Question

answer the following in details..

Q2. Two matrices can be multiplied in number of different ways. Below is given four different ways of multiplying two matrices: 1) Using MATLAB generate any two matrices (A1oxs and Bsx10) and compute AB using all four 2) 3) methods Which of these methods would be computationally less expensive? Can you suggest any other way of multiplying these two matrices?

Answer 1

`Hey,

Note: Brother in case of any queries, just comment in box I would be very happy to assist all your queries

clear all
clc
A=rand(10,5);
B=rand(5,10);
disp('First method');
tic;
A*B
t1=toc;
[m1,n1]=size(A);
[m2,n2]=size(B);
C=[];
tic;
for i=1:m1
for j=1:n2
C(i,j)=0;
for k=1:n1
C(i,j)=C(i,j)+A(i,k)*B(k,j);
end
end
end
t2=toc;
disp('Second method');
disp(C);
fprintf('Time elapsed by first method is %f\n',t1);
fprintf('Time elapsed by second method is %f\n',t2);

MATLAB R2018a EDITOR Search Documentation Log In Find Files Compare Print Run Section New Open Save Advance Run and Find Advance C: Users PRADEEP KALRA 、Documents MATLAB Current Folder Editor-CAUsers\PRADEEP KALRA TLABsaveee.m Name saveee.mx pradeep.m xl secantbypradeep.m Х| newtonrapsonsbypradeep.m xl matmult.m X1+ mathlab for k-linl New folder 20 - 2-toc 11sp('Second method): 23- 24- 25- 26 Command Window isp (C): a5.m A1.dat A1.mat A2.dat A3.dat fprintf('11me elapsed by by first method %f\n',t1); is %f\n',t2) 18 rintf('Time elapsed second method New to MATLAB? See resources for Getting Started 0.7594556528630861.40754839824938 1.26597657795532 0.556519104749109 0.719861870302 933 0.986800929657099 1.446076310779571 0.643160098 386800 1.363051823864355 2.196889666087479 2.76550897105132 1.012347607197682 0.586515454932604 0.903278742097748 0.438762474767783 0.287747426995223 0.865629819630932 1.644992532123247 2.095540217417584 0.738499499121039 0.717281374311656 1.365396943403269 1.495643416570651 0.538923563173186 1.060742158389904 1.97774724523427 1.865369329833880 0.691862895697561 1.129831742250889 2.099316782901008 2.563494488736768 0.921359963928925 1.077967476942037 2.194471433440436 2.505735425082873 0.918258907281334 Name Value 105 double 0x10 double Sx10 double 0x10 double 10 10 Time elapsed by tirst method 13 0.001108 Time elapsed by second method is 0.006909 10 m2 Ln 26 Col O Type here to search ENG 1:02 PM US 03/28/19

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