On 30/10/2009, at 11:35 AM, Gabor Grothendieck wrote:
Try this:
deriv(expression(x^2+y^3, x^5+y^6), c("x","y"))
Did *you* try it Gabor? I did just now and it returns only
the gradient of the first component:
> deriv(expression(x^2+y^3, x^5+y^6), c("x","y"))
expression({
.value <- x^2 + y^3
.grad <- array(0, c(length(.value), 2L), list(NULL, c("x",
"y")))
.grad[, "x"] <- 2 * x
.grad[, "y"] <- 3 * y^2
attr(.value, "gradient") <- .grad
.value
})
cheers,
Rolf Turner
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