There are also efficient approximation algorithms for approximating on graphs of bounded degree. But the system is piecewise linear, only approximating the exponential curve loosely. Another technique was approximating the perspective with a faster calculation, such as a polynomial. Several sets of orthogonal functions have become standard bases for approximating functions. Subsampling is an alternative method for approximating the sampling distribution of an estimator. The finite difference method (FDM) is an alternative way of approximating solutions of PDEs. In addition to numerically approximating this integral(e.g. Standard approaches such as approximating, locally linearizing and iterative solvers all apply. These microfacets have normals that are distributed about the normal of the approximating smooth surface. Active SLAM is generally performed by approximating the entropy of the map under hypothetical actions. This problem will result in samples not approximating correctly to the posterior density. Related sequences contain divisions approximating other just intervals. Higher-order methods for approximating the derivative, as well as methods for higher derivatives, exist. Collision detection was also sped up by approximating the environment with spheres rather than boxes. AIC is appropriate for finding the best approximating model, under certain assumptions.