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How to get the R (not R^2) from a linear regression 'poly1'?

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Cheng Zhang 2021-11-7

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https://ww2.mathworks.cn/matlabcentral/answers/1581084-how-to-get-the-r-not-r-2-from-a-linear-regression-poly1

编辑： the cyclist 2021-11-8

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When I use

[f,gof,output] = fit(x,y,'poly1')

I can get

gof = 
  struct with fields:
           sse: 0.3126
       rsquare: 0.9843
           dfe: 1
    adjrsquare: 0.9686
          rmse: 0.5591
          

Is that possible to get the coefficient r as well, not the square of coefficient?

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the cyclist 2021-11-8

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编辑：the cyclist 2021-11-8

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Assuming you just want the correlation coefficient of the data, you don't need the model:

corrcoef(x,y)

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