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Diffstat (limited to 'Introduction_To_Linear_Algebra_by_Gilbert_Strang/CH2/EX2.1.1')
-rw-r--r-- | Introduction_To_Linear_Algebra_by_Gilbert_Strang/CH2/EX2.1.1/Ex2.1_1.r | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/Introduction_To_Linear_Algebra_by_Gilbert_Strang/CH2/EX2.1.1/Ex2.1_1.r b/Introduction_To_Linear_Algebra_by_Gilbert_Strang/CH2/EX2.1.1/Ex2.1_1.r new file mode 100644 index 00000000..9afb84ce --- /dev/null +++ b/Introduction_To_Linear_Algebra_by_Gilbert_Strang/CH2/EX2.1.1/Ex2.1_1.r @@ -0,0 +1,27 @@ +#Example : 1 Chapter : 2.1 Pageno : 37 +#Multiplication by rows and cols dotproduct. +multiply<-function(A,x){ + b<-c() + for(i in 1:3){ + b<-c(b,sum(A[i,]*x[,1])) + } + b<-matrix(b,ncol=1) + print(paste("Multiplying matrices by dotproduct of rows and cols")) + print(A) + print("*") + print(x) + print("=") + print(b) +} + + +I<-matrix(c(1,0,0,0,1,0,0,0,1),ncol=3,byrow=T) +x<-matrix(c(4,5,6),ncol=1) +A=matrix(c(1,1,1,0,0,0,0,0,0),ncol=3) +multiply(A,x) +A<-matrix(c(1,0,0,0,1,0,0,0,1),nrow=3,ncol=3,byrow=T) +multiply(A,x) + + + + |