r – Error in if/while (condition) {: missing Value where TRUE/FALSE needed

r – Error in if/while (condition) {: missing Value where TRUE/FALSE needed

The evaluation of condition resulted in an NA. The if conditional must have either a TRUE or FALSE result.

n

if (NA) {}n## Error in if (NA) { : missing value where TRUE/FALSE neededn

n

This can happen accidentally as the results of calculations:

n

if(TRUE && sqrt(-1)) {}n## Error in if (TRUE && sqrt(-1)) { : missing value where TRUE/FALSE neededn

n


n

To test whether an object is missing use is.na(x) rather than x == NA.

n


n

See also the related errors:

n

Error in if/while (condition) { : argument is of length zero

n

Error in if/while (condition) : argument is not interpretable as logical

n

if (NULL) {}n## Error in if (NULL) { : argument is of length zeronnif (not logical) {}n## Error: argument is not interpretable as logicalnnif (c(TRUE, FALSE)) {}n## Warning message:n## the condition has length > 1 and only the first element will be usedn

I ran into this when checking on a null or empty string

n

if (x == NULL || x == ) {n

n

changed it to

n

if (is.null(x) || x == ) {n

r – Error in if/while (condition) {: missing Value where TRUE/FALSE needed

this works with NA not for NA

n

comments = c(no,yes,NA)n  for (l in 1:length(comments)) {n    #if (!is.na(comments[l])) print(comments[l])n    if (comments[l] != NA) print(comments[l])n  }n

Leave a Reply

Your email address will not be published.