[R] Help please with error from nnet::multinom

[Bert Gunter]

Well, for one thing, there is no "probs" method for predict.nnet, at
least in my version: nnet_7.3-12

Cheers,
Bert


Bert Gunter

"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Sun, Jun 26, 2016 at 9:27 AM, Lars Bishop <lars52r at gmail.com> wrote:
> Hello,
>
> I'd appreciate your help in spotting the reason for the error and warning
> messages below.
>
> library(nnet)
> set.seed(1)
> ysim <- gl(3, 100)
> y <- model.matrix(~ysim -1)
> X <- matrix( 3 * runif(length(ysim)), nrow = 300, ncol = 3)
> X_new <- matrix( 3 * runif(length(ysim)), nrow = 200, ncol = 3)
>
> fit <- multinom(y ~ X, trace = FALSE)
> pred <- predict(fit, X_new, type = "probs")
>
> Error in predict.multinom(fit, X_new, type = "probs") :
>   NAs are not allowed in subscripted assignments
> In addition: Warning message:
>   'newdata' had 200 rows but variables found have 300 rows
>
> Thanks,
> Lars.
>
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>
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