[R] Using the R commands
ripley@stats.ox.ac.uk
ripley at stats.ox.ac.uk
Sun Mar 30 09:25:34 CEST 2003
On Sat, 29 Mar 2003, Jonathan Baron wrote:
> On 03/30/03 03:25, Marcus V. Stecklow wrote:
>
> >I`m doing a program and it`s have a loop using the for command. inside the
> >loop i have a variable and in each step of loop she have a new value.
> >
> >The question is: How can i store the values and make a table?
>
> For example:
> Squares <- rep(NA,10) # make an empty vector with 10 places
> for (i in 1:10) Squares[i] <- i^2 # fill it with squares
> Squares # print it
>
> Lots of other ways to do this. For example, you can use
> Squares <- {}
> for the first step.
The best idea is start out with a vector of the correct length and the
correct type (rep(NA, 10) is logical), e.g.
Squares <- numeric(10)
This helps for long vectors by reducing the number of copies made.
Squares <- {} is equivalent to setting the result to NULL, just more
obscure.
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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