Question concerning usage of cscvn and fnplt

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Roy Veldhuizen
Roy Veldhuizen 2013-12-23
编辑： Roy Veldhuizen 2014-1-3
Hello everybody,
I'm trying to fit a spline to a set of data. I use a loop to vary the interval at which i'm using data, this is denoted by the 1:i:end. My data looks like this:
0 0 -0.2000
9.8500 -0.0100 -1.9500
19.7100 -0.0100 -3.6100
I am using the following command to generate a spline
Spline(i) = struct(cscvn([Coord(1,1:i:end); Coord(2,1:i:end);Coord(3,1:i:end)]));
In which the first columns contains x values, the second y, and the third z. If I then try to recreate the data which I tried to fit I use
Points(i).a = fnplt(Spline(i));
I used these two commands right after each other, so without any manipulation. However, I found that the data, as stored in Points(i).a contains some multiples, so repeating pairs of x,y,z data. I've found out that every two points, it shows a repeating entry, an example is:
0 0 -0.2000
4.9039 -0.0061 -1.0789
9.8098 -0.0100 -1.9430
9.8500 -0.0100 -1.9500
9.8500 -0.0100 -1.9500
14.7193 -0.0105 -2.7813
19.6322 -0.0100 -3.5972
19.7100 -0.0100 -3.6100
19.7100 -0.0100 -3.6100
I notice that all the values that are given in input data are multiplied, and the 'interpolated' values only come up once. Is this a result of the piecewise nature of the spline fitting, or is there some cause in the way I'm using the cscvn?
Thanks in advance for your time!
Roy

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