Need a smoother curve .......

[aimtiaz]

I'm attaching a prime 3.1 file . In which i tried to interpolate two sets of data to make a smooth curve like Excel plotting . But the curve is not so smooth , like what I'm expecting .

[ValeryOchkov]

See please the attach.

But you need not a spine interpolation but a fittings.

[Werner_E]

Unfortunately I can't read P3.1 files (just 3.0).

So here is a file using spline interpolation and a few regressions.

Valey is showing a logistic model but with different data compared with the Excel sheet ?

[VladimirN]

Werner,

Please find a PDF version of this worksheet in attachment.

[Werner_E]

Thanks.

So I see what the problem is:

This second abscissa value has to be either an undefined variable (if you dispense with the units) or a range variable. I had shown how to do it in my first reply - here is the version using units

[VladimirN]

When you create the plot you just need to increase the step for the variable argument of function.