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Padded input for ScatteredInterpolant

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Yi-xiao Liu
Yi-xiao Liu 2021 年 3 月 2 日
編集済み: Yi-xiao Liu 2021 年 3 月 3 日
I am tring to reconstruct a surface in cylinderical coordinate space from set of points. theta,R,z represents azimuthal, radial, axial coordinates, respectively, of measured points. And 0<=theta<360, 0<=z<=200.
Paddedtheta=[theta-360;theta;theta+360];
PaddedR=[R;R;R];
Paddedz=[z;z;z];
RInterpolant=scatteredInterpolant(Paddedtheta,Paddedz,PaddedR,'linear');
However, inquiry RInterpolant at theta=0 and theta=360 does not return identical results:
RInterpolant(repmat(0,[1,201]),0:200)-RInterpolant(repmat(360,[1,201]),0:200)
ans =
1.0e-14 *
Columns 1 through 12
0 0 -0.0888 0 0 0 0 0 0 0 0 0
Columns 13 through 24
0 0 -0.0888 0 0 0 0 0 0 0 0 0
Columns 25 through 36
0 0 0 0 0 0 0 0 0.0888 0 0 0
Columns 37 through 48
0 0 0 0 0 0 0 0 0 0 0 0
Columns 49 through 60
0 0 0 0 0 0.0888 0 0 0 0 0 0
Columns 61 through 72
0 0 0 0 0 0 0 0 0 0 0 0
Columns 73 through 84
0 0 0 0 0 0 0 0 0 0 -0.0888 0
Columns 85 through 96
0 0 0 0 0.0888 0 0 0 0 0 0 0
Columns 97 through 108
0 0 0 0 0 0 0 0 0 0 0 0
Columns 109 through 120
0 0 0.0888 0 0 0 0 0 0 0 -0.0888 0
Columns 121 through 132
0 0 0 0 0 0 0 0 0 0 0 0
Columns 133 through 144
0 0 0 0 0 0 0 0 0 0 0 0
Columns 145 through 156
0 0 0 0 0 0 0 0 0 0 0 0
Columns 157 through 168
0 0 0 0.1776 0 0 0 0 -0.0888 0 0 0
Columns 169 through 180
0 0 0 0 0 0 0 0 0 0 0 0
Columns 181 through 192
0 0 0 0 0 0 0 0 0 0 0 0
Columns 193 through 201
0 0 0 0 0 0 0 0 0
Could anyone tell me why?
  2 件のコメント
darova
darova 2021 年 3 月 3 日
THe error is very small
ans =
1.0e-14 *
Columns 1 through 12
Yi-xiao Liu
Yi-xiao Liu 2021 年 3 月 3 日
I understand the error is small. I am just curious the cause as I was not expecting any

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