creating matrix out of another matrix

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mehra
mehra 2019-9-9
评论： mehra 2019-9-9
I have a results matrix of size 104*14. I want to create a matrix of size 8*13 in which u(1,1)=results((1:13),4) and....I tried to write the matrix like:
u_mean_Uund=[results(1:13),4; results(14:26),4;results(27:39),4;results(40:52),4;results(53:65),4;...
results(66:78),4;results(79:91),4;results(92:104),4]
But this shows the first column of the results matrix, I actually want a 8*13 matrix in which the arrays are all from column 4.
  2 个评论
Stephen23
Stephen23 2019-9-9
Your description contradicts itself: "I want to create a matrix of size 8*13..." but also "I actually want a 8*14 matrix...": so do you want an 8x13 or an 8x14 matrix?

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mehra
mehra 2019-9-9
I solved it using following for loop:
for nn=1:8
u_depth(nn,:)=transpose(results((13*(nn)-12):13*(nn),4));
end
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Bruno Luong
Bruno Luong 2019-9-9
编辑：Bruno Luong 2019-9-9
"I explained why the older comment doesn't give the answer"
And Stephen has explained to you the opposite and I tested it
results=rand(104,14);
% your solution
for nn=1:8
u_depth(nn,:)=transpose(results((13*(nn)-12):13*(nn),4));
end
% Stephen's solution
out = reshape(results(:,4),13,8).';
isequal(u_depth,out)
It returns 1, meaning both gives the same ANSWER on a random input. So Stephen is right and you are wrong.
You just are not rigouruous person and lack patient or perhaps a bit of courtesy to discuss with Stephen.
mehra
mehra 2019-9-9
Well... I dont know niether you nor Stephen and I dont want to argue with anyone...i was rushing to get the answer as soon as possible, so I also worked on that... Anyway i think you cant judge people like this...and again I thanks everyone for their answers and their help.

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更多回答（1 个）

Stephen23
Stephen23 2019-9-9
编辑：Stephen23 2019-9-9
out = reshape(results(:,4),13,8).';
out(:,14) = 4; % if you want an 8x14 matrix
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Stephen23
Stephen23 2019-9-9
"...but still you have not seen my problem..."
If I failed to understand your problem as you claim, how did I write code that returns exactly the same result as your loop (which you posted four hours later)?
>> results = rand(104,14);
>> for nn=1:8 % your loop
u_depth(nn,:)=transpose(results((13*(nn)-12):13*(nn),4));
end
>> out = reshape(results(:,4),13,8).'; % my simpler reshape
>> isequal(u_depth,out) % The same outputs!
ans =
1
That would require me to make two mistakes:
  1. to misunderstand your question (which is certainly possible),
  2. then to write strangely buggy MATLAB code that doesn't do what I want it to do (based on my incorrect understanding of your problem), but that coincidentally ends up doing exactly the same thing as your loop....
With such luck, I should go an buy a lotto ticket!
mehra
mehra 2019-9-9
Anyway i am happy that my solution also works

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