How MATLAB move between discrete measurements

Hi there

when we have discrete measurements of speed or temperature, based on what MATLAB draw a scatter curve between these points ?

Thanks in advance.

Answer 1

[Image Analyst]

See my spline demo, attached, which will produce the plot below:

The red are the original data points, and the blue are the spline interpolated points. You can take the markers off the blue curve, and not plot the red curve, and plot the original data with big blue dots and it will look just like your curve.

[ameen]

Thank you for your kind reply and the very useful code

[Image Analyst]

You're welcome. You can thank people also by Voting for their answer or Accepting their answer.

Answer 2

[dpb]

By plot, scatter, etc., simply straight line interpolation between points.

Use cftool or one of the specific fitting methods to fit a functional form or could use interp1 and an interpolating option other than linear to do some other form.

[ameen]

Thank you for your answer.

I have some measurements versus time and i plot it as a curve but my supervisor ask me to explain how this curve move between discrete measurements ??

[dpb]

Well, can't see your monitor from here...what did you do to create the plot?

[ameen]

:)

I am talking about any plot or curve. How MATLAB move between data points we have ? Polynomials ? or Algorithms ?

I found something about Catmull-Rom curves. Here is an example of plots i made.

[dpb]

Well, clearly it was something other than straight line -- but you still didn't say what specific function you used to create the plot. There are many possible choices; which you did, specifically, I have no idea unless you show/tell us what you used as I said in the very first response.

That looks like it probably was a smoothing spline, given the shape of the curve, however.

Again, how, specifically, did you create the plot in Matlab?

[ameen]

Yes this is a smoothing spline