x=1:5
x(1)
% x=[1,3,5;3,2] nelze
x=[1,3,5;3,2,0]
sum(x)
x'
sum(x')
(sum(x'))'
transpose(x)
x
x(2,1)
size(x)
size(x,1)
size(x,2)
x(end,end)
x
x(1,:)
x=[x;x]
x=[x,x]
x(:,1)=[]
x+1
x+x
% x*x nelze
x.*x
x
x>1
x>=1
x==1
x
x~=3
x
x(:,x(1,:)>2)
x(1,:)>2
help ones
ones(1,5)
diag(2:4)
diag([2,3,4])
1:0.1:2
reshape(x,2,10)
x
reshape(x',2,10)
A=diag(1:3)
[A(:,2),A(:,1),A(:,3)]
[A,ones(3,1)]
B(3,4)=3
B(:,2)=ones(3,1)
x=randi(10,1,3)
perms(x)
perms(1:3)
A, [perms(A(:,1)),perms(A(:,2)),perms(A(:,3))]
(reshape(ans',3,18))'
help sort
B
B=randi(10,3,4)
[Y,ind]=sort(B)
[Y,ind]=sort(B,2)
[Y,ind]=sort(B,2,'descend')
B
[Y,ind]=sort(B,1,'descend')
B=randi(10,3,4)
[Y,ind]=sort(B,1,'descend')
B(ind(:,1),:)
B
x=1:5
[x;x+1;x+2]
x=1:5; for k=1:5, x=[x;x(end,:)+1],end
x=1:5
x'
x(ones(1,5),:)
(x(ones(1,5),:))'
(x(ones(1,5),:))'+x(ones(1,5),:)
(x(ones(1,5),:))'+x(ones(1,5),:)-1