Programmer Guide/Command Reference/EVAL/interp: Difference between revisions

Revision as of 15:22, 28 October 2025

Usage 1

interp(x, n, type {, mv})

Create an interpolated copy of the vector x with length n.

x: vector to be interpolated, x[i] = f(i)
n: length of the interpolated output vector; the interpolated vector can be shorter or longer than the original
type: the type of interpolation to perform; type=0: linear interpolation; type=1: cubic spline interpolation
mv: the value to use for missing values. If mv is given, then interpolation is stopped when x[i] = mv. This means that the sections without missing values are individually interpolated. If mv is not supplied, the whole vector x is interpolated.; note: The missing value handling is implemented only for linear interpolation (type=0)

Result

The interpolated vector y with length n.

Usage 2

interp(x, y, xp {, type=1})

Get interpolated values of function y=f(x) at the position(s) xp.

x: x value vector
y: y value vector, y[i] = f(x[i])
xp: position(s) for interpolation (number, vector or matrix)
type: the type of interpolation to perform; type=0: linear interpolation; type=1: cubic spline interpolation

@@ Line 2: / Line 2: @@
 ;Usage 1:<code>interp(<var>x</var>, <var>n</var>, <var>type</var> {, <var>mv</var>})</code>
 :Create an interpolated copy of the vector <var>x</var> with length <var>n</var>.
-:;<var>x</var>:vector to be interpolated
+:;<var>x</var>:vector to be interpolated, x[i] = f(i)
 :;<var>n</var>:length of the interpolated output vector; the interpolated vector can be shorter or longer than the original
 :;<var>type</var>:the type of interpolation to perform