R-beta: spline problems(?)
A. Tsiolakidis
tsioltas at cs.keele.ac.uk
Tue Apr 7 04:30:33 CEST 1998
Hi,
I am a total beginner with this whole thing so please have patience!
I am trying to run an S-plus program with a certain line:
spline(1:nrow(y), y[,1],n=100);
This crashes with:
Error: NAs in foreign function call (arg 8)
Apparently, this is caused by the last command of spline:
u <- seq(xmin, xmax, length.out = n)
.C("spline_eval", z$method, length(u), x = u, y = double(n),
z$n, z$x, z$y, z$b, z$c, z$d)[c("x", "y")]
}
Now, I can cause that error with: spline(1:10,1:10)
So, there is a whole class of problems for which spline refuses to
compute anything - is this the correct behaviour? E.g.,
spline(1:10,(1:10)/2.5) #it is alright, but ...
spline(1:10,(1:10)/2) # this has the "NAs.." problem
Finally, I am almost sure that the y matrix in my program has quite
normal values, i.e. values that should allow for meaningful
interpolation.
Anybody knows what this all is about?
Thanks,
Tasos T.
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