[R] mgcv::gam error message for predict.gam

[David Katz]

Sometimes, for specific models, I get this error from predict.gam in library
mgcv:

Error in complete.cases(object) : negative length vectors are not allowed

 Here's an example:

model.calibrate <-
  gam(meansalesw ~ s(tscore,bs="cs",k=4),
      data=toplot,
      weights=weight,
      gam.method="perf.magic")


> test <- predict(model.calibrate,newdata)
Error in complete.cases(object) : negative length vectors are not allowed
> 

The data is shown below:

> toplot[,c("meansalesw","tscore","weight")]
   meansalesw      tscore weight
1   0.1275841 0.003446797  15224
2   0.1495748 0.004017158  15523
3   0.2245844 0.004375278  15520
4   0.2197668 0.004753941  15525
5   0.1317830 0.005049050  15524
6   0.2809621 0.005403199  15498
7   0.2933119 0.005764413  15529
8   0.4791150 0.006335145  15514
9   0.1833688 0.006617095  15528
10  0.3200599 0.007135850  15527
11  0.4931882 0.007781095  15529
12  0.4207684 0.008766088  15512
13  0.5928568 0.009731357  15514
14  0.8025296 0.010927579  15520
15  0.6286192 0.012004714  15513
16  0.7477922 0.014083143  15527
17  0.7251362 0.017382274  15531
18  1.1871948 0.025481173  15521
19  1.6495832 0.048264689  15524
20  5.1180227 0.131198022  15218

> newdata
     tscore
1 0.5059341
2 0.4125522
3 1.4335818
4 0.7060673
5 0.3229316

Thanks!
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