Calculating frequency of a sine wave with varying frequency
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I have a sine wave with a varying frequency. I would like to plot the frequency over time.
My approach was to find all values >0 and set them to 1, and all other values to 0.
Now I have a vector, for example:
A = [1 1 1 1 0 0 1 1 1 0 0 0 0 1 0 0]
If I could sum all groups of ones and put the result in another vector I could calculate the frequency because I know how many sample points I have per time unit.
In short, what I would like to do is to sum all groups of ones separately and put them in a vector in the correct order, as the groups appear.
So the result for vector A above would be:
B = [4 3 1]
i.e. the sum of the first group of ones is 4, there are four ones. The second group has 3, and the last group has 1.
Thank you for you time.