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I have nonlinear-differential -system for water-flow. I need to find the reciprocal -block in Simulink. I could do it with reciprocal-sqrt -block and sum -block but too complicated, there must be some easier way of doing the reciprocal. How can I take the reciprocal in Simulink?

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Use Fcn block with 1/u(1) function.

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    Use search :) The block looks like this: http://www.mathworks.se/help/simulink/slref/fcn.html2012-09-29