Origin中拟合曲线任一点切线的绘制
1．打开Origin程序，输入数据：
![](https://wkrtcs.bdimg.com/rtcs/image?w=45.33&md5sum=5924de0df44c0ce3e2dbaea7b7496dc0&sign=216309f9f2&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=712&ipr={"t":"img","r":"r_1","w":"45.33","h":"17.33","dataType":"gif","c":"word/media/image1.gif"})
Long Name：物理量符号 Units：单位
Comments：注释 数据可以从Excel中粘贴或导入
2．选定数据，按下图中所指的按钮作图
![](https://wkrtcs.bdimg.com/rtcs/image?w=41.33&md5sum=5924de0df44c0ce3e2dbaea7b7496dc0&sign=216309f9f2&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=712&ipr={"t":"img","w":"41.33","h":"45.33","dataType":"gif","c":"word/media/image3.gif"})
3．结果如图
4．选中图中数据点，依次单击菜单“analysis”－“Fitting”－“Nonlinear Curve Fit …”，开启下图对话框
![](https://wkrtcs.bdimg.com/rtcs/image?w=394.67&md5sum=5924de0df44c0ce3e2dbaea7b7496dc0&sign=216309f9f2&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=712&ipr={"t":"img","r":"r_0","w":"394.67","h":"473.33","dataType":"gif","c":"word/media/image6.gif"})
其中
Category选择Rational
Function选择Holliday
效果如图所示，点击Fit按钮
出现的Reminder message提示框选择OK即可
5．效果如图
![](https://wkrtcs.bdimg.com/rtcs/image?w=45.33&md5sum=5924de0df44c0ce3e2dbaea7b7496dc0&sign=216309f9f2&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=712&ipr={"t":"img","w":"45.33","h":"17.33","dataType":"gif","c":"word/media/image1.gif"})
6．双击Book1，选择FitNLCurves1选项卡
选中A、B两列数据，并复制。点击新建工作表按钮（New Workbook），粘贴至新表的数据栏中
![](https://wkrtcs.bdimg.com/rtcs/image?w=45.33&md5sum=5924de0df44c0ce3e2dbaea7b7496dc0&sign=216309f9f2&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=712&ipr={"t":"img","r":"r_0","w":"45.33","h":"41.33","dataType":"gif","c":"word/media/image9.gif"})
7．选定作图（同第2步）
![](https://wkrtcs.bdimg.com/rtcs/image?w=45.33&md5sum=5924de0df44c0ce3e2dbaea7b7496dc0&sign=216309f9f2&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=712&ipr={"t":"img","r":"r_4","w":"45.33","h":"17.33","dataType":"gif","c":"word/media/image1.gif"})
得到拟合曲线
![](https://wkrtcs.bdimg.com/rtcs/image?w=41.33&md5sum=5924de0df44c0ce3e2dbaea7b7496dc0&sign=216309f9f2&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=712&ipr={"t":"img","w":"41.33","h":"45.33","dataType":"gif","c":"word/media/image12.gif"})
8．适用Tangent工具（上图中指出），双击曲线上的数据点，屏幕上会出现其坐标值，以及该点的切线和切线斜率
9．点击屏幕上的保存图标即可保存。
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