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diff --git a/Introduction_To_Linear_Algebra_by_Gilbert_Strang/CH2/EX2.3.1/Ex2.3_1.r b/Introduction_To_Linear_Algebra_by_Gilbert_Strang/CH2/EX2.3.1/Ex2.3_1.r
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+# Example : 1 Chapter : 2.3 page no : 57
+#Matrix multiplication as dotproduct of row and column
+A<-matrix(c(3,4,5,6),nrow=2,ncol=2,byrow=T)
+x<-c(2,1)
+B<-A%*%x
+B
+Ax<-c()
+for(i in 1:2){
+ Ax<-c(Ax,sum(A[i,]*x))
+}
+Ax<-matrix(Ax,ncol=1)
+Ax \ No newline at end of file