how do i convert a given set of values into a function?

I have sampled the current waveform coming from the supply and i obtained a set of discrete values. How do i generate the function of the waveform i sampled?

Answer 1

[Azzi Abdelmalek]

Use fit function, but you will need a curve fiting toolbox. But before finding a function that represent your data, you should take a look at them and choose which function could match.

[Image Analyst]

Swathi's "Answer" moved here:

But doesn't the fit function give me only the plot of my data? I want the equation of the plotted curve. Is that possible using matlab?

Answer 2

[Image Analyst]

There are many many functions that could give you that function. For example (an extreme case) the "Lagrange interpolating polynomial."

If you want a simpler fit, try polyfit(). Since you didn't post a screenshot of your plot, we can't even begin to guess what your data looks like. Do you have any underlying theory? Like it should be a sine wave or something?

[Image Analyst]

Swathi's "Answer" moved here:

Yes! It will be a sine wave with some harmonic content in it.

[Image Analyst]

Try searching the forum: http://www.mathworks.com/matlabcentral/answers/?search_submit=answers&query=fit+sine+wave&term=fit+sine+wave