interp

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

Result

The interpolated values yp (same type as xp).

See also

rpolyreg, qinterp, map2map

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