Error .. missing value where TRUE/FALSE needed

Question

I have been trying to run this code (below here) and I have gotten that message "Error in if (temp[ii] == 0) { : missing value where TRUE/FALSE needed"...

temp = c(2.15, 3.5, 0, 0, 0, 1.24, 5.42, 6.87)
tm = length(temp)
for (i in 1:tm){
    if (temp[i] == 0) {
        counter3 = 1
        last = temp[i - 1]
        for (ii in i + 1:tm){
            if (temp[ii] == 0) {
                counter3 = counter3 + 1
            }
            if (temp[ii] != 0) {
                nxt = temp[i + counter3]
            }
        }
    }
}

might help if you a) mentioned the language, B) fixed your formatting. — Paul Collingwood, Mar 08 '13 at 16:24
-1 for not searching. This has been answered multiple times on this site, R-help, etc. Next time, search for the error before posting a question, you'll likely answer the question faster yourself. — Joshua Ulrich, Mar 08 '13 at 16:55
this question has been answered at this thread: http://stackoverflow.com/questions/7355187/error-in-if-while-condition-missing-value-where-true-false-needed — pengchy, Jul 04 '16 at 02:27

score 3 · Answer 1 · answered Mar 08 '13 at 16:52

3

Your problem is that temp[ii] is returning NA because ii goes out of bounds:

ii = i + 1:tm     #Your declaration for ii
ii = 1:tm + 1:tm  #Evaluates to

So ii will definitely be larger than tm (and therefore length(temp) at some point.

In order to better understand/debug for loops, consider printing just the indices:

for(i in 1:tm)
{
    print(i)
    for(ii in i + 1:tm)
        print(ii)
}

answered Mar 08 '13 at 16:52

Señor O

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thank you for your answering, but I still get the same message =/ – user2145596 Mar 08 '13 at 16:56
When I run that code I get the right answer for counter3=3 last=3.5 nxt=1.24 What it is all right! the only problem is the message that I have gotten and since Im not familiar with R, it has been hard to fix ! Thank you anyway – user2145596 Mar 08 '13 at 17:14
You're not making much sense. Why is it that you have `for(ii in i+1:tm)` instead of just `for(ii in 1:tm)`? – Señor O Mar 08 '13 at 18:25

score 2 · Answer 2 · answered Mar 08 '13 at 16:40

At a guess I'm going to say that this is in R - if so I'm guessing that this line:

if (temp[i] == 0) (or temp[ii] == 0)

is resulting in an NA, and if conditions must have a TRUE or FALSE value.

Using a debugger if you can, I'd interrogate the value of temp[i] before the if block.

score 1 · Answer 3 · answered Mar 08 '13 at 16:30

Difficult without knowing the language, but i think the issue is that the value in ii can be greater than the length of temp when i is at its upper bound. I'd have expected an index out of range or something similar but, without knowing the language, who knows! Hope you get your problem fixed.

Error .. missing value where TRUE/FALSE needed

3 Answers3

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