loop in optim

You are right Joshua.

I changed the code because I failed to understand how you attached the
full data set. How you made the data part of your code.

I am new to R so I am used to one way of attaching data(the way I redone
it).

You don't need to "attach" the data by using attach().
You read the data into an object afull and then select the part you need and
store that in object a.

BTW: shouldn't the for (i in 1:4) be for (i in 1:3) if I understand the
original question correctly?

Berend

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