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Selecting all pixels except one pixel

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med-sweng
med-sweng 2013-5-23
Say that we have a 3x3 matrix. If we type x(:), this will select all the elements in the matrix, right?
How can we select all the elecments except element x(2,2)? What should we type in this case?
Thanks.
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Image Analyst
Image Analyst 2013-5-23
What are you doing? Because if you're doing something like linear filtering via convolution or morphological filtering, you would do this be proper selection of the kernel.

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Iain
Iain 2013-5-23
You need to use linear or logical indexing to do that. In this case, linear would be easier:
The indices for a 3x3 are:
[1 4 7;
2 5 8;
3 6 9];
So you can access it via x([1:(1 before the one you don't want) (1 after the one you don't want:end]), so for your example:
x([1:4 6:9]);
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Iain
Iain 2013-5-23
Logical indexing would use something more like x(x > 5), and it would select only those elements greater than 5.
Iain
Iain 2013-5-23
I should also say that x .* (x>5) also "selects" the bits of x that are greater than 5, but it keeps the shape of x.

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