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Continuous-time real-life signals are usually sampled equidistantly in time or space, i.e. uniformly. However, sometimes the sampling may be nonuniform. It may be caused by practical or physical constraints so that samples are taken whenever possible, or it may be advantageous to sample nonuniformly. For example, if the signal only occasionally contains interesting information, the sampling rate may be increased and reduced upon the situation. In spatial sampling, like in beamforming antenna arrays, the antenna elements are expensive and keeping their number to a minimum is often important. The shape of the beam may be optimized to a certain direction by optimizing the locations of the antenna elements in a nonuniform manner.
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