[R-sig-Geo] Reproducibility of results from predict() function - raster package

[chris english]

Katie,

set.seed(123) on each run thru will (should) result in reproducibility.

set.seed(1234)
pred <- predict(

Chr

On Oct 27, 2016 7:19 PM, "Katherine Ransom" <lockhart.katherine at gmail.com>
wrote:
>
> Hi All,
> I am having trouble reproducing my results exactly when I make predictions
> with predict() and a saved gbm model object. Each time I run predict()
with
> the same model object and inputs (a raster stack), I get slightly
different
> values (max value within 0.7 for a range of predictions from 0.08 to 12.30
> for example). However, there seems to be a limited amount of outcomes. For
> example, I can get the results to reproduce if I run predict enough times.
>
> The issue seems to be within the predict() function as it doesn't seem to
> be related to R session, loading package libraries, etc.
>
> Are there any random number generators or known bugs within the predict
> function that could be causing this behavior?
>
> Here is my code line that calls predict: pred <- predict(rstack, final,
> n.trees=final$n.trees,na.rm=TRUE,const=data.frame(WaterUse2="H"))  #
> family="gaussian"
>
> Not sure if I need the family = "gaussian" option. It doesn't seem to
> affect the results.
>
> Thank you,
> Katie
>
> --
> --
> Katherine Ransom
> PhD Candidate
> Hydrologic Sciences Graduate Group
> UC Davis
>
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>
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