April 18, 2017 at 8:20 pm
Comments posted to this topic are about the item Reassign a variable in R
April 19, 2017 at 6:23 am
Nice, easy question today, thanks Steve
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Space, the final frontier? not any more...
All limits henceforth are self-imposed.
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April 19, 2017 at 9:39 am
"Without worrying about types". That doesn't terrify me in the slightest...
I'm just going to run some quick SQL.Update Ledger
Set Debt = 'Pancakes';
Ahhh, I feel better now. 🙂
Thom~
Excuse my typos and sometimes awful grammar. My fingers work faster than my brain does.
Larnu.uk
April 19, 2017 at 10:00 am
Thank you for this question. If you run the code provided in the answer #3: gc(x); x <- "42 is the best answer"
then the result is also an re-assign the variable x to the value "42 is the best answer".
Try run in R this code:x <- 42
x
cat("The class of variable x is ",class(x),"\n")
x <- "42 is the best answer"
x
cat(" Now the class of variable x becomes ",class(x),"\n")
cat(" Now call the function gc() for the memory management with print the memory usage statistics and re-assign the variable x","\n")
gc(x); x <- "42 is the best answer" # Incorrect argument(x) of the function gc() is ignored.
x
cat(" Now the class of variable x is ",class(x),"\n")
cat(" Now delete the variable x by using the rm() function and re-assign the variable x","\n")
rm(x); x <- 62
x
cat(" Now the class of variable x is chaged to ",class(x),"\n")
Results:
Executing the program....
$Rscript main.r
[1] 42
The class of variable x is numeric
[1] "42 is the best answer"
Now the class of variable x becomes character
Now call the function gc() for the memory management with print the memory usage statistics and re-assign the variable x
used (Mb) gc trigger (Mb) max used (Mb)
Ncells 84024 4.5 350000 18.7 284784 15.3
Vcells 172806 1.4 786432 6.0 558411 4.3
[1] "42 is the best answer"
Now the class of variable x is character
Now delete the variable x by using the rm() function and re-assign the variable x
[1] 62
Now the class of variable x is chaged to numeric
Garbage collection 1 = 0+0+1 (level 2) ...
4.5 Mbytes of cons cells used (24%)
1.4 Mbytes of vectors used (22%)
April 19, 2017 at 3:11 pm
To me it looked pretty straightforward. Thanks, Steve!
April 19, 2017 at 3:58 pm
George Vobr - Wednesday, April 19, 2017 10:00 AMThank you for this question. May be the irony that if you run the code gc(x); x <- "42 is the best answer" it calls the function gc() for the automatic memory management with print the memory usage statistics.
The Argument (x) is ignored. The result is a re-assing the variable x to the value "42 is the best answer".
I like this option the best. No Really!
Jason...AKA CirqueDeSQLeil
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April 19, 2017 at 5:08 pm
George Vobr - Wednesday, April 19, 2017 10:00 AMThank you for this question. If you run the code provided in the answer #3: gc(x); x <- "42 is the best answer"
then the result is also an re-assign the variable x to the value "42 is the best answer".Try run in R this code:
x <- 42
x
cat("The class of variable x is ",class(x),"\n")x <- "42 is the best answer"
x
cat(" Now the class of variable x becomes ",class(x),"\n")cat(" Now call the function gc() for the memory management with print the memory usage statistics and re-assign the variable x","\n")
gc(x); x <- "42 is the best answer" # Incorrect argument(x) of the function gc() is ignored.
x
cat(" Now the class of variable x is ",class(x),"\n")cat(" Now delete the variable x by using the rm() function and re-assign the variable x","\n")
rm(x); x <- 62
x
cat(" Now the class of variable x is chaged to ",class(x),"\n")
Results:Executing the program....
$Rscript main.r
[1] 42
The class of variable x is numeric
[1] "42 is the best answer"
Now the class of variable x becomes character
Now call the function gc() for the memory management with print the memory usage statistics and re-assign the variable x
used (Mb) gc trigger (Mb) max used (Mb)
Ncells 84024 4.5 350000 18.7 284784 15.3
Vcells 172806 1.4 786432 6.0 558411 4.3
[1] "42 is the best answer"
Now the class of variable x is character
Now delete the variable x by using the rm() function and re-assign the variable x
[1] 62
Now the class of variable x is chaged to numeric
Garbage collection 1 = 0+0+1 (level 2) ...
4.5 Mbytes of cons cells used (24%)
1.4 Mbytes of vectors used (22%)
Please be careful about disclosing the correct answer. Your post is linked on the home page and people who did not dare to try to answer the QotD can read it. Not that it means too much, but I am just trying to make the field level.
April 19, 2017 at 5:45 pm
Revenant - Wednesday, April 19, 2017 5:08 PMPlease be careful about disclosing the correct answer. Your post is linked on the home page and people who did not dare to try to answer the QotD can read it. Not that it means too much, but I am just trying to make the field level.
O. K., thanks for the alert. Somehow, I started it up too fast... 😉
April 19, 2017 at 6:03 pm
George Vobr - Wednesday, April 19, 2017 5:45 PMRevenant - Wednesday, April 19, 2017 5:08 PMPlease be careful about disclosing the correct answer. Your post is linked on the home page and people who did not dare to try to answer the QotD can read it. Not that it means too much, but I am just trying to make the field level.
O. K., thanks for the alert. Somehow, I started it up too fast... 😉
Live long and prosper. 😉
May 19, 2017 at 1:52 am
R becoming easy for me...thanks Steve.
“When I hear somebody sigh, ‘Life is hard,’ I am always tempted to ask, ‘Compared to what?’” - Sydney Harris
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