bilinearGrad.RdGradient for bilinear interpolation
bilinearGrad(loc, cov_list)
| loc | Point at which the gradient should be evaluated (2d vector) |
|---|---|
| cov_list | List of J (number of covariates) "raster like" elements. A raster like element is a 3 elements list with named elements 1) "x" a vector of increasing x locations (at which the covariate is sampled) 2) "y" a vector of increasing y locations (at which the covariate is sampled) 3) "z" a size(x)*size(y) matrix giving covariate values at location (x, y) |
Gradient of all covariates at the given location