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+#Example 1.4,chapter 4,Section III. Laplace's Formula,page 354
+#package used matlib v0.9.1 and pracma
+#Github reposiory of matlib :https://github.com/friendly/matlib
+
+#installation and loading library
+#install.packages("matlib")
+library("matlib")
+
+#program
+T <- matrix(c(1,4,7,2,5,8,3,6,9),ncol = 3)
+T12 <- cofactor(T,1,2)
+T22 <- cofactor(T,2,2)
+T12
+T22