griddata¶
griddata creates a regular grid of arbitrarily distributed data triples.
- rmZi = griddata(rvX, rvY, rvZ, rvXi, rvYi)
- rmZi = griddata(rvX, rvY, rvZ, rvXi, rvYi, nOption)
- rmZi = griddata(rvX, rvY, rvZ, rvXi, rvYi, ssOption)
Return Value
rmZi is the interpolated z value matrix for the given rvXi and rvYi coordinates. In case of an error rmZi is an error object (see example).
Parameters
- rvX
rvX is a real vector with at least 4 elements.
- rvY
rvY is a real vector with at least 4 elements. The number of points must be identical with rvX.
- rvZ
rvZ is a real vector with at least 4 elements. The number of points must be identical with rvX.
- rvXi
rvXi is a real vector with at least one point.
- rvYi
rvYi is a real vector with at least one point.
- ssOption
See nOption.
- nOption
Is one of the following values:
ssOption
nOption
“linear”
1
Linear interpolation.
“cubic”
2
cubic spline interpolation.
“tps” oder “thin-plate-spline”
3
Thin-Plate-Spline interpolation.
“poly1” or “plane”
4
“poly2”
5
“poly3”
6
“interp1d-bilinear”
7
Example
If an error occurred, griddata returns an error object (see also error_create).
def test_griddata()
{
srand(1);
x = rand(100, 1)*15-7.5;
y = rand(100, 1)*15-7.5;
r = sqrt(x.*x + y.*y);
z = sin(r)./r;
xi = linspace(-7.5, 7.5, 40)
yi = xi;
zi = griddata(x, y, z, xi, yi, "thin-plate-spline");
if (type(zi) == "error") {
MessageBoxError(zi.message);
return FALSE;
}
plotxyz(xi, yi, zi);
return TRUE;
}
History
Version |
Description |
---|---|
5.20 |
New. |
See also
Overview Mathematic, fspline2, smooth2, XYZGetInterpolationType
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