MATLAB: How to use circshift in matlab

priodic data

I have a array of indeces, so they must be positive, but some of them are negative, for instance for a array of m elements, I want to say if i=-1 put i=M-1, and if i=-2 put it M-2, how can I use circshift?

Best Answer

What you're trying to do does not seem to require CIRCSHIFT at all, but merely

 mod(i,M)

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MATLAB: Fill an matrix from another matrix

W = [M(:,[34]), M(:,1)*M(:,4)-M(:,2)*M(:,3)];

MATLAB: Using mod function for checking integers

Why not play with mod? See what it does? Lets see what we can do.

K = 1:10;

Now, pick some number that we want to use to test for divisibility.

p = 3;

So, which elements of K will P divide exactly? We would expect 3, 6, and 9 for this vector of integers K and divisor P. So if you understand how mod works, what does this tell you?

mod(K,p)
ans =
     1     2     0     1     2     0     1     2     0     1
find(mod(K,p) == 0)
ans =
     3     6     9

So when mod(K,p) is zero, that tells us that p divides K, or the corresponding element thereof for vector K.

Similarly, does 17 divide 34?

mod(34,17)
ans =
     0

Yes, it does. But not 35.

mod(35,17)
ans =
     1

As far as your assignment goes, you need to spend some time working it out. But this should get you started.

Best Answer

Related Solutions

MATLAB: Fill an matrix from another matrix

MATLAB: Using mod function for checking integers

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