[R-sig-Geo] Error with function kfold in package dismo

[Manuel Spínola]

  Thank you very much Robert.
Best,

Manuel

On 02/10/2010 12:11 p.m., Robert J. Hijmans wrote:
> Manuel,
>
> This looks like a bug in 'raster' that I think I have fixed in version
> 1.5-13 (should be available on R-Forge in 24 hrs or so).
>
> As a work around, you can save ascii files to binary (once):
>
> predictores<- writeRaster(predictores, 'predictores.grd' )
> # or
> predictores<- writeRaster(predictores, 'predictores.tif' )
>
> and then in the script use:
>
> predictores<- brick('predictores.grd')
> # or
> predictores<- brick('predictores.tif')
>
>
> This also has the advantage of being much faster.
>
> Robert
>
> On Sat, Oct 2, 2010 at 3:11 PM, Manuel Spínola<mspinola10 at gmail.com>  wrote:
>>   Dear list members,
>>
>> I got this error in package "dismo".
>>
>> fold<- kfold(bradypus, k=5)
>>> bradytrain<- bradypus[fold != 1, ]
>>> me<- maxent(predictores, bradytrain)
>> Error en .readRowsAscii(raster, rows[i], 1) : elemento 1 esta vacio;
>>   la parte de la lista de argumentos  '>' ha sido evaluada:
>>    (startcol, 1)
>>
>> Function maxent works perfect for "bradypus" (data frame with 116
>> observations), but it doesn't work for "bradytrain" when I use kfold
>> function.
>> "bradytrain" is also a data frame but with 93 observations.  The message is
>> in Sapnish, but basically say that element 1 is empty.
>>   Thank you very much in advance.
>>   Best,
>>
>> Manuel
>>
>> --
>> Manuel Spínola, Ph.D.
>> Instituto Internacional en Conservación y Manejo de Vida Silvestre
>> Universidad Nacional
>> Apartado 1350-3000
>> Heredia
>> COSTA RICA
>> mspinola at una.ac.cr
>> mspinola10 at gmail.com
>> Teléfono: (506) 2277-3598
>> Fax: (506) 2237-7036
>>
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>>


-- 
Manuel Spínola, Ph.D.
Instituto Internacional en Conservación y Manejo de Vida Silvestre
Universidad Nacional
Apartado 1350-3000
Heredia
COSTA RICA
mspinola at una.ac.cr
mspinola10 at gmail.com
Teléfono: (506) 2277-3598
Fax: (506) 2237-7036