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A network of passive electrical resistors is connected in a closed loop with a digital computer. This network functions as a parallel-operating subroutine to greatly accelerate the digital computer solution of certain classes of numerical problems. Computer systems employing the analog subroutine concept are "digital-computer-oriented" hybrid computers. Problems are programmed for conventional digital computation, and the digital computer flow chart is analyzed to determine if some particularly time-consuming blocks could be better handled by analog rather than digital techniques. A simple special-purpose analog unit is then constructed for this computational task.
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Walter J. Karplus (1971) studied this question.
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