BP learning algorithm Mexican hat function approximation BP learning algorithm using Matlab achieve in the Windows environment to achieve the desired mean square error in under minimal expression of Mexican hat function correctly. Experimental purposes: 1. to understand the structure of BP neural network model, a preliminary understanding of the use BP network.               2. Learning BP learning algorithm, master of error back propagation thoughts of constructing the network.               3. BP learning algorithm can correctly use the expression of the Mexican hat function.

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