[R] comparing matrices

[ONKELINX, Thierry]

Have a look at all.equal

matA <- matrix(1:4, ncol = 2)
matB <- matA
all.equal(matA, matB)
matB[1,1] <- -10
all.equal(matA, matB)

HTH,

Thierry 


------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium 
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be 
www.inbo.be 

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens Esmail
Verzonden: zondag 26 april 2009 19:03
Aan: R mailing list
Onderwerp: [R] comparing matrices

I'm trying to compare two matrices made up of bits.

doing a simple comparison of

         matA == matB

yields this sort of output.

       [,1] [,2]  [,3]  [,4]  [,5]  [,6]
[1,] FALSE TRUE FALSE  TRUE  TRUE FALSE
[2,]  TRUE TRUE  TRUE  TRUE  TRUE  TRUE
[3,] FALSE TRUE FALSE FALSE FALSE  TRUE
[4,] FALSE TRUE  TRUE FALSE FALSE FALSE
[5,]  TRUE TRUE  TRUE  TRUE FALSE FALSE
[6,]  TRUE TRUE  TRUE  TRUE FALSE FALSE

I really would like just one comprehensive value to say TRUE or FALSE.

This is the hack (rather ugly I think) I put together that works,
but there has to be a nicer way, no?

     res=pop[1:ROWS,] == keep[1:ROWS,]

     if ((ROWS*COL) == sum(res))
      {
        cat('they are equal\n')
      }else
        cat('they are NOT equal\n')

Thanks!

Esmail

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