MATLAB: How to relate two arrays with a reference point

arraysMATLABrelated operations on arrayszero reference in array

Given array y=[1 2 3 5 7] and x= [-2 -1 0 1 2 ] I need to generate a code that by inserting n number of zeroz between the y vector (expanding the vector)

ie: y=[1 0 0 2 0 0 3 0 0 5 0 0 7] would also expand the size of the x array by maintaining the zero as the center value x= [-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 ] so that when the plotting the x&y values would result as a shift of the y values over the x axis with 0 as a reference.

This should work for both even and odd number of lengths of the x and y arrays.

I hope i could the expalnation was clear enough!

Cheers!

Best Answer

y=[1 2 3 5 7]; x= [-2 -1 0 1 2 ]
nz = 2; % number of zeros to be inserted
y(end+nz,:) = 0;
y = y(1:end-nz)
x = (0:length(y)-1)-(nz+1)*(find(x==0)-1)

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MATLAB: How to vectorize the following code snippet

x = -1.0:0.2:1.0;
y = -2:0.25:3;
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MATLAB: How to add on to y in a for loop? Insert zeros into vector. cody question

A hint:

y = [1,2,3]

Then how do you create this output:

[1,2,3,6,7,8]

? Do you see it? You need to include the former value of y.

Another idea:

Create the vector of zeros at first, which has (n+1)*length(x) elements. Then use this as index:

1 + (0:length(x)-1)) * (n + 1)

or equivalently (find out, why this creates the same result!)

1:(n+1):length(y)

when y is the created vector of zeros.

Best Answer

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MATLAB: How to add on to y in a for loop? Insert zeros into vector. cody question

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