Creating Unit vectors in a loop

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azarang asadi
azarang asadi 2020-2-3
回答： James Tursa 2020-2-4
Hey
I have a loop an I'm trying to create some unit vectors as follows:
e1 = [1;0;0;0;0;0;0;0]
e2 = [0;1;0;0;0;0;0;0]
e3 = [0;0;1;0;0;0;0;0]
all the way to
e7 = [0;0;0;0;0;0;0;1]
Thanks
  1 个评论
James Tursa
James Tursa 2020-2-3
1) Do you have to use a loop? Is that part of the assignment? There are easier ways to do this other than a loop.
2) You should not use e1 ... e7 as the variable names. This will create problems downstream in your code. I would suggest a cell array instead, e{1}, e{2}, ... , e{7}. This will make it easier to use indexing on these variables. E.g.,
https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

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采纳的回答

Shunichi Kusano
Shunichi Kusano 2020-2-3
Hi azarang,
The following code is an example
vecLength = 8;
I = eye(vecLength);
for i = 1:vecLength
% save the vector as a field of the struct
fieldname = ['e' num2str(i)];
unitVectors.(fieldname) = I(:,i);
end
HTH

更多回答（1 个）

James Tursa
James Tursa 2020-2-4
Since a complete answer has already been posted, I will post this one using a cell array result which will be much easier to index:
n = whatever length vectors you want
e = mat2cell(eye(n),ones(n,1),n);

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