Force begin/end slope of trendline scatterplot

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Tijmen 2021-4-12

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评论： Tijmen 2021-4-13

采纳的回答： Jan

Hi,

I have a scatterplot through which I want to plot a trendline. Using polyfit I get a line through my plot as seen in the picture below. This is a 2nd order polyfit. Higher order fits give less fitting lines. The line looks like it has a minimum, which is not desired. What I want to achieve is to fix the slope at x =1 to be 0 so that it has no minimum. How can I do this?

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Jan 2021-4-12

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https://ww2.mathworks.cn/matlabcentral/answers/799572-force-begin-end-slope-of-trendline-scatterplot#answer_673231

编辑：Jan 2021-4-12

See:

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Tijmen 2021-4-13

Thanks Jan! The second link, the polyfix function, does exactly what I want.

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