Hi There,
I'm facing one problem to construct a vector using the "for" command:
I have one matrix named 'dados' (same as /data/ from portuguese), for
example:
> dados[140:150,]
[,1] [,2] [,3]
[1,] 212.7298 0.14 0.11
[2,] 213.3778 0.14 0.11
[3,] 214.0257 0.15 0.11
[4,] 214.6737 0.15 0.12
[5,] 215.3217 0.15 0.12
[6,] 215.9696 0.15 0.12
[7,] 216.6176 0.16 0.12
[8,] 217.2656 0.16 0.13
[9,] 217.9135 0.16 0.13
[10,] 218.5615 0.16 0.13
[11,] 219.2094 0.17 0.13
So, I need one vector getting the values from the third column given
specific values of the second:
s <- seq(0,1,0.05)
r <- NULL
for (w in 1:length(s)){
r[w] <- dados[,3][dados[,2]==s[w]][1]
}
This vector 'r' are working well to many values, but there are some
inconsistency (NA's) for others:
> r
[1] 0.00 0.03 0.07 NA 0.16 0.21 NA NA 0.36 0.41 0.46 0.52 NA 0.63
NA
[16] 0.74 0.79 NA 0.90 NA 1.00
and dissecting this:
> s[4]
[1] 0.15
> dados[,3][dados[,2]==0.15][1]
[1] 0.11
> dados[,3][dados[,2]==s[4]][1]
[1] NA
> s[4]==0.15
[1] FALSE
> s[5]==0.20
[1] TRUE
> dados[,3][dados[,2]==s[5]][1]
[1] 0.16
Anyone could help me to discover why this is occorring?
dados[,2] and dados[,3] came from rounded values. Could this fact interfere
the results?
Thanks in advance.
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