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关注:
1) origin数据积分、寻峰
2) origin数据平滑处理
https://www.originlab.com/origin#Peak_Analysis
https://www.originlab.com/doc/Origin-Help/Smooth-Algorithm
Lowess and Loess are abbreviations for "locally weighted scatterplot smoothing" or "locally weighted least squares". We say "locally" because we calculate each smoothed value using neighboring points contained within a span of values. This method is classically performed by the following steps:
Calculate weights for a center point , and all neighboring points contained within the span, using the tri-cube weight function...where is a neighbor point within the span associated to the current center point , and is the distance along the abscissa from to the most distant neighbor points within the span.
Perform the weighted least square regression.
For Lowess, a weighted linear regression is used.
For Loess, a second-order polynomial regression is used.
Obtain predicted value given in the step2 for .
Move to next point , then perform step1-3 to get predicted value . The calculation stops when all points are calculated.
https://jingyan.baidu.com/article/fa4125ac2fa80e28ac709298.html
https://jingyan.baidu.com/article/00a07f386efe2d82d128dc62.html
用Origin左侧工具栏上的 “数据范围选取工具”(双箭头那个),点击一下图标,会看到图线中的起点和终点位置分别出现两个相背的箭头,然后用鼠标分别拉动这两个箭头到你希望平滑的图线部分。按回车键确定范围。按下回车之后,双箭头变成箭头相对的方向(这样操作之后,你下一步的平滑工作就只对这个范围内的图线进行操作,而不会影响选取范围之外的图线)。
点击Origin菜单栏上的 Analysis ——> Signal Process ——> Smooth ——> Open Dialog
在弹出的对话框中,选择 Method: FFT Filter。然后自己试试调节一下 Points of Window,以获得你满意的效果,点击OK 完成平滑
对话框中的参数可以根据平滑的效果而调节,不必担心参数设置好不好,设置不好可以再回来修改。一般我自己使用时,“recalculate”选择auto;method可以挨个挑选试试效果,差别不大;比较重要的是“points of window”,这个地方的数字越大,平滑曲线越光滑,但是越失真,这个根据自己的需要来定,一般该数字选择奇数。然后点击最下方的“preview”预览效果,如图。
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