Naresh,
I think your details suggest your earlier request was not well defined.
Your problem looks like this line of code was wrong and did something you did
not expect. It should be easy to fix. But I note you changed Prices to use the
data.table package. Mind you, I thought the function was lower case setDT and
you mention SetDT. At this point, I cannot help you as I do not know enough
about the package.
As a general rule, the best way to ask for help includes mentioning the
packages you used. The code snippet did not have a library() statement that
would be needed.
Here is the original:
Prices[, date = as.Date(date)]
I cannot speak for how data.table might parse that. In base R, it would not
work and I can suggest what would.
What you wanted to do was convert a column containing a date in some format
into a date in some other format. Am I right? In particular, I am guessing the
date returned by SQL into the Prices data.frame is there as text in a standard
format. If not, you may need to convert the date some more specific way.
Here is a way outside data.table that might work within it as well.
Prices$date <- as.Date(Prices$date)
The above replaces the contents of one vector/column and note the suggested use
is not of “=” which gave you a side-effect, but to use “<-“ in the R-thritic
way.
There are other variations and yet more if using the dplyr or other packages,
but the above is fairly simple and straightforward and uses base R.
I will spare you further explanations and lecturing on what I thought your code
would do as I looked again and realize it is not a standard data.frame anymore.
Here is a test case if your date is in this format:
Prices <- data.frame(date=c("2025-01-01", "2025-01-26"),
price=c(12, 14),
stock=c("AAPL", "MSFT"))
Prices$date <- as.Date(Prices$date)
The result is:
> Prices
date price stock
1 2025-01-01 12 AAPL
2 2025-01-26 14 MSFT
If your date is in some other format, you have to specify the format. See the
help on as.Date to see how to set the format=option.
If anyone wants to explain better on the data.table method and maybe explain
what went wrong, I would be happy to hear it, as well as any corrections on
what I wrote.
From: Naresh Gurbuxani <naresh_gurbux...@hotmail.com>
Sent: Tuesday, January 28, 2025 1:56 PM
To: John Sorkin <jsor...@som.umaryland.edu>
Cc: avi.e.gr...@gmail.com; r-help@r-project.org
Subject: Re: [R] R CMD check says no visible binding for global variable
Data.frame is returned by SQL query. It does have column names. In the
function, I make small changes to some columns.
Something like:
Myquery <- “SELECT date, price, stock FROM stocktab WHERE stock = ‘ABC’ AND
date > ‘2025-01-01’;”
Prices <- dbGetQuery(con, myquery)
SetDT(Prices)
Prices[, date = as.Date(date)]
R CMD check say “no visible binding for global variable ‘date’”
Sent from my iPhone
On Jan 28, 2025, at 1:24 AM, Sorkin, John <jsor...@som.umaryland.edu
<mailto:jsor...@som.umaryland.edu> > wrote:
There you go, once again helping strengthen ;)
John
Get Outlook for iOS <https://aka.ms/o0ukef>
_____
From: R-help <r-help-boun...@r-project.org
<mailto:r-help-boun...@r-project.org> > on behalf of avi.e.gr...@gmail.com
<mailto:avi.e.gr...@gmail.com> <avi.e.gr...@gmail.com
<mailto:avi.e.gr...@gmail.com> >
Sent: Tuesday, January 28, 2025 12:01:25 AM
To: 'Naresh Gurbuxani' <naresh_gurbux...@hotmail.com
<mailto:naresh_gurbux...@hotmail.com> >; r-help@r-project.org
<mailto:r-help@r-project.org> <r-help@r-project.org
<mailto:r-help@r-project.org> >
Subject: Re: [R] R CMD check says no visible binding for global variable
Naresh,
I am not sure how you are creating your data.frame so it has no, I think,
column names. There are two scenarios including one where it is not really a
valid data.frame and one where it can be handled before any other use as shown
below. If it cannot be used, you might need to modify how your SQL or the
function you call creates it so it includes either names it chooses or that you
supply.
One silly solution if to give your data frame names before using it later. In
prticulr, if you know what the columns contain, you can choose suitable names
like this if you have exactly three columns:
> colnames(mydata) <- c("first", "second", "third")
> mydata
first second third
1 1 2 3
If you have a varying number of columns and don't care what the names are, you
can make n names that look like temp1, temp2, ... tempn like this:
> paste0("temp", 1:ncol(mydata))
[1] "temp1" "temp2" "temp3"
Obviously, you substitute in whatever your data.frame is called.
So the code to add names for columns looks like:
> colnames(mydata) <- paste0("temp", 1:ncol(mydata))
> mydata
temp1 temp2 temp3
1 1 2 3
-----Original Message-----
From: R-help <r-help-boun...@r-project.org
<mailto:r-help-boun...@r-project.org> > On Behalf Of Naresh Gurbuxani
Sent: Monday, January 27, 2025 5:46 PM
To: r-help@r-project.org <mailto:r-help@r-project.org>
Subject: [R] R CMD check says no visible binding for global variable
I have written a function which returns an SQL query result as a data.frame.
Each column of data.frame is a variable not explicitly defined.
For every column name, R CMD check says ‘no visible binding for global variable
<name>. Status: 1 NOTE
Is it possible to tell R CMD check that these variables are OK?
Thanks,
Naresh
Sent from my iPhone
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