Boris Steipe <boris.ste...@utoronto.ca> writes: > I don't think the problem is well defined. Otherwise you could just > pick very small numbers from a range that is guaranteed to keep the > sum < h.
What further information is missing? That the variables should be
covering the whole range from 0 to 1?
OK - forgotten to state that h <- 1.
This is for a sensitivity analysis which I want to conduct on a complex
function.
Rainer
>
>
> B.
>
> On Oct 15, 2015, at 8:48 AM, Rainer M Krug <rai...@krugs.de> wrote:
>
>> Hi
>>
>> I need a Latin Hypercube with the following conditions:
>>
>> 0 < x[,"a"] < 1
>> 0 < x[,"b"] < 1
>> 0 < x[,"c"] < 1
>>
>> but also
>>
>> x[,"a"] + x[,"b"] < h
>>
>> The first three are easy:
>>
>> --8<---------------cut here---------------start------------->8---
>> n <- 1000
>>
>> lhc <- lhs::randomLHS(n=n, k=3
>> colnames(lhc) <- c("a", "b", "c")
>>
>> x <- lhc
>> --8<---------------cut here---------------end--------------->8---
>>
>> Now the last condition:
>>
>> I tried
>>
>> --8<---------------cut here---------------start------------->8---
>> h <- 28
>> x[,"a"] <- x[,"a"] / 2
>> x[,"b"] <- x[,"b"] / 2
>> --8<---------------cut here---------------end--------------->8---
>>
>> But this obviously reduces the individual ranges.
>>
>> Using the rowSum as in
>> https://stat.ethz.ch/pipermail/r-help/2013-October/361263.html
>>
>> makes the sum of the variables also to 2.
>>
>> So how can I create a Latin Hypercube which fulfills the conditions?
>>
>> Rainer
>>
>> --
>> Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology,
>> UCT), Dipl. Phys. (Germany)
>>
>> Centre of Excellence for Invasion Biology
>> Stellenbosch University
>> South Africa
>>
>> Tel : +33 - (0)9 53 10 27 44
>> Cell: +33 - (0)6 85 62 59 98
>> Fax : +33 - (0)9 58 10 27 44
>>
>> Fax (D): +49 - (0)3 21 21 25 22 44
>>
>> email: rai...@krugs.de
>>
>> Skype: RMkrug
>>
>> PGP: 0x0F52F982
>> ______________________________________________
>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
--
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology,
UCT), Dipl. Phys. (Germany)
Centre of Excellence for Invasion Biology
Stellenbosch University
South Africa
Tel : +33 - (0)9 53 10 27 44
Cell: +33 - (0)6 85 62 59 98
Fax : +33 - (0)9 58 10 27 44
Fax (D): +49 - (0)3 21 21 25 22 44
email: rai...@krugs.de
Skype: RMkrug
PGP: 0x0F52F982
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______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
