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Vectorize operations based on column and row indicies

Vectorize this
for i = 1:100
  for j = 1:100
    r(i,j) = sqrt(i^2+j^2);
  end
end


becomes

[i,j]=meshgrid(1:100,1:100);
r = sqrt(i.^2+j.^2);
to column row vectorize index meshgrid by bradphelan on Thu Jun 09 10:41:20 +0000 2005

Reverse one column or row of a matrix

To reverse column or row c of a Matrix M
M(:,c)=flipud(M(:,c))



M(c,:)=flipud(M(c,:))
to matrix reverse column row flipud by bradphelan on Thu Jun 09 10:35:55 +0000 2005

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