how generating evenly spaced vectors with overlap?

Hi all,

I need to generate evenly spaced vectors with overlap. How can I do it? Here an example:

Input: [0 5 10 15 20];

Output: [0 5, 4 10,9,15,20];

I know they are not even, but also like that is fine.

Thanks cheers

[Sara]

Can you provide an example? What do you mean "with overlap"? How about something like this:

   x = 1:1:10

or

x = linspace(1,10,10);

[the cyclist]

I don't understand the rule for going from input to output.

Also, numeric matrices in MATLAB cannot be "uneven". Do you want to put a placeholder of "NaN" (not-a-number), or use some other class of variable, such as a cell array?

[pietro]

By istance I want to create 4 slices of a 20 seconds long time history with an overlap of 0%. So I do:

SeparationPoints=linspace(0,20,5);

and I get: [0 5 10 15 20] and my signal slices are: [0 5; 5 10;10 15;15 20];

with a 5% overlap, that it will be: 20*5/100=1 so my signal slices will be something like [0 5; 4 10 ;9 15; 14 20]; The 5% of overlapping is the difference between the end of the slice and the beginning of the following one.

Is it clearer now?

Answer 1

[Joseph Cheng]

Starting with the linspace above that people suggested you can get the over lap you by doing this:

input = [0 5 10 15 20];
overlap = 5; % percent
overlap = input(end)*(overlap/100);
output = [input(1:end-1)'-overlap input(2:end)']
output(output<0) = 0;

disp(output)

[pietro]

Thanks!