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This function load grid floor and generate the simulated floor
iso_spatial_floor(D, cov.var = "exp", nugget = 0, sill, ranges, mu = 0)
The distance matrix
the var-cov function of producing var-cov matrix. 'exp' is exponential, 'gau' is Gaussian
the nugget value of the var-cov function
the sill(variance, sigma^2) of the var-cov function
the range value of var-cov function
the mean value of the simulated spatial floor
A vector with the same length of grid floor
# NOT RUN { D = spatial_dist(expand.grid(1:5, 1:5)) iso_spatial_floor(D, sill=50, ranges=2) # }
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