[R] Switch and integer
I searched the help list and the manual, but I do not find my mistake. Switch is working with character , with integer, but not in the third example Regards Knut count1 - 0 test =c(3,9,3,9,3,9,8,9,8,9,8,9,3,9,3,9,5,9,3,9,1,2,7,9,3,9,1,1,2,2,3,9,2,1,2,5,9,8,9,1,2) count1 - 0 for (i in 1:length(test)) switch (EXPR=test[i], 5 = print(test[i]), 6 = print(test[i]), 7 = print(test[i]), 8 = print(test[i]), 9 = print(test[i]) ) count1 # example from helpfile for(i in c(-1:3,9)) print(switch(i, 1,2,3,4)) # not working test =c(3,9,3,9,3,9,8,9,8,9,8,9,3,9,3,9,5,9,3,9,1,2,7,9,3,9,1,1,2,2,3,9,2,1,2,5,9,8,9,1,2) count1 - 0 for (i in 1:length(test)) switch (EXPR=test[i], 4 = count1 - count1 +1, 5 = count1 - count1 +1, 6 = count1 - count1 +1, 7 = count1 - count1 +1, 8 = count1 - count1 +1 ) count1 __ R-help@stat.math.ethz.ch 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.
Re: [R] Switch and integer
From the help entry for switch: If the value of EXPR is an integer between 1 and nargs()-1 then the corresponding element of ... is evaluated and the result returned. So, for integers you don't give names to the elements in ... This should work: test=c(3,9,3,9,3,9,8,9,8,9,8,9,3,9,3,9,5,9,3,9,1,2,7,9,3,9,1,1,2,2,3,9,2,1,2,5,9,8,9,1,2) count1 - 0 for (i in 1:length(test)) switch(EXPR=test[i], NULL, NULL, NULL, count1 - count1 +1, count1 - count1 +1, count1 - count1 +1, count1 - count1 +1, count1 - count1 +1, NULL ) count1 On 11/12/06, Knut Krueger [EMAIL PROTECTED] wrote: I searched the help list and the manual, but I do not find my mistake. Switch is working with character , with integer, but not in the third example Regards Knut count1 - 0 test =c(3,9,3,9,3,9,8,9,8,9,8,9,3,9,3,9,5,9,3,9,1,2,7,9,3,9,1,1,2,2,3,9,2,1,2,5,9,8,9,1,2) count1 - 0 for (i in 1:length(test)) switch (EXPR=test[i], 5 = print(test[i]), 6 = print(test[i]), 7 = print(test[i]), 8 = print(test[i]), 9 = print(test[i]) ) count1 # example from helpfile for(i in c(-1:3,9)) print(switch(i, 1,2,3,4)) # not working test =c(3,9,3,9,3,9,8,9,8,9,8,9,3,9,3,9,5,9,3,9,1,2,7,9,3,9,1,1,2,2,3,9,2,1,2,5,9,8,9,1,2) count1 - 0 for (i in 1:length(test)) switch (EXPR=test[i], 4 = count1 - count1 +1, 5 = count1 - count1 +1, 6 = count1 - count1 +1, 7 = count1 - count1 +1, 8 = count1 - count1 +1 ) count1 __ R-help@stat.math.ethz.ch 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. -- = David Barron Said Business School University of Oxford Park End Street Oxford OX1 1HP __ R-help@stat.math.ethz.ch 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.
Re: [R] Switch and integer
Knut Krueger Knut-krueger at einthal.de writes:
Switch is working with character , with integer, but not in the third
example
...
# not working
test = c(3,9,3,9,3,9,8,9,8,9,8,9,3,9,3,9,5,9,3,9,1,2,7,9,3,9,1,1,
2,2,3,9,2,1,2,5, 9,8,9,1,2)
count1 - 0
for (i in 1:length(test))
switch (EXPR=test[i],
4 = count1 - count1 +1,
5 = count1 - count1 +1,
6 = count1 - count1 +1,
7 = count1 - count1 +1,
8 = count1 - count1 +1
)
count1
switch has a different behavior when an integer is use, which is a bit hidden
in the term corresponding.
If the value of EXPR is an integer between 1 and nargs()-1 then the
corresponding element of ... is evaluated and the result returned.
So something like the example below might come close to what you want.
In each case you have to add the default last item to avoid a NULL.
In the case of no match, if there's a further argument in switch that one
is returned, otherwise NULL.
Dieter
test =c(4,5,8,1,13)
count1 - 0
for (i in 1:length(test)) {
count1 - switch (EXPR=as.character(test[i]),
4 = count1 +1,
5 = count1 +1,
6 = count1 +1,
7 = count1 +1,
8 = count1 +1,
count1
)
}
count1
__
R-help@stat.math.ethz.ch mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] Switch and integer
David Barron schrieb: If the value of EXPR is an integer between 1 and nargs()-1 then the corresponding element of ... is evaluated and the result returned. Thank you, I wondered about the integer between 1 and nargs()-1 and the example from the help file for(i in c(-1:3,9)) print(switch(i, 1,2,3,4)) No see I that the 1,2,3,4 is the output not the value, but it's not very clear for me ho it works. I will try to find it out ... The switch for Integer is very different from C++ or Pascal .. maybe this was the reason for the problem. Regards Knut __ R-help@stat.math.ethz.ch 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.
