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2017 Mar 19
2
outer not applying a constant function
...<- Deriv(f,"y")
fxy <- Deriv(Deriv(f,"y"),"x")
fxx <- Deriv(Deriv(f,"x"),"x")
fyy <- Deriv(Deriv(f,"y"),"y")
fg <- outer(xg,yg,f)
fxg <- outer(xg,yg,fx)
fyg <- outer(xg,yg,fy)
fxyg <- outer(xg,yg,fxy)
fxxg <- outer(xg,yg,fxx)
fyyg <- outer(xg,yg,fyy)
And with
f <- function(x,y) x+y
it stops working. Of course I can manually fix this for that special case, but thats not my point. I simply thought "outer" should be able to handle constant functions.
Best regards
Albrecht
[[...
2017 Mar 20
1
outer not applying a constant function
...lt;- Deriv(Deriv(f,"x"),"x")
> > fyy <- Deriv(Deriv(f,"y"),"y")
>
> > fg <- outer(xg,yg,f)
> > fxg <- outer(xg,yg,fx)
> > fyg <- outer(xg,yg,fy)
> > fxyg <- outer(xg,yg,fxy)
> > fxxg <- outer(xg,yg,fxx)
> > fyyg <- outer(xg,yg,fyy)
>
> > And with
>
> > f <- function(x,y) x+y
>
> > it stops working. Of course I can manually fix this for that special case, but thats not my point. I simply thought "outer" should b...
2017 Mar 20
0
outer not applying a constant function
...ot;),"x")
> fxx <- Deriv(Deriv(f,"x"),"x")
> fyy <- Deriv(Deriv(f,"y"),"y")
> fg <- outer(xg,yg,f)
> fxg <- outer(xg,yg,fx)
> fyg <- outer(xg,yg,fy)
> fxyg <- outer(xg,yg,fxy)
> fxxg <- outer(xg,yg,fxx)
> fyyg <- outer(xg,yg,fyy)
> And with
> f <- function(x,y) x+y
> it stops working. Of course I can manually fix this for that special case, but thats not my point. I simply thought "outer" should be able to handle constant functi...