modelica-3rdparty / approxspline Goto Github PK

Hi,

I would like to use ApproxSpline library to develop a media package based on spline interpolation with 2d thermodynamic tables, typically for example h=f(p,T).

"Surf2d.eval" function works fine using rectangular table but i have an error "parder returns err: ierr=10 " with "Surf2d.derivative" function.

h =ApproxSpline.Surf2d.eval(
spline_h_pT,
x=p_var.y,
y=T_var.y); -->OK

//Cp calculation dh/dT
Cp =ApproxSpline.Surf2d.derivative(
spline_h_pT,
x=p_var.y,
y=T_var.y,
ddx=0,
ddy=1); -->error "parder returns err: ierr=10 "

I checked the mdc_dierck.c and the parder.f but without succes...

Any idea?

Thanks in advance,

François

No question here, just a link to SO:
https://stackoverflow.com/questions/19058812/interpolation-in-dymola-modelica