kappa = ((5*(-3*xx1-3*xx0-6*x0+6*x1)*t^4+4*(7*xx1+8*xx0+15*x0-15*x1)*t^3+3*(-4*xx1-6*xx0-10*x0+10*x1)*t^2+xx0)*(20*(-3*yy1-3*yy0-6*y0+6*y1)*t^3+12*(7*yy1+8*yy0+15*y0-15*y1)*t^2+6*(-4*yy1-6*yy0-10*y0+10*y1)*t)-(5*(-3*yy1-3*yy0-6*y0+6*y1)*t^4+4*(7*yy1+8*yy0+15*y0-15*y1)*t^3+3*(-4*yy1-6*yy0-10*y0+10*y1)*t^2+yy0)*(20*(-3*xx1-3*xx0-6*x0+6*x1)*t^3+12*(7*xx1+8*xx0+15*x0-15*x1)*t^2+6*(-4*xx1-6*xx0-10*x0+10*x1)*t))/((5*(-3*xx1-3*xx0-6*x0+6*x1)*t^4+4*(7*xx1+8*xx0+15*x0-15*x1)*t^3+3*(-4*xx1-6*xx0-10*x0+10*x1)*t^2+xx0)^2+(5*(-3*yy1-3*yy0-6*y0+6*y1)*t^4+4*(7*yy1+8*yy0+15*y0-15*y1)*t^3+3*(-4*yy1-6*yy0-10*y0+10*y1)*t^2+yy0)^2)^(3/2);\r
plot(t, kappa, '+m');\r
end\r
-keyboard\r
+\r
end
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