R help - May 2009 - any suggestions on this error?

Error in matrix(unlist(value, recursive = FALSE, use.names = FALSE), nrow nr,  :
  invalid 'ncol' value (too large or NA)

the statement was:
for (i in v) {for (j in m[0,]){if(v[i]==m[0,j]){M[,-j]}}} 


where 'v' is a vector, and 'm' and 'M' are both
matrices.
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onyourmark wrote:
> Error in matrix(unlist(value, recursive = FALSE, use.names = FALSE), nrow
> nr,  :
>   invalid 'ncol' value (too large or NA)
> 
> the statement was:
> for (i in v) {for (j in m[0,]){if(v[i]==m[0,j]){M[,-j]}}} 

That code does not make sense at all:

- What is m[0,] ? Note that R starts counting at 1 ...
- You action is  "M[,-j]", but that doe snot do anything except for 
internally returning that matrix into the empty space.

So, if you tell us what you are really going to do, we might be able to 
help better.


Uwe Ligges

> 
> where 'v' is a vector, and 'm' and 'M' are both
matrices.

You have use a zero index.  This is not allowed in R (normally).

Also your code, even if corrected, would do nothing so I suspect your problems
do not stop there.

Did you really mean "for(i in v) .... if(v[i] ... "?  Very subtle if
you did.


Bill Venables
http://www.cmis.csiro.au/bill.venables/ 


-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of onyourmark
Sent: Saturday, 2 May 2009 2:19 PM
To: r-help at r-project.org
Subject: [R] any suggestions on this error?


Error in matrix(unlist(value, recursive = FALSE, use.names = FALSE), nrow nr,  :
  invalid 'ncol' value (too large or NA)

the statement was:
for (i in v) {for (j in m[0,]){if(v[i]==m[0,j]){M[,-j]}}} 


where 'v' is a vector, and 'm' and 'M' are both
matrices.
-- 
View this message in context:
http://www.nabble.com/any-suggestions-on-this-error--tp23342888p23342888.html
Sent from the R help mailing list archive at Nabble.com.

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