The help says that splin2d generates bicubic patches, so presumably it's
not linear interpolation.
On 2017-03-25 00:24, paul.carr...@free.fr wrote:
> Hi All
>
> To go further in 2D/3D interpolation as I started in my previous emails, I
> built the example here after.
>
> As suggested, I had a look to
> - cshep2d but but seems can not be used here (dimensions issue)
> - splin2d + interp2d
>
> In the later case, Am I right to say that splin2d "cross-sections" the
> surface in order to define the "best spline" passing through the nodes (in
> the cross section obviously), then the interpolation/calculation is basically
> using this new 2D function, right ?
>
> if so this is not a linear interpolation between 2 nodes (as I expect), isn't
> it?
>
> Paul
>
> ############################################
>
> mode(0)
>
> n=10;
> x = linspace(0,300,(n+1))'; // abscissa
> t = [0 25 100]; // temperature
> z = 20*rand((n+1),3); // ordinate
> // Nota : we must have the same number of data for both x and z
>
> // plot3d
> clf()
> a=get("current_axes");
> a.x_label; x_label=a.x_label; x_label.text=" X abscissa";
> a.y_label; y_label=a.y_label; y_label.text=" Temperature T";
> a.z_label; z_label=a.z_label; z_label.text=" y ordinate";
> plot3d(x,t,z)
>
> // Nota: if I do a cross section normal to XoZ plane, I've the basic curve
> z=f(x,T)) -> seems correct
>
> // interpolation
> xp = [22 103 236]'
> tp = [5 56 85]'
>
> [Xp,Tp] = ndgrid(xp,tp)
>
> _______________________________________________
> users mailing list
> users@lists.scilab.org
> http://lists.scilab.org/mailman/listinfo/users_______________________________________________
users mailing list
users@lists.scilab.org
http://lists.scilab.org/mailman/listinfo/users
