no,
## I don't see any system in AISMessageFrame
tail(AISMessageFrame)
## MessgeCode
## 95 85E:BR0F0P00032jS2P00DE7P3A00h0
## 96 1349B:3000rCtrn553aR@JHD2d4O
## 97 7933.883509997
## 98 B
Dear friend Richard,
Were you able to obtain the latitude and longitude values with that script?
Thank you so much brother,
Paul
El sáb., 25 de enero de 2020 4:03 p. m., Richard M. Heiberger <
r...@temple.edu> escribió:
> ## from2Comp uses base R functions only
> from2Comp <- function(x, binDi
## from2Comp uses base R functions only
from2Comp <- function(x, binDigits=8) {
## binDigits=8 means 8 significant digits plus a sign bit, thus nchar(x) == 9
tmp <- strtoi(x, base=2)
Neg <- (tmp > (2^binDigits - 1))
tmp[Neg] <- tmp[Neg] - (2^(binDigits + 1))
tmp
}
from2Comp(substr(as.cha
Thanks brother, I really appreciate your help.
Have an awesome weekend!
El vie., 24 de enero de 2020 5:39 p. m., Richard M. Heiberger <
r...@temple.edu> escribió:
> I don't have my computer with me, so I am commenting right now on the
> visual impression of the email.
>
> The latitude shows 90,
I don't have my computer with me, so I am commenting right now on the
visual impression of the email.
The latitude shows 90, 88, ... 2, 89, ...
The labels are lexicographically ordered
-1, -10, -11,...
The latitude binrep look in correct order, and the labels looks like binary
in order.
These th
Dear friend Richard,
Thank you for your interest in helping me through this challenge. As
requested, I am providing the two lat and long frames you suggested, plus
the one single column I am trying to decode:
LatitudeFrame:
> dput(LatitudeFrame)
structure(list(Latitude = structure(c(90L, 88L, 87
now I am even more puzzled.
please complete the following two data.frames and send it to the list.
latDegrees lat2Comp
-90
-89
...
-1
0
1
...
89
90
lonDegrees lon2Comp
-180
-179
...
-91
-90
-89 xxx
Hi Richard,
That was just an example, to show that, for that particular string of
binary numbers, the code works as expected. That is absolutely no related
to the dataset I provided. If I try the function on the dataset, I get
values well over the latitude and longitude boundaries (which should ra
You show the example
> fun("10110010")
[1] -78
as satisfactory. Where in your posted data set do you find the input
string "10110010"?
Please post a set of relevant input strings, and the answers you want from them.
The rest of the columns are not helpful for this specific exercise.
On Fri, Ja
Dear friend Rui,
Hope you are doing great. Firstly, I want to thank you for your super
valuable and kind support of always. As I mentioned in earlier e-mails, I
am trying to decode AIS type messages, and the only ones I am having a real
hard time with, is with latitude and longitude.
I tried the
Hello,
The function I included converts signed binary numbers into their
decimal representation. They are negative if a) they are multiples of 8
bits and b) the most significant bit is a "1". If not just convert to
integer.
As for a) above, I assume that you will have 8 bit numbers. And the
Dear friend Rui,
Hope you are doing great, thanks for your kind feedback. The challenge I
currently have at hand is to decode AIS messages and obtain latitude and
longitude values from those.
So basically, I want to accomplish something like in the example below. I
want to convert this binary num
Sorry, missunderstood the problem.
Here it goes:
fun <- function(x){
res <- sapply(x, function(y){
if(nchar(y) %% 8 != 0 || substr(y, 1, 1) == "0"){
strtoi(y, base = 2)
}else{
y <- unlist(strsplit(y, ""))
-sum((y != "1")*2^((length(y) - 1):0)) - 1
}
})
unname(r
Hello,
Is this what you want?
x <- "10110010"
strtoi(x, base = 2)
#[1] 178
Hope this helps,
Rui Barradas
Às 16:31 de 16/01/20, Paul Bernal escreveu:
Dear friends,
How can I convert the following binary number in two´s complement
representation in R?
10110010
Any help and/or guidance wil
Dear friends,
How can I convert the following binary number in two´s complement
representation in R?
10110010
Any help and/or guidance will be greatly appreciated,
Best regards,
Paul
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