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

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?

Answer 1

[the cyclist]

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

corrcoef(x,y)