[R] svd error
Prof Brian Ripley
ripley at stats.ox.ac.uk
Thu Jan 27 19:39:11 CET 2005
On Thu, 27 Jan 2005, Spencer Graves wrote:
> Dear Prof. Ripley:
> With library(MASS), I got the following in R 2.0.1 under Windows 2000:
>> X
> [,1] [,2]
> [1,] 1 3
> [2,] 2 NA
>> ginv(X)
> Error in svd(X) : infinite or missing values in x
>
> This may not relate to Tongtong Wu's problem, but it used "ginv" in
> library(MASS) as you suggested and did produce the cited error message.
I said `introduce'. The cause of the error is in X, not introduced by
ginv. pseudoinverse can introduce NaNs/infinities.
Please do remember the care I take when writing things.
BDR
> spencer graves
>
> Prof Brian Ripley wrote:
>
>> On Thu, 27 Jan 2005, WU,TONGTONG wrote:
>>
>>> Hi,
>>>
>>> I met a probem recently and need your help. I would really appreciate
>>> it.
>>>
>>> I kept receiving the following error message when running a program:
>>>
>>> 'Error in svd(X) : infinite or missing values in x'.
>>>
>>> However, I did not use any svd function in this program though I did
>>> include the function pseudoinverse. Is the problem caused by doing
>>> pseudoinverse?
>>
>>
>> Where did you find that function? It is not part of R as it ships, and it
>> *may* be part of GeneTS, where it calls svd after squaring the matrix. But
>> there are simpler pseudoinverse functions (e.g. ginv in MASS) that will not
>> introduce that error.
>>
>> The tool you needed was traceback(): try it to see what it tells you here.
>>
>
>
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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