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Old   November 1, 2010, 07:11
Default help for data interpolation
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cxcxcx0505
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I have data like this.matrix x,y and z.They can be plot to get a 3D surface.But, the data is only 8X7 matrix.I need to interpolate so that these there matrix become 80X70.How can I do the interpolation?Do anyone know?
Thanks!

[matrix X] (8X7)
-2.000000 -0.253290 2.530883 4.408495 6.484675 8.603029 12.000000
-2.000000 -0.198017 2.492032 4.287214 6.286022 8.542624 12.000000
-2.000000 0.055891 2.917745 4.910930 6.760385 9.110679 12.000000
-2.000000 0.440220 3.007800 5.067369 7.184489 9.370805 12.000000
-2.000000 0.649703 3.220592 5.550846 7.136382 9.419947 12.000000
-2.000000 0.766721 2.901661 5.422805 7.490025 9.714287 12.000000
-2.000000 0.400457 2.592794 5.489784 7.235743 9.964797 12.000000
-2.000000 0.396081 2.601213 5.297624 7.349845 9.914467 12.000000

[matrix Y] (8X7)
5.000000 5.000000 5.000000 5.000000 5.000000 5.000000 5.000000
0.586906 1.572462 2.538616 3.316567 2.796196 3.542882 1.551908
0.078708 0.608548 1.065732 1.461480 1.618063 1.354950 0.427768
-0.010383 -0.054167 0.823114 1.225726 1.369016 1.061109 0.239242
0.170133 0.214137 0.785628 0.945448 0.952803 0.750114 0.462212
0.232092 0.366816 0.908057 1.144984 1.088131 1.441083 0.723935
0.368313 0.745600 1.161940 1.393370 1.675171 1.795770 1.007748
5.000000 5.000000 5.000000 5.000000 5.000000 5.000000 5.000000

[matrix Z] (8X7)
-9.000000 -9.000000 -9.000000 -9.000000 -9.000000 -9.000000 -9.000000
-10.935015 -11.084483 -9.977332 -9.563093 -9.508658 -9.492408 -9.727265
-11.472939 -11.769012 -11.404871 -10.792594 -10.297023 -10.676209 -10.705359
-13.393990 -13.516353 -13.449236 -13.169214 -12.843448 -13.128858 -13.073084
-15.330998 -15.373059 -15.417483 -15.363019 -14.924627 -15.198594 -15.017660
-17.271636 -17.272911 -17.276973 -16.968769 -16.716547 -17.123834 -16.837157
-18.582179 -18.647999 -19.032487 -18.946033 -18.573566 -18.389519 -18.275102
-20.000000 -20.000000 -20.000000 -20.000000 -20.000000 -20.000000 -20.000000
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Old   November 4, 2010, 15:20
Default Bilinear Interpolation
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Try this:
http://en.wikipedia.org/wiki/Bilinear_interpolation
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Old   November 7, 2010, 05:08
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but,in the data that I showed, z is not a function of x and y.How should I interpolate it then?Do anyone know?
Thanks.
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Old   November 10, 2010, 18:55
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I'm confused as to how each of your matrices are structured, so I can only point you to some Excel tools:
http://www.xlxtrfun.com/XlXtrFun/XlXtrFun.htm
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