Adding a counter to a loop

Question

On a broad question that I haven't been able to find for R:

I'm trying to add a counter at the beginning of a loop. So that when I run the loop sim = 1000:

if(hours$week1 > 1 and hours$week1 < 48) add 1 to the counter 
ifelse add 0

I have came across counter tutorials that print a sentence to let you know where you are (if something goes wrong): e.g

For (i in 1:1000) {
    if (i%%100==0) print(paste("No work", i)) 
}

But the purpose of my counter is to generate a value output, measuring how many of the 1000 runs in the loop fall inside a specified range.

Try to give a reproducible example along with the expected output. — Ronak Shah
– Ronak Shah, Commented Dec 8, 2017 at 2:03
What is the problem with using your second suggested loop, and just maintaining a counter declared outside the loop? — Tim Biegeleisen
– Tim Biegeleisen, Commented Dec 8, 2017 at 2:04

Gregor Thomas · Accepted Answer · 2017-12-08 05:22:36Z

3

You basically had it. You just need to a) initialize the counter before the loop, b) use & instead of and in your if condition, c) actually add 1 to the counter. Since adding 0 is the same as doing nothing, you don't have to worry about the "else".

counter = 0
for (blah in your_loop_definition) {
    ... loop code ...
    if(hours$week1 > 1 & hours$week1 < 48) {
        counter = counter + 1
    }
    ... more loop code ...
}

answered Dec 8, 2017 at 5:22

Gregor Thomas

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Comments

sigbert · Accepted Answer · 2019-01-11 08:23:29Z

1

Instead of

if(hours$week1 > 1 & hours$week1 < 48) {
    counter = counter + 1
}

you could also use

counter = counter + (hours$week1 > 1 && hours$week1 < 48)

since R is converting TRUE to 1 and FALSE to 0.

answered Jan 11, 2019 at 8:23

sigbert

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Comments

ardaar · Accepted Answer · 2017-12-08 02:29:18Z

0

How about this?

count = 0

for (i in 1:1000) {

  count = ifelse(i %in% 1:100, count + 1, count)

}

count

#> [1] 100

answered Dec 8, 2017 at 2:29

ardaar

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Comments

ostermann · Accepted Answer · 2019-08-17 18:32:35Z

0

If your goal is just to monitor progression coarsely, and you're using Rstudio, a simple solution is to just refresh the environment tab to check the current value of i.

answered Aug 17, 2019 at 18:32

ostermann

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