MATLAB: Are first two elements of the computed r vector are 0

MATLABmatrixvectors

Hi, I'm learning Matlab along with linear algebra and I ran the code below.

for n=3:10
  r(n) = rank(magic(n));
end

And my r resulted in:

r = 0 0 3 3 5 5 7 3 9 7

Please why are the first two elements 0?

Best Answer

Your for loop runs from 3 to 10, so it fills in the 3rd through 10th elements.

The first two are automatically set to 0 when you fill in the 3rd, because MATLAB has to fill in something to make that initial 3-element vector when you specified only the 3rd element. The default is to fill in 0.

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MATLAB: Shifting Elements of a Vector to the right while deleting the last number

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p = 3 % index for first element to shift
z = 1 % number of spots to shift
n = numel(A)
A = [A(1:p-1) zeros(1,min(n-p+1,z)) A(p:n-z)]
A =
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p =
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n =
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Best wishes

Torsten.

Best Answer

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MATLAB: Shifting Elements of a Vector to the right while deleting the last number

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