On 11/14/2006 6:00 PM, Steve Su wrote:> Dear All,
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> I noticed that optimize in R 2.4.0 on Windows XP does not seem to work
> if I use "m" as an argument in my function for example:
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>> optimize(function(x,m) x^m,interval=c(0,1),m=2)
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> Error in f(arg, ...) : argument "m" is missing, with no default
Take a look at the header for optimize:
> optimize
function (f, interval, lower = min(interval), upper = max(interval),
maximum = FALSE, tol = .Machine$double.eps^0.25, ...)
Unfortunately, the ... comes after the other arguments, so partial name
matching will be attempted. By saying m=2 you've set the maximum arg to 2.
You can avoid this by specifying maximum explicitly, e.g.
> optimize(function(x, m) x^m, interval=c(0,1), maximum=FALSE, m=2)
$minimum
[1] 6.610696e-05
$objective
[1] 4.37013e-09
Duncan Murdoch
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> But! If I change the argument to "a" then it works.
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>> optimize(function(x,a) x^a,interval=c(0,1),a=2)
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> $minimum
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> [1] 6.610696e-05
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> $objective
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> [1] 4.37013e-09
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> Why?
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> Steve.
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> [[alternative HTML version deleted]]
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