[Scilab-users] LInear interpolation between 2 curves

[Antoine Monmayrant]

On 17/09/2012 09:53, Carrico, Paul wrote:
> Dear all,
> Is it possible to make a linear interpolation between 2 curves ? note 
> the abscissa are not necessary exactly the same  ...
> In particular terms, I've a curve one at temperature X and another one 
> at température Y and I would like to have (and to plot) temperature at 
> temperature Z in-between X-Y ... (see attachment)
> I had a look in interp, interp1 and interpln but nothing sound useful 
> for me ... Am I wrong ?
> Thanks for any advice
> Paul
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You should have a look at ndgrid and cshep2d.
Here is a bit a script we use to interpolate scattered data on a grid:

[xy,k]=unique([x,y],1);
x=x(k);
y=y(k);
z=z(k);

//Interpolation bicubique
tl_coef = cshep2d([x y z]);
// evaluation on a grid
m = 50;
X = linspace(min(x),max(x),m);
Y = linspace(min(y),max(y),m);
[xx,yy] = ndgrid(X,Y);
// interpolation bicubique pour intuiter les valeurs
Z = eval_cshep2d(xx,yy, tl_coef);


Cheers,

Antoine

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  Antoine Monmayrant LAAS - CNRS
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