用MMA画曲线的交点

青青子衿

数值求解交点，加上交点的标签

1. coords = ({x, y} /. NSolve[{y^2 == x^3 - x + 1, y == x}, {x, y}]);
2. deviations = {{+0.2, -0.3}, {+0.4, -0.2}, {+0.4, -0.2}};
3. points =
4.   MapThread[{Style[
5.       StringJoin["(", Riffle[Map[ToString, #1], ", "], ")"], Bold,
6.       Red, Background -> Yellow], #1 + #2} &, {coords, deviations}];
7. pointtext = Text[#1, #2] & @@@ points
8. ContourPlot[{y^2 == x^3 - x + 1, y == x}, {x, -3, 3}, {y, -3, 3},
9. Epilog -> {PointSize[Large], Point[#] & /@ coords, pointtext},
10. PlotLegends -> LineLegend["Expressions"]]

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