)
> > > >
> > > > set.seed(100)
> > > > x1 = rnorm(100, mean = 0.2, sd = 0.1)
> > > > y1 = rnorm(100, mean = 0.7, sd = 0.1)
> > > > y2 = rnorm(100, mean = 0.2, sd = 0.1)
> > > > x2 = rnorm(100, mean = 0.75, sd = 0.1) df = data.frame(x =
c(x1,x2),
> > > > y=c(y1,y2),
> > > > z=c(rep(0, length(x1)), rep(1, length(x2))))
df$z > > > factor(c(rep(0,
> > > > length(x1)), rep(1, length(x2)))) df[, "train"]
<-
> > > > ifelse(runif(nrow(df))
> > > < 0.8, 1, 0)
> > > > trainset <- df[df$train == 1, ] testset <- df[df$train
== 0, ]
> > > > trainColNum
> > > <-
> > > > grep("train", names(df)) trainset <- trainset[,
-trainColNum]
> > > > testset <-
> > > testset[,
> > > > -trainColNum] head(trainset); str(df)
> > > >
> > > > svm_model<- svm(z ~ .,
> > > > data = trainset,
> > > > type = "C-classification",
> > > > kernel = "linear",
> > > > scale = FALSE)
> > > >
> > > > #! plot
> > > > p = ggplot(data = trainset, aes(x=x, y=y, color=z)) +
> > > > geom_point() + scale_color_manual(values =
c("red", "blue")) #
> > > > show decision boundaries w = t(svm_model$coefs) %*%
svm_model$SV
> > #
> > > > %*% = matrix multiplication
> > > > slope_1 = -w[1]/w[2]
> > > > intercept_1 = svm_model$rho / w[2]
> > > > p = p + geom_abline(slope = slope_1, intercept =
intercept_1) ###
> > > > here we
> > > go:
> > > > can I use a shaded area between these two lines? ### p = p +
> > > > geom_abline(slope = slope_1, intercept = intercept_1 -
1/w[2],
> > > > linetype = "dashed") +
> > > > geom_abline(slope = slope_1, intercept = intercept_1 +
1/w[2],
> > > > linetype = "dashed")
> > > > print(p)
> > > >
> > > > ```
> > > >
> > > > Thank you
> > > >
> > > > --
> > > > Best regards,
> > > > Luigi
> > > >
> > > > ______________________________________________
> > > > R-help at r-project.org mailing list -- To UNSUBSCRIBE and
more, see
> > > > https://stat.ethz.ch/mailman/listinfo/r-help
> > > > PLEASE do read the posting guide
http://www.R-project.org/posting-
> > > > guide.html and provide commented, minimal, self-contained,
> > > > reproducible code.
> >
> >
> >
> > --
> > Best regards,
> > Luigi
--
Best regards,
Luigi