Constant bandwidth in kernel density estimate (R)

I'm having some difficulties with R right now.

What I have:

• a vector with minimal values for each triangular kernel
• a vector with maximal values
• a vector with the "middle" point (where the pick of each triangular should be)

What I need:

• a density estimate (triangular kernels ofc)开发者_Go百科

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See if you can build on this example of varying bandwidth specifications to the base density function with a triagular kernel:

data("faithful", package = "datasets") 
x <- faithful$waiting 
opar <- par(mfcol= c(2,2))
for (bw in c(3,6,12,18) ) {
  hist(x, xlab = "Waiting interval", ylab = "Eruption Freq", 
  probability = TRUE, main = "Density plot: Triangular kernel", 
  border = "gray", sub= bquote("Bandwidth = "*.(bw) ) ) 
  lines(density(x, width = bw, window = "triangular"), lty=3, col="red")
  }
par(opar)