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STORAGE OF SELECTIVE VALUES OF SOME CELLS INTO A SINGLE MATRIX FROM TWO DIFFERENT MATRICES. Whats wrong with this?

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Sandip Ghatge
Sandip Ghatge 2020-5-15
评论： Sandip Ghatge 2020-5-16
%Matrices Given
A = [1 2 3 4 5;6 7 8 9 10;1 4 5 6 7;8 9 44 5 6;5 5 16 25 44];
B = [3 4 16 44 66;16 25 33 44 66;20 31 45 66 80;11 22 33 44 55;7 10 25 44 60];
%Storage of a Matrix
C = [A(:,1)<4 & A(:,1)>=2;B(:,1)>4 & B(:,1)<40;A(:,2)<10 & A(:,2)>7;B(:,2)>=25 & B(:,2)<50];
What i expected was?
C =
2
3
16
8
9
25
33
44
But all i get is zeros and ones, Why? is it not the right way?

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采纳的回答

William Alberg
William Alberg 2020-5-15
编辑：William Alberg 2020-5-15
Okay, you have made 2 errors:
  1. A(:,1) returns: [1;6;1;8;5]. I think you want it to return [1, 2, 3, 4, 5], which is A(1,:).
  2. "A(:,1)<4 & A(:,1)>=2" gives an index, you want the corresponding values, which is: "A(A(:,1)<4 & A(:,1)>=2,1)" (Note that error 1 isn't fixed here)
You will need to understand this, otherwise you will make the same error again.
Since this appears to be for a school assignment, i will only correct the first section, you will need to the others yourself
C = [A(1,A(1,:) < 4 & A(1,:) >= 2)];
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William Alberg
William Alberg 2020-5-16
I am a bit confused about what you are trying to achieve in the first example. And i also dont understand why the numbers have changed. i think you want it to be:
C = [A(A(:,1) < 6 & A(:,1) > 1,1)]
However, that does not give the result you desired in your first post.
Your second example has a mistake in the last 5 characters. You have "),1];". It needs to be ",1)];"
Again, that does not give the result you originally specified.
The code below is your original solution, with my first answer inserted. ( I changed the layout a bit)
C = [...
A(1,A(1,:) < 4 & A(1,:) >= 2)';...
B(:,1)>4 & B(:,1)<40;... % needs change
A(:,2)<10 & A(:,2)>7;... % needs change
B(:,2)>=25 & B(:,2)<50]; % needs change
Sandip Ghatge
Sandip Ghatge 2020-5-16
Sorry, for confusing you.
I have got my desired results, and have written such codes for both columns of A & B.
Thank you very much.

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