Trend lines

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Chloe
Chloe 2012-1-31
回答： Chad Greene 2015-1-22
Hi, I am trying to plot linear trend lines for a number of data sets and determine their respective gradients. Is there any way of doing this without using the 'tools,basic fitting' tab in the figure? Doing this for every plot will be quite time consuming. Sorry, I know this is probably a pretty basic question, but I'm pretty new to Matlab and would really appreciate any help. Thanks Chloe x

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Sean de Wolski
Sean de Wolski 2012-1-31
Perhaps polyfit() and polyval()?
doc polyfit
doc polyval

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Chad Greene
Chad Greene 2015-1-22
...Or to streamline the polyfit -> polyval -> plot process, polyplot does it all in one step, just like this:
polyplot(x,y)
You can also include any line formatting commands, just as you would with plot. For example,
polyplot(x,y,'r--','linewidth',3)

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