[R] Can I get rid of this for loop using apply?

[hadley wickham]

> Great suggestions.  I tested the code on an example and the run time was
> reduced from 1 min 12 sec to 3 sec.  Also, I like the suggestion to look at
> the quantiles.  I will see what insight it provides in terms of detecting
> masked interactions.

Well that's a decent speed up :)

> I have a couple questions about your code.
> First, why not use
> xs <- seq(min(x1), max(x1), length = 100) instead of
> xs <- with(m, seq(min(x1), max(x1), length = 100)) ?

No real reason, just to make it a bit easier when you generalise to
other data sets / models

> Second, what is the function geom_line()?  I couldn't find it.

It's in ggplot2 - http://had.co.nz/ggplot2/geom_line.html  -
?geom_line should find it too though (provided you have version 0.6 of
ggplot2)

Hadley


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