Create a variable for each raw in a matrix

Question

Ali Noori 2017-6-2

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/342937-create-a-variable-for-each-raw-in-a-matrix

编辑： per isakson 2017-6-3

Dear all, Can you please help me to make variable for each raw in the following matrix?

%------------------------------------------------------------------
%clear all
bb= [487 498 225 225;77 480 241 241;79 94 246 246;475 98 249 249]
%cc=size(bb,1);
%
for k=1:size(bb,1)
    v=bb(k,:)
end
%----------------------------------------

I need

v1= first raw
v2= second raw 
v3= Third raw
v4= fourth raw

best regards

8 个评论
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Stephen23 2017-6-2

Do not do this. Although beginners sometimes imagine that magically creating variable names will solve all of their problems, in reality it just makes code buggy, slow, hard to debug, and hard to read. You might like to consider that the MATLAB documentation specifically advises against what you are trying to do: "A frequent use of the eval function is to create sets of variables such as A1, A2, ..., An, but this approach does not use the array processing power of MATLAB and is not recommended."

source: https://www.mathworks.com/help/matlab/matlab_prog/string-evaluation.html

"Any alternative suggestions?"

Yes, use indexing. Indexing is simple, fast, efficient, neat, easy to read, makes debugging easy,...

You might also like to read what experienced MATLAB users say about this idea:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

https://www.mathworks.com/matlabcentral/answers/57445-faq-how-can-i-create-variables-a1-a2-a10-in-a-loop

https://www.mathworks.com/matlabcentral/answers/56124-eval-is-evil-using-variables-created-dynamically-info-retrieval

etc, etc

per isakson 2017-6-3

编辑：per isakson 2017-6-3

"I can't, for example, if I used bb(5,:) (the fifth row) ..." &nbsp is not a convincing answer. &nbsp If the size of the matrix isn't fixed you will always need to make checks. Example: you cannot assume that the variable, v5, exists; referencing v5 will sometimes throw an error.

Please read The XY Problem and try to explain your problem, X, to us. Everybody here seem to be convinced that creating &nbsp v1, ..., v5, &nbspsolving problem Y, will not truly help you.

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