Weird operator behaviour

Argument recycling is coming into play here with !=.  I am guessing you want

! fish$Species %in% c("CRA", "PHC")

?

Best Regards,
Erik Iverson
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of jimdare
Sent: Tuesday, November 03, 2009 4:02 PM
To: r-help at r-project.org
Subject: [R] Weird operator behaviour

Hi,

I have a dataset called 'fish'.  fish$Species returns extract 1.  When I
use
fish$Species != c("CRA","PHC"), i.e. I want all species except "CRA" and
"PHC", I get extract 2 which is blatantly wrong.  Can anyone see what I'm
doing wrong?

Regards,
James

EXTRACT 1

fish$Species
  [1] ALB ALB ALB ALB ALB ALB ALB ALB ALB ALB ALB ALB ALB ALB ALB ALB ATO
ATO
 [19] ATO ATO ATO ATO ATO ATO BIG BIG BIG BIG BIG BIG BIG BIG BIG BIG BIG
BIG
 [37] BIG BIG BWS BWS BWS BWS BWS BWS BWS BWS BWS BWS BWS BWS BWS BWS BWS
CRA
 [55] CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA
CRA
 [73] CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA
CRA
 [91] CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA
CRA
[109] CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA
CRA
[127] CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA
CRA
[145] CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA
CRA
[163] CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA
CRA
[181] CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA
CRA
[199] CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA
CRA
[217] CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA
CRA
[235] CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA
CRA
[253] CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA CRA
CRA
[271] CRA CRA CRA CRA CRA CRA CRA CRA MAK MAK MAK MAK MAK MAK MAK MAK MAK
MAK
[289] MAK MAK MAK MAK MAK MOO MOO MOO MOO MOO MOO MOO MOO MOO MOO MOO MOO
MOO
[307] MOO MOO PHC PHC PHC PHC PHC PHC PHC PHC PHC PHC PHC PHC PHC PHC PHC
PHC
[325] PHC PHC PHC POS POS POS POS POS POS POS POS POS POS POS PTO PTO PTO
PTO
[343] PTO PTO PTO PTO PTO PTO PTO PTO PTO PTO PTO RBM RBM RBM RBM RBM RBM
RBM
[361] RBM RBM RBM RBM RBM RBM RBM RBM SKJ SKJ SKJ SKJ SKJ SKJ SKJ SKJ SKJ
SKJ
[379] SKJ SKJ SKJ SKJ SKJ STM STM STM STM STM STM STM STM STN STN STN STN
STN
[397] STN STN STN STN STN STN STN STN STN STN STN STN STN STN STN STN STN
STN
[415] SWO SWO SWO SWO SWO SWO SWO SWO SWO SWO SWO SWO SWO SWO SWO SWO TOR
TOR
[433] TOR TOR TOR TOR TOR TOR YFN YFN YFN YFN YFN YFN YFN YFN YFN YFN YFN
YFN
[451] YFN YFN YFN YFN
17 Levels: ALB ATO BIG BWS CRA MAK MOO PHC POS PTO RBM SKJ STM STN SWO ...
YFN

EXTRACT 2

fish$Species != c("CRA","PHC")
  [1]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE
TRUE
 [13]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE
TRUE
 [25]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE
TRUE
 [37]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE
TRUE
 [49]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
 [61] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
 [73] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
 [85] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
 [97] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
[109] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
[121] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
[133] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
[145] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
[157] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
[169] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
[181] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
[193] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
[205] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
[217] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
[229] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
[241] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
[253] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
[265] FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE
TRUE
[277] FALSE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE
TRUE
[289]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE
TRUE
[301]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE FALSE  TRUE
FALSE
[313]  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE
FALSE
[325]  TRUE FALSE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE
TRUE
[337]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE
TRUE
[349]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE
TRUE
[361]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE
TRUE
[373]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE
TRUE
[385]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE
TRUE
[397]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE
TRUE
[409]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE
TRUE
[421]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE
TRUE
[433]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE
TRUE
[445]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE

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Weird operator behaviour

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