ModSim ass3: Added harmonic oscillator assignment.

modsim/ass3/.gitignore

 test
+harm_osc

modsim/ass3/harm_osc.c

@@ -16,11 +16,13 @@
     INTEGRATE(RungeKutta2, t0, t1); \
     INTEGRATE(RungeKutta4, t0, t1); \
 }
-/*
+
+extern log_function log_func;
+
 void log(double t, double *y) {
     printf("%f,%f,%f\n", t, y[0], y[1]);
 }
-*/
+
 int f_osc(double t, double *y, double *dy, void *params) {
     dy[0] = y[1];
     dy[1] = -*(double *)(params) * y[0];
@@ -31,6 +33,8 @@ int f_osc(double t, double *y, double *dy, void *params) {
 int main(void) {
     double k = .5, y0[2] = {.0, 5.0}, y1[2] = {.0, .0};
 
+    log_func = &log;
+
     COMPARE(.0, 10.0)
 
     return 0;