Add pdf/cdf of ERV

ch04.r

@@ -1,12 +1,23 @@
 # Chapter 4.3 (Cumulative Distribution Function)
 
-## CDF of a Gaussian mixture
+## 4.10 CDF of a Uniform Random Variable
 
 # R code to generate the PDF and CDF
-x = seq(-5, 10, (15)/1500)
+x = seq(-5, 10, (5+10)/1500)
 f = dunif(x, -3, 4)
 F = punif(x, -3, 4)
 plot(x, f, type="n")
 lines(x, f, lwd=5)
 plot(x, F, type="n")
 lines(x, F, lwd=5)
+
+## 4.11 CDF of an exponential random variable
+
+# R code to generate the PDF and CDF
+x = seq(-5, 10, (5+10)/1500)
+f = dexp(x, 1/2)
+F = pexp(x, 1/2)
+plot(x, f, type="n")
+lines(x, f, lwd=5)
+plot(x, F, type="n")
+lines(x, F, lwd=5)