/* The source code for generating the above plot */ #include <math.h> #include <chplot.h> #define POINTS 50 // number of data points for each curve int main() { double t[POINTS], b0[POINTS], b1[POINTS], b2[POINTS], b3[POINTS]; class CPlot plot; int i; /* get values of Bessel functions */ for(i=0; i< POINTS; i++) { t[i] = 1+i*(10.0-1)/(POINTS-1); b0[i] = j0(t[i]); b1[i] = j1(t[i]); b2[i] = jn(2, t[i]); b3[i] = jn(3, t[i]); } plot.title("Bessel functions"); // title plot.label(PLOT_AXIS_X,"t"); // x-label plot.label(PLOT_AXIS_Y,"j0, j1, j2, j3"); // y-label plot.data2DCurve(t, b0, POINTS); // plotting data plot.data2DCurve(t, b1, POINTS); // plotting data plot.data2DCurve(t, b2, POINTS); // plotting data plot.data2DCurve(t, b3, POINTS); // plotting data plot.legend("j0", 0); // legend for j0 plot.legend("j1", 1); // legend for j1 plot.legend("j2", 2); // legend for j2 plot.legend("j3", 3); // legend for j3 plot.size(.40, 0.45); // change default plot size 640x480 /* output of the plot as a png file, instead of displaying on screen by default */ plot.outputType(PLOT_OUTPUTTYPE_FILE, "png", "bessel.png"); plot.plotting(); return 0; }