interp3d 3d spline evaluation function [fp[,dfpdx,dfpdy,dfpdz]]=interp3d(xp,yp,zp,tl,out_mode) xp, yp, zp real vectors or matrices of same size tl tlist of type "splin3d", defining a 3d tensor spline (called s in the following) out_mode (optional) string defining the evaluation of s outside the grid ([xmin,xmax]x[ymin,ymax]x[zmin,zmax]) fp vector or matrix of same format than xp, yp and zp, elementwise evaluation of s on these points. dfpdx, dfpdy, dfpdz vectors (or matrices) of same format than xp, yp and zp, elementwise evaluation of the first derivatives of s on these points. Given a tlist tl defining a 3d spline function (see splin3d) this function evaluates s (and ds/dx, ds/dy, ds/dz if needed) at (xp(i),yp(i),zp(i)) : The out_mode parameter defines the evaluation rule for extrapolation, i.e. for (xp(i),yp(i),zp(i)) not in [xmin,xmax]x[ymin,ymax]x[zmin,zmax] : "by_zero" an extrapolation by zero is done "by_nan" extrapolation by Nan "C0" the extrapolation is defined as follows : "periodic" s is extended by periodicity. splin3d bsplin3val 5.4.0 previously, imaginary part of input arguments were implicitly ignored.