Octave (2.Moving Data Around)

We could type A = [1 2; 3 4; 5 6] and size(A), then Octave returns "ans = 3 2".

In fact, size(A) returns a 1*2 matrix.

 

>> size(A,1)

ans = 3    % row of matrix A

 

>> v = [1 2 3 4];

>> length(v)

 

>> pwd    % show current path

>> ls    % show all files

 

>> load xxx.dat

>> load('xxx.dat')

 

>> who   % show all variables

>> whos    % show variables size bytes and class

>> clear featureX     % delete the featureX variable

>> save hello.mat v;

>> save hello.text v -ascii

 

>> A(2,:)    % ":" means every element along that row/column

>> A([1 3], :)

 

>> A(:)    % make matrix be a column matrix