[R] Problems plotting a function defined as a product

Alessandro Antonucci alessandro at idsia.ch
Thu Jul 13 14:44:49 CEST 2006

In order to define a function f as:

> f <- function(x) (x+1)*(x+2)

I want to use the notation:

> v = c(1,2)
> g <- function(x) prod((v+x))

That apparently works and, for instance,
the loop:

>for (i in 1:100) {  print(f(i)-g(i)) }

Produces a sequence of zeros.

Nevertheless, if I try to plot
the function g by:

>t = seq(0,100,1)

I obtain the following errors/warning:

> Error in xy.coords(x, y, xlabel, ylabel, log) : 
>        'x' and 'y' lengths differ
>In addition: Warning message:
>longer object length
>        is not a multiple of shorter object length in: v + x 
>Execution halted

Any idea about that?

Kind regards,

Alessandro Antonucci
Dalle Molle Institute for Artificial Intelligence (IDSIA)
at Idsia			e-mail: alessandro at idsia.ch
Galleria 2			web:   idsia.ch/~alessandro
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Switzerland			skype: alessandro.antonucci

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