1、如图所示,假设需要获取椭圆圈内的最大极值点的坐标。
![](https://iknow-pic.cdn.bcebos.com/bf096b63f6246b6022978c7fe4f81a4c510fa21b?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
2、显然,该函数图像上点的分布十分密集,为了能够拾取到正确的点,需要放大图像。使用放大图像按钮,框选需要放大的区域。
![](https://iknow-pic.cdn.bcebos.com/0b7b02087bf40ad16b20fee8582c11dfa8eccef0?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
3、继续放大函数图像,到各点可清晰分辨为止,如图所示。
![](https://iknow-pic.cdn.bcebos.com/8d5494eef01f3a29560fecc59625bc315d607cf1?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
4、使用数据游标按钮,在最大极值点上或其附近点击,便拾取到了该最大极值点,其坐标也自动显示出来。本实例的最大极值点坐标为(4,2.22*10^9)。
![](https://iknow-pic.cdn.bcebos.com/d31b0ef41bd5ad6e663e5de18ecb39dbb7fd3cf1?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
5、如果放大图像时,框选区域设置的不合理,可以通过平移按钮,将最大极值点拖至图像中央。
![](https://iknow-pic.cdn.bcebos.com/b999a9014c086e06187a01400d087bf40bd1cbee?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
6、最后若要获取更精确的坐标数值,可以在所拾取点的右键菜单中,选择将游标数据导出到工作区中再查看。
![](https://iknow-pic.cdn.bcebos.com/95eef01f3a292df5f2f0ef19b3315c6034a8738e?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)