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1 #include "mplot.h"2 void range(double x0, double y0, double x1, double y1){3 e1->xmin = x0;4 e1->ymin = y0;5 e1->scalex = e1->sidex / (x1 - x0 );6 e1->scaley = e1->sidey / (y1 - y0 );7 e1->quantum=e0->quantum/sqrt(e1->scalex*e1->scalex +8 e1->scaley*e1->scaley);9 if(e1->quantum < .01)10 e1->quantum = .01;11 }