[R] Solving an equation in R (and using a loop)

leohearn leohearn at dal.ca
Thu Oct 15 23:18:11 CEST 2009

So, I have a dataset and I'm trying to solve for a parameter in an equation
using the dataset. Before applying more sophisticated statistical
techniques, I want to tell R to solve it out for each observation. I know I
have to use a loop for it (and I have done that before, but am a bit rusty),
but before I do that, I'm trying to get R to solve it for just one
observation, to make sure that I have that part right before applying to the
rest. However, when I do it, I get 0 for an answer, which is a valid answer,
but a trivial one. What am I doing wrong? (tips for the loop would also be
appreciated, but this is my main concern right now.)

Here's my code:

r is the unknown. I've plugged in a couple numbers from my data for b, x1,
and x2 such as:
and gotten 0 both times.

Thanks in advance for your help.
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