simulink_sfunctions - Simulink SFunctions ChE 446 Simulink...

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Simulink: S-Functions ChE 446
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Simulink M-file S-Functions o Primary purpose Simulating  nonlinear  dynamics with MATLAB o How they work Example M-file S-function script (Simulink/User-Defined  Functions/S-function/examples/M-files/Level-1 M-files)  explains the basics Each iteration, the S-function performs calculations based  on the value of a flag (initialize, find derivatives, update  actual values, etc.); it returns the answer, then changes the  flag for the next iteration. The code is reasonably well-documented as to what to  enter where; we’ll help later.
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General Structure o Switch statements o switch flag case 0 Statements case 1 statements case 2 statements otherwise statements end
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Initialization o Case 0:  initialization o First, Simulink sends flag=0, which: o Declares things (x, t, y, u) o Sets x to an initial value (x0) o
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