# Beginner problem - using mod function to print odd numbers

17 messages
Open this post in threaded view
|

## Beginner problem - using mod function to print odd numbers

 I don't understand. -- 7%%2=1 9%%2=1 11%%2=1 What aren't these numbers printing ? num<-0 for (i in 1:100){   num<-num+i if (num%%2 != 0)   print(num) } [1] 1 [1] 3 [1] 15 [1] 21 [1] 45 [1] 55 [1] 91 [1] 105 [1] 153 [1] 171 [1] 231 [1] 253 [1] 325 [1] 351 [1] 435 [1] 465 [1] 561 [1] 595 [1] 703 [1] 741 [1] 861 [1] 903 [1] 1035 [1] 1081 [1] 1225 [1] 1275 [1] 1431 [1] 1485 [1] 1653 [1] 1711 [1] 1891 [1] 1953 [1] 2145 [1] 2211 [1] 2415 [1] 2485 [1] 2701 [1] 2775 [1] 3003 [1] 3081 [1] 3321 [1] 3403 [1] 3655 [1] 3741 [1] 4005 [1] 4095 [1] 4371 [1] 4465 [1] 4753 [1] 4851 -- Sent from: https://r.789695.n4.nabble.com/R-help-f789696.html______________________________________________ [hidden email] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.
Open this post in threaded view
|

## Re: Beginner problem - using mod function to print odd numbers

 CONTENTS DELETED The author has deleted this message.
Open this post in threaded view
|

## Re: Beginner problem - using mod function to print odd numbers

 CONTENTS DELETED The author has deleted this message.
Open this post in threaded view
|

## Re: Beginner problem - using mod function to print odd numbers

 In reply to this post by nelpar CONTENTS DELETED The author has deleted this message.
Open this post in threaded view
|

## Re: Beginner problem - using mod function to print odd numbers

 In reply to this post by nelpar CONTENTS DELETED The author has deleted this message.
Open this post in threaded view
|

## Re: Beginner problem - using mod function to print odd numbers

 In reply to this post by nelpar Hello, Why not write a function? odd <- function(x, numeric = TRUE){    i <- x %% 2 == 1    if(numeric) x[i] else i } odd(1:100) Hope this helps, Rui Barradas Às 19:17 de 02/06/21, nelpar escreveu: > > I don't understand. -- > > 7%%2=1 > 9%%2=1 > 11%%2=1 > > What aren't these numbers printing ? > > > num<-0 > for (i in 1:100){ >    num<-num+i > if (num%%2 != 0) >    print(num) > } > > > [1] 1 > [1] 3 > [1] 15 > [1] 21 > [1] 45 > [1] 55 > [1] 91 > [1] 105 > [1] 153 > [1] 171 > [1] 231 > [1] 253 > [1] 325 > [1] 351 > [1] 435 > [1] 465 > [1] 561 > [1] 595 > [1] 703 > [1] 741 > [1] 861 > [1] 903 > [1] 1035 > [1] 1081 > [1] 1225 > [1] 1275 > [1] 1431 > [1] 1485 > [1] 1653 > [1] 1711 > [1] 1891 > [1] 1953 > [1] 2145 > [1] 2211 > [1] 2415 > [1] 2485 > [1] 2701 > [1] 2775 > [1] 3003 > [1] 3081 > [1] 3321 > [1] 3403 > [1] 3655 > [1] 3741 > [1] 4005 > [1] 4095 > [1] 4371 > [1] 4465 > [1] 4753 > [1] 4851 > > > > -- > Sent from: https://r.789695.n4.nabble.com/R-help-f789696.html> > ______________________________________________ > [hidden email] mailing list -- To UNSUBSCRIBE and more, see > 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. > ______________________________________________ [hidden email] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.
Open this post in threaded view
|

## Re: Beginner problem - using mod function to print odd numbers

 In reply to this post by Stefan Evert-3 CONTENTS DELETED The author has deleted this message.
Open this post in threaded view
|

## Re: Beginner problem - using mod function to print odd numbers

 CONTENTS DELETED The author has deleted this message.
Open this post in threaded view
|

## Re: Beginner problem - using mod function to print odd numbers

 CONTENTS DELETED The author has deleted this message.
Open this post in threaded view
|

## Re: Beginner problem - using mod function to print odd numbers

 In reply to this post by R help mailing list-2 There is really no need for a loop: num <- 1:100 num[ifelse(num %% 2 == 1, TRUE, FALSE)]  [1]  1  3  5  7  9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 [26] 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99 David L Carlson On Sat, Jun 5, 2021 at 2:05 PM William Michels via R-help <[hidden email]> wrote: > > > i <- 1L; span <- 1:100; result <- NA; > > for (i in span){ > + ifelse(i %% 2 != 0, result[i] <- TRUE, result[i] <- FALSE) > + } > > span[result] >  [1]  1  3  5  7  9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 > 45 47 49 51 53 55 57 > [30] 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99 > > > > HTH, Bill. > > W. Michels, Ph.D. > > > On Sat, Jun 5, 2021 at 12:55 AM Stefan Evert <[hidden email]> wrote: > > > > > > > > I don't understand. -- > > > > > > 7%%2=1 > > > 9%%2=1 > > > 11%%2=1 > > > > > > What aren't these numbers printing ? > > > > > > num<-0 > > > for (i in 1:100){ > > >  num<-num+i > > > if (num%%2 != 0) > > >  print(num) > > > } > > > > Your code tests the numbers > > > >         1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, … > > > > and correctly prints the odd ones among them. > > > > But I suppose that's not what you wanted to do? > > > > ______________________________________________ > > [hidden email] mailing list -- To UNSUBSCRIBE and more, see > > https://urldefense.com/v3/__https://stat.ethz.ch/mailman/listinfo/r-help__;!!KwNVnqRv!Qe700OYnXI-Qe4XYE55MkVqMX3g4Ic4YFx87U-moxnT0xKw7m-rbNqU-EZd5ixk\$> > PLEASE do read the posting guide https://urldefense.com/v3/__http://www.R-project.org/posting-guide.html__;!!KwNVnqRv!Qe700OYnXI-Qe4XYE55MkVqMX3g4Ic4YFx87U-moxnT0xKw7m-rbNqU-fWVQ0xI\$> > and provide commented, minimal, self-contained, reproducible code. > > ______________________________________________ > [hidden email] mailing list -- To UNSUBSCRIBE and more, see > https://urldefense.com/v3/__https://stat.ethz.ch/mailman/listinfo/r-help__;!!KwNVnqRv!Qe700OYnXI-Qe4XYE55MkVqMX3g4Ic4YFx87U-moxnT0xKw7m-rbNqU-EZd5ixk\$> PLEASE do read the posting guide https://urldefense.com/v3/__http://www.R-project.org/posting-guide.html__;!!KwNVnqRv!Qe700OYnXI-Qe4XYE55MkVqMX3g4Ic4YFx87U-moxnT0xKw7m-rbNqU-fWVQ0xI\$> and provide commented, minimal, self-contained, reproducible code. ______________________________________________ [hidden email] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.
Open this post in threaded view
|

## Re: Beginner problem - using mod function to print odd numbers

 If the loop is necessary: num <- vector() for (i in 1:100) {     if(i %% 2 != 0) num <- c(num, i) } num Or modify your code to this to get each odd number printed on a separate row: for (i in 1:100) {     if(i %% 2 != 0) print(i) } David L Carlson On Sun, Jun 6, 2021 at 3:21 PM David Carlson <[hidden email]> wrote: > > There is really no need for a loop: > > num <- 1:100 > num[ifelse(num %% 2 == 1, TRUE, FALSE)] > >  [1]  1  3  5  7  9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 > [26] 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99 > > David L Carlson > > > On Sat, Jun 5, 2021 at 2:05 PM William Michels via R-help > <[hidden email]> wrote: > > > > > i <- 1L; span <- 1:100; result <- NA; > > > for (i in span){ > > + ifelse(i %% 2 != 0, result[i] <- TRUE, result[i] <- FALSE) > > + } > > > span[result] > >  [1]  1  3  5  7  9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 > > 45 47 49 51 53 55 57 > > [30] 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99 > > > > > > > HTH, Bill. > > > > W. Michels, Ph.D. > > > > > > On Sat, Jun 5, 2021 at 12:55 AM Stefan Evert <[hidden email]> wrote: > > > > > > > > > > > I don't understand. -- > > > > > > > > 7%%2=1 > > > > 9%%2=1 > > > > 11%%2=1 > > > > > > > > What aren't these numbers printing ? > > > > > > > > num<-0 > > > > for (i in 1:100){ > > > >  num<-num+i > > > > if (num%%2 != 0) > > > >  print(num) > > > > } > > > > > > Your code tests the numbers > > > > > >         1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, … > > > > > > and correctly prints the odd ones among them. > > > > > > But I suppose that's not what you wanted to do? > > > > > > ______________________________________________ > > > [hidden email] mailing list -- To UNSUBSCRIBE and more, see > > > https://urldefense.com/v3/__https://stat.ethz.ch/mailman/listinfo/r-help__;!!KwNVnqRv!Qe700OYnXI-Qe4XYE55MkVqMX3g4Ic4YFx87U-moxnT0xKw7m-rbNqU-EZd5ixk\$> > > PLEASE do read the posting guide https://urldefense.com/v3/__http://www.R-project.org/posting-guide.html__;!!KwNVnqRv!Qe700OYnXI-Qe4XYE55MkVqMX3g4Ic4YFx87U-moxnT0xKw7m-rbNqU-fWVQ0xI\$> > > and provide commented, minimal, self-contained, reproducible code. > > > > ______________________________________________ > > [hidden email] mailing list -- To UNSUBSCRIBE and more, see > > https://urldefense.com/v3/__https://stat.ethz.ch/mailman/listinfo/r-help__;!!KwNVnqRv!Qe700OYnXI-Qe4XYE55MkVqMX3g4Ic4YFx87U-moxnT0xKw7m-rbNqU-EZd5ixk\$> > PLEASE do read the posting guide https://urldefense.com/v3/__http://www.R-project.org/posting-guide.html__;!!KwNVnqRv!Qe700OYnXI-Qe4XYE55MkVqMX3g4Ic4YFx87U-moxnT0xKw7m-rbNqU-fWVQ0xI\$> > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ [hidden email] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.
Open this post in threaded view
|

## Re: Beginner problem - using mod function to print odd numbers

 In reply to this post by R help mailing list-2 CONTENTS DELETED The author has deleted this message.
Open this post in threaded view
|

## Re: Beginner problem - using mod function to print odd numbers

 In reply to this post by Bert Gunter-2 CONTENTS DELETED The author has deleted this message.
Open this post in threaded view
|

## Re: Beginner problem - using mod function to print odd numbers

 In reply to this post by David Carlson CONTENTS DELETED The author has deleted this message.
Open this post in threaded view
|

## Re: Beginner problem - using mod function to print odd numbers

 CONTENTS DELETED The author has deleted this message.