p— title: “Select points by drawing a freehand gate” author: “Wajid Jawaid” email: “[email protected]” date: “2023-08-20” output: rmarkdown::html_vignette vignette: > % % % —
gatepoints provides an easy to use function, fhs (freehand select) for gating or selecting points freehand on a plot. If using from RStudio please use X11 display for a better user experience. Take the simple plot below:
x <- data.frame(x=1:10, y=1:10, row.names = 1:10)
## If you are using RStudio do X11() first.
plot(x, pch = 16, col = "red")
library(gatepoints)
selectedPoints <- fhs(x, mark = TRUE)
To select an arbitrarily complex region run the above commands and proceed as follows:
The points can be marked as defined by the user with additional parameters passed to the points function. The names of the points as given by the rownames of the data frame x will be returned in selectedPoints. Additionally the points selected for the gate will be returned as the gate attribute.
selectedPoints
## [1] "4" "5" "7"
## attr(,"gate")
## x y
## 1 6.099191 8.274120
## 2 8.129107 7.048649
## 3 8.526881 5.859404
## 4 5.700760 6.716428
## 5 5.605314 5.953430
## 6 6.866882 3.764390
## 7 3.313575 3.344069
## 8 2.417270 5.217868