Linear Interpolation and Cubic Spline Interpolation

Well I'm stuck on this problem which says: Using the data Volume = 1:6 Pressure = [2494, 1247, 831, 623, 499, 416] and linear interpolation to create an expanded volume-pressure table with volume measurements every 0.2m^3. Plot the calculated values on the same graph with the measured data. Show the measured data with circles and no line and the calculated values with a solid line. Repeat using cubic spline interpolation. Any help or tips would be greatly appreciated!!!

Answer 1

[the cyclist]

My tip is to carefully read

 >> doc interp1

[Michael]

I'm just confused as to what is considered the measured data in the problem

[Jan]

The Pressure values are the measurements. If you are in doubt, you can try all (both) possibilities and look, what's comming out.

[the cyclist]

To tie things to the documentation a bit: "x" and "Y" are your Volume and Pressure data, respectively. "xi" are volume points (every 0.2 m^3) where you want to obtain interpolated pressure values (which will be the "yi" output).