add mention to error in transform

stefanocoretta · Aug 2, 2018 · 8e48aee · 8e48aee
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diff --git a/vignettes/polar-gams.Rmd b/vignettes/polar-gams.Rmd
@@ -34,6 +34,8 @@ tongue
 The spline data is in cartesian coordinates. The function `polar_gam()` converts the coordinates to polar and fits a GAM to the data.
 The polar coordinates are calculated based on the origin of the probe, which is estimated if `origin = NULL` using the fan lines specified with the argument `fan_lines` (the defaults are `c(10, 25)`).
 
+If you get an error relating to `lm.fit`, try to change the `fan_lines` to values different from the default.
+
 ```{r polar-place}
 tongue_it01 <- filter(tongue, speaker == "it01")
 

diff --git a/vignettes/transform-coord.Rmd b/vignettes/transform-coord.Rmd
@@ -46,6 +46,8 @@ polar <- tongue %>%
 The function returns a data set with two new columns: `radius` and `theta`.
 It also prints the calculated origin.
 
+If you get an error relating to `lm.fit`, try to change the `fan_lines` to values different from the default.
+
 We can now plot the contours using polar coordinates in a cartesian system.
 Notice that the tip of the tongue is on the left (rather than the right, as in the original data).