Matrix Element Transfer from one matrix to another
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I have a matrix of 10X10. I want to select elements of this matrix and put them in an N X 2 Matrix. As example, if one of the selected elements of the 10X10 matrix is at 10, 12 I want this 10,12 to be transferred to the N X 2 matrix. Hence, basically the question I am asking is how to transfer position i.e row,col of a matrix from one to the other.
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Answers (2)
James Tursa
on 6 Oct 2016
I am not quite clear what you are asking. Is it something like this?
>> A = reshape(1:100,10,10) % <-- test data
A =
1 11 21 31 41 51 61 71 81 91
2 12 22 32 42 52 62 72 82 92
3 13 23 33 43 53 63 73 83 93
4 14 24 34 44 54 64 74 84 94
5 15 25 35 45 55 65 75 85 95
6 16 26 36 46 56 66 76 86 96
7 17 27 37 47 57 67 77 87 97
8 18 28 38 48 58 68 78 88 98
9 19 29 39 49 59 69 79 89 99
10 20 30 40 50 60 70 80 90 100
>> [row,col] = find(A==47) % <-- pick off row & column of location of 47
row =
7
col =
5
>> B(1,1:2) = [row,col] % Stuff the row & col into the 1st row of B
B =
7 5
>> [row,col] = find(A==59) % <-- pick off row & column of location of 59
row =
9
col =
6
>> B(2,1:2) = [row,col] % Stuff the row & col into the 2nd row of B
B =
7 5
9 6
3 Comments
James Tursa
on 6 Oct 2016
Does this do what you want?
>> A = reshape(randperm(25),5,5)
A =
17 2 24 14 8
1 23 16 10 4
11 12 20 18 15
6 9 22 13 5
25 3 21 19 7
>> [row,col] = find(A<10); % <-- find where A is less than 10
>> result = [row col]
result =
2 1
4 1
1 2
4 2
5 2
1 5
2 5
4 5
5 5
Star Strider
on 6 Oct 2016
If I understand what you want, the find function will do exactly that.
Example:
M = randi(9, 10); % Create Matrix
[row,col] = find(M == 3); % Return Rows & Cols Of All ‘3’ Values
6 Comments
Star Strider
on 6 Oct 2016
Dijkstra's algorithm may be what you’re looking for. I’ve no experience with it, nor coding any optimal-path problems.
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