Matlab is Fast for Matrix Computations

[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],In most cases, you don’t need them at all if you do things right!

[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],>> X=[1,3,5,7,9]; >> X=[1;3;5;7;9]; >> X=[1,3,5,7,9]’; >> X=zeros(2); X=[0,0;0,0]; >> X=ones(2); X=[1,1;1,1]; >> X=eye(2); X=[1,0;0,1];

>> X=1:5; % X=[1 2 3 4 5] Comment sign >> X=0:0.3:1; % X=[0 0.3 0.6 0.9] >> X=ones(2) >> X(:) ans = 1 1 1 1

[object Object],[object Object],[object Object],>> A=ones(2); A^2 ans = 2 2 2 2 >> A=ones(2); A.^2 ans = 1 1 1 1

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

>> x=rand(1,99); >> for i=1:100; y(i)=x(i)^2; end ??? Index exceeds matrix dimensions. >> for i=1:100; try y(i)=x(i)^2; catch i end end i = 100

[object Object],>> axis off ,[object Object],[object Object],>> axis([xstart xend ystart yend]); Click axis >> set(gca,’fontsize’,fontsize);0

[object Object],[object Object],[object Object],[object Object],[object Object]

Matlab is Fast for Matrix Computations

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