matrix manipulation

eri
2011 12 21
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how to remove row(s) or column(s) of a matrix and save the new matrix with different name? and is there any limit on how big of matrix that can be processed by matlab?

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Chandra Kurniawan
Chandra Kurniawan 2011-12-21

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Just use [] for any column or row that you want to remove.
Eq :
A = round(10*rand(10));
B = A;
B(3, :) = []

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eri
eri 2011-12-21
oh i see, so the idea is make a copy of the matrix and remove the row/column. but how to remove multiple rows/columns?
and is there any size limit of matrix that can be processed by matlab?
Chandra Kurniawan
Chandra Kurniawan 2011-12-21
Just add a row list. List of row or column that you want to remove.
A = round(10*rand(10))
B = A;
Remlist = [1 3 5 7];
for x = 1 : length(Remlist)
B(x, :) = [];
end
B
For limit, I think Matlab doesn't limit the size for any matrix.
IThe capability depends on your memory [RAM]
eri
eri 2011-12-21
thank you
Friedrich
Friedrich 2011-12-21
MATLAB has a maximum size of matrices. It is limited by the amount of elements in a matrix not by the dimension. The computer command gives you that limit:
[str,maxsize] = computer returns the integer maxsize, the maximum number of elements allowed in an array with this version of MATLAB
And of course the it depends on the memory and bitness of your system:
http://www.mathworks.com/support/tech-notes/1100/1107.html#1

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