Combine different Matrix together
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I am trying to write a convertor, for converting a text file to another text file. I read three different matrix, and I want to combine them.
In the following, I put a small set of data.
The first matrix is this:
0 1
3 0
1 4
This is the second matrix:
-0
-1
-0
As you see, matrix one and two have the same number of rows. This is the third matrix:
0 1
0 2
2 1
3 0
3 2
2 0
1 4
1 6
I want to produce the following:
-0: 0 1
1: 0 2
2: 2 1
-1: 3 0
4: 3 2
5: 2 0
-0: 1 4
7: 1 6
I was wondering if you kindly help me.
Thanks
采纳的回答
Walter Roberson
2016-5-31
firstcol = cellstr( num2str( (0:size(Third,1)-1).', '%d:') );
[tf, idx] = ismember(Third, First, 'rows');
firstcol(tf) = Second(idx(tf));
Output = [firstcol, num2cell(Third)];
5 个评论
Ali
2016-5-31
Walter Roberson
2016-5-31
Your Second should be a cell array of strings, not numeric values. It is tricky to determine whether a 0 is +0 or -0, and -0 easily lose their identity. -0 does exist in MATLAB as something different than 0 but with the amount of programming you have to put in to take care of it, it is easier to use cell array of strings.
Ali
2016-5-31
Walter Roberson
2016-5-31
firstcol = (0:size(Third,1)-1).';
[tf, idx] = ismember(Third, First, 'rows');
firstcol(tf) = Second(idx(tf));
fprintf( '%3d: %3d %3d\n', [firstcol, Third].');
Ali
2016-5-31
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