[R] replacing a value

[Jim Lemon]

Hi Ani,
It seems to work for me:

 a<-c(20, 20, 14.2375646029948, 19.9999999999999, 20, 20, 16.3092078677214,
20, 20, 20, 20, 20, 20, 20, 20, 14.8590932408795, 16.178935255298,
20, 20, 20, 20, 27.6404077886079, 20, 20, 20, 20, 20, 21.9857063037444,
20, 20, 20, 20)
> a==20
[1]  TRUE  TRUE FALSE FALSE  TRUE  TRUE FALSE  TRUE  TRUE  TRUE  TRUE  TRUE
[13]  TRUE  TRUE  TRUE FALSE FALSE  TRUE  TRUE  TRUE  TRUE FALSE  TRUE  TRUE
[25]  TRUE  TRUE  TRUE FALSE  TRUE  TRUE  TRUE  TRUE
> a[a==20]<-0
> a
[1]  0.00000  0.00000 14.23756 20.00000  0.00000  0.00000 16.30921  0.00000
[9]  0.00000  0.00000  0.00000  0.00000  0.00000  0.00000  0.00000 14.85909
[17] 16.17894  0.00000  0.00000  0.00000  0.00000 27.64041  0.00000  0.00000
[25]  0.00000  0.00000  0.00000 21.98571  0.00000  0.00000  0.00000  0.00000

Notice that it didn't make 19.99999999999999 equal to 20, but did
round it up when printing the result. How do you know that it failed?

Jim

On Wed, Apr 6, 2022 at 12:48 PM ani jaya <gaaauul using gmail.com> wrote:
>
> Dear R-Help,
>
> I try to change a specific value here by following these:
>
> https://www.journaldev.com/39695/replace-in-r
> https://stackoverflow.com/questions/5824173/replace-a-value-in-a-data-frame-based-on-a-conditional-if-statement
> https://stackoverflow.com/questions/54615462/how-to-replace-certain-values-in-a-specific-rows-and-columns-with-na-in-r
> ..and many more
>
> however, it is not change anything. I believe it "should" be easy but
> I think I am missing something. I am afraid it is my system that has a
> problem but restarting r is not solve the problem.
> I just want to change 20 to 0 in my data.
>
> > dput(a)
> c(20, 20, 14.2375646029948, 19.9999999999999, 20, 20, 16.3092078677214,
> 20, 20, 20, 20, 20, 20, 20, 20, 14.8590932408795, 16.178935255298,
> 20, 20, 20, 20, 27.6404077886079, 20, 20, 20, 20, 20, 21.9857063037444,
> 20, 20, 20, 20)
>
> what I did:
> a[a==20]<-0 #fail
> a<-replace(a,a==20,0) #fail
> a[which(a==20)]<-0 #fail
>
> > sessionInfo()
> R version 4.1.2 (2021-11-01)
> Platform: x86_64-w64-mingw32/x64 (64-bit)
> Running under: Windows 10 x64 (build 19043)
>
> Matrix products: default
>
> locale:
> [1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252
> [3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C
> [5] LC_TIME=English_United States.1252
> system code page: 949
>
> Best,
> Ani
>
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