[R] Problems plotting a function defined as a product

[Jacques VESLOT]

plot(t, sapply(t,g))
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Jacques VESLOT

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Alessandro Antonucci a écrit :
> 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)
>>plot(t,g(t),type="l")
> 
> 
> 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
> 
>