Re: [R] Pascal's Triangle

[Spencer Graves]

n <- 5
PascalsTriangle <- vector('list', n)
PascalsTriangle[[1]] <- 1
for(i in 2:n){
    x0 <- PascalsTriangle[[i-1]]
    x01 <- c(0, x0)
    x10 <- c(x0, 0)
    PascalsTriangle[[i]] <- x01+x10
}


I hope I'm not doing a homework problem.


Spencer


On 12/28/2011 1:53 AM, Jason J. Pitt wrote:

Oh and also, if it makes sense, you can use n choose k (
choose() ) to calculate each element of the triangle if you
don't want to deal with indicies, addition, etc.

Jason

---- Original message ----

Date: Wed, 28 Dec 2011 03:42:11 -0600 (CST)
From: r-help-boun...@r-project.org (on behalf of "Jason J.

Pitt"<pit...@uchicago.edu>)

Subject: Re: [R] Pascal's Triangle
To: "Matilda E. Gogos"<matildaelizabe...@gmail.com>, r-

h...@r-project.org

Hi Matilda,

My ignorance of the mathematical properties of Pascal's
Triangle might make me overlook a much easier way to do this,
but my first brute force thought was to use a list to store
each level of the triangle (i.e. a list of vectors). You can
then use the values of the previous level to calculate the
values of the next level.

Then it should just be a matter of formatting using spaces or
tabs and printing each level (vector) in the list. There may
be some nuances to this depending how you want it to look,

but

nothing a little trial and error and Googling can't solve.

HTH,

Jason

---- Original message ----

Date: Tue, 27 Dec 2011 23:14:27 -0500
From: r-help-boun...@r-project.org (on behalf of "Matilda E.

Gogos"<matildaelizabe...@gmail.com>)

Subject: [R] Pascal's Triangle
To: r-help@r-project.org

Hello,

Looking to generate Pascal's triangle in R. How do I get

started? Thanks,

--
Matilda Gogos
matildaelizabe...@gmail.com

        [[alternative HTML version deleted]]

______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-

project.org/posting-guide.html

and provide commented, minimal, self-contained, reproducible

code.

______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-

project.org/posting-guide.html

and provide commented, minimal, self-contained, reproducible

code.

______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

--
Spencer Graves, PE, PhD
President and Chief Technology Officer
Structure Inspection and Monitoring, Inc.
751 Emerson Ct.
San José, CA 95126
ph:  408-655-4567
web:  www.structuremonitoring.com

______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.