The classifying apparatus comprises a summation unit forming a weighted sum, modulo of the set of values. X is an integer less than 2 power P, being the number of values in the set. A store has X locations each containing a class identification word representing are of a set of standard patterns. The address inputs of the store is connected to receive the output of the summation unit. Data is received representing respective elements of the pattern and identifying for each of a number of element groups, that one of a set of predefine groups, each with a code, which that group most closely resembles accordingly to a set criterion. The codes associated with the groups so identified form the set of values.
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