1、首先双击打开电脑桌面上matlab软件,点击matlab操作界面上面的新建变量,如下图所示。
![](https://iknow-pic.cdn.bcebos.com/dbb44aed2e738bd46962a050b18b87d6277ff914?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
2、这时候会出现一个表格,此时将你需要处理的数据填在表格,有几个变量就要新建几个表格,本例子用两个变量,分别为X,Y。
![](https://iknow-pic.cdn.bcebos.com/a8014c086e061d95e30525596bf40ad162d9ca14?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
3、新建的X数据如下图,此时变量默认为unnamed(未命名)。
![](https://iknow-pic.cdn.bcebos.com/1c950a7b02087bf4e6af4588e2d3572c11dfcf14?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
4、接着对所需要的变量进行命名,下面以X为说明,右击选择重命名,输入X。
![](https://iknow-pic.cdn.bcebos.com/7acb0a46f21fbe09651cd1757b600c338744ad14?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
5、然后在命令窗口输入cftool,点击电脑Enter键,如下图所示。
![](https://iknow-pic.cdn.bcebos.com/5ab5c9ea15ce36d3f74691512af33a87e950b114?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
6、最后从列表中选择Smoothing Spline(平滑逼近),如下图所示,这样Smoothing Splinel拟合曲线就做好了。
![](https://iknow-pic.cdn.bcebos.com/2fdda3cc7cd98d1042961e50313fb80e7bec9014?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)