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+#Example 1.1,Section I. page 166
+a <- c(1,2)
+a <-t(a) #a becomes row vector
+b <-t(a) #b becomes column vector
+c <-c(3,4)
+c <-t(c)
+d <-t(c)
+a+c
+b+d
+#these corresponding vectors add to corresponding totals
+5*a
+5*b
+#correspondence respecting scalar multiplication