Matrix manipulation is the power of Matlab. That’s why Matlab stands for Matrix Laboratory (not Mathematics laboratory). This software easily calculates many Matrix operation that difficult for other languages (c++, java, etc.). In addition, Matlab not only operates through its function but also uses looping tools similar to other language, i.e. ‘for-next’, ‘while-do’, etc. One of my best friends studying in Australia discussed about how to manipulate Matrix efficiently weeks ago. For example we have a matrix:
And we have another matrix, B=[1 2 3 4 5;6 7 8 9 10;11 12 13 14 15];
The question is how to create matrix C which contains column elements in B for every even number of column in A. Of course we can create manually based on the B value, but the problem is when the number of Matrix A and B are thousands, e.g. coordinates. In Matlab we are allowed to use “for-next” instruction to manipulate a matrix.
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>> C=A;
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for i=1:10
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[rows cols]=size(B);
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if cols>=i
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C(:,2*i)=B(:,i);
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end
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end
The script will give the result:
Use function “size” to know maximum column of A and B. Of course you can try to create the other algorithms for this purpose. Tq
Rahmadya Trias Handayanto 