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Adapted: wall-corrected coefficients of the wing-body-tail runs, drag in counts (1e-4), rounded; NAI-fnet's and the look-up table's predictions 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0.0166·(hinge(α − 3/M))","+ 0.013·(exp(−hinge(α − Re)))","+ 0.00136·(M·(α + hinge(iₜ)))","− 0.0105·(M + hinge(α − Re))","+ 0.00763·(hinge(α)·M^3)","+ 0.00285·(hinge(M^iₜ − α))","+ 0.0173·(hinge(α − Re)/M)","− 0.0287·(hinge(√(hinge(α)) − 2))","+ 0.0329·(M^hinge(α − Re))","− 8.29e-05·(Re − α·iₜ)"],"best":10},"code":{"bytes":20608,"ns":2282,"lines":["#include <math.h>","","/* part of the model: its neurons, as formulas */","static double fnet_core0(const double x[5]) {","    double s = (double)-0.027483959102411817;","    s += (double)0.016569767386474459 * fnet_hinge_d((x[0] - ((double)3 / x[1])));","    s += (double)0.013047982919484452 * exp((-fnet_hinge_d((x[0] - x[2]))));","    s += (double)0.0013574834793989941 * (x[1] * (x[0] + fnet_hinge_d(x[4])));","    s += (double)-0.010480822329322858 * (x[1] + fnet_hinge_d((x[0] - x[2])));","    s += (double)0.0076282516741409912 * (fnet_hinge_d(x[0]) * pow(x[1], (double)3));","    s += (double)0.0028488003443069934 * fnet_hinge_d((pow(x[1], x[4]) - x[0]));","    s += (double)0.017307234865750028 * (fnet_hinge_d((x[0] - x[2])) / x[1]);","    s += (double)-0.028681660839061207 * fnet_hinge_d((sqrt(fnet_hinge_d(x[0])) - (double)2));","    s += (double)0.032913578042046095 * pow(x[1], fnet_hinge_d((x[0] - x[2])));","    s += (double)-8.2948048276274409e-05 * (x[2] - (x[0] * x[4]));","    return s;","}","","/* ... the rest of the model ... */","","FNET_REAL fnet_predict(const FNET_REAL xin[]);","FNET_REAL fnet_predict(const FNET_REAL xin[]) { /* ... */ }"]},"text":{"record":{"title":"1 · Record","body":"In the National Transonic Facility, a model of a modern wide-body airliner sits on a sting; its balance measures lift, drag and pitching moment while the angle of attack sweeps, at Mach 0.70 to 0.85 and Reynolds numbers up to 30 million. <b>659 measured points</b>, 35 runs."},"train":{"title":"2 · Train","body":"On a PC, NAI-fnet grows a network for the drag coefficient from the angle of attack, Mach, Reynolds number, dynamic pressure and the tail's setting. Growth stops at <b>10 neurons</b>."},"flash":{"title":"3 · Flash","body":"The model becomes plain C: <b>20,608 bytes</b>, about 2,282 ns a prediction, for the flight computer's performance functions, in place of a multi-dimensional table."},"run":{"title":"4 · Run","body":"Runs the model has never seen: one inside the measured range, then Mach 0.86 and 0.87, beyond it, where the drag starts to rise steeply. The chip's drag here is off by <b>27 counts</b>; a look-up table of the same measurements, which can only hold its last values beyond them, by 244. The chip also says when it is beyond its data."},"status":{"record":"","train":"training on a PC · the measured points only","flash":"writing the C code into the flight computer","run":"","unit":"s","scale":1}}}