refcurve (Statistics Toolbox)

Add a polynomial curve to the current plot.

Syntax

h = refcurve(p)

Description

refcurve adds a graph of the polynomial, p, to the current axes. The function for a polynomial of degree n is:

y = p₁xⁿ + p₂x^(n-1) + ... + p_nx + p_n+1

Note that p₁ goes with the highest order term.

h = refcurve(p) returns the handle to the curve.

Example

Plot data for the height of a rocket against time, and add a reference curve showing the theoretical height (assuming no air friction). The initial velocity of the rocket is 100 m/sec.

h = [85 162 230 289 339 381 413 437 452 458 456 440 400 356];
plot(h,'+')
refcurve([-4.9 100 0])