Questions tagged [isnan]
26 questions
2
votes
1 answer
Why does std::isnan( IntegralType arg ) cast arg to double?
An integral type cannot be NaN from my understanding, so std::isnan can just return false when given an integral type. Why does arg need to be cast to double as it states here
David
- 619
- 2
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2
votes
2 answers
Why does `gcc -ffast-math` disable the correct result of `isnan()` and `isinf()`?
I understand that using the -ffast-math flag allows for unsafe math operations and disables signalling NaNs. However, I expected the functions isnan() and isinf() to still be able to return the correct results, which they do not.
Here's an…
mivkov
- 471
- 5
- 19
2
votes
1 answer
Does GCC's __builtin_isnan do something other than isnan?
In the GCC built-ins description, it says:
GCC provides built-in versions of the ISO C99 floating-point comparison macros that avoid raising exceptions for unordered operands. They have the same names as the standard macros ( isgreater,…
einpoklum
- 118,144
- 57
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- 684
1
vote
2 answers
What is the proper way to compare equality of two variables that could be NaN?
I found a bug in the codebase I'm working in where they check for equality of two doubles (first, second) using first == second, but these 2 variables could be NaN.
If both variables were NaN the equality would be false.
So my current solution is…
roulette01
- 1,984
- 2
- 13
- 26
1
vote
0 answers
Geopandas GeoDataFrame.boundary raises null value error even if .is_empty returns False
I have a geopandas dataframe with an id column and a 'geometry' column. I am calling "boundary" onto the geometry column like so:
gdf_ops['start_end_points'] = gdf_ops['geometry'].boundary
But this raises a Value error:
ValueError: Null/empty…
Carmoldu
- 11
- 2
0
votes
2 answers
Convert NA to 0
my data (typeof S4) is look like:
> rowData(ds_res1$res)
DataFrame with 144 rows and 4 columns
cluster_id marker_id p_val p_adj
…
Charlt
- 17
- 9
0
votes
1 answer
while multiplying two number and storing into that number ends up with a result of NaN
while iam using the += operator the multiplication results in NaN
convertToDecimal(){
let current=this.head;
let size=this.size;
size-=1;
var result;
while(current!=null){
…
ABIN
- 29
- 5
0
votes
0 answers
MissingDataError: exog contains inf or nans
i am a little bit lost ...because i have this error and can not go ahead.
i supposed the reason will be the below resul of my table that include some math indicator i have tri to calculate.
null_values=data.isna().sum()
print(null_values)
output…
ire
- 11
- 3
0
votes
3 answers
Parsing function returns NaN instead of zero as requested
I've got these functions:
const precisionRound = (number, precision = 0) => {
const factor = 10 ** precision;
return Math.round(number * factor) / factor;
};
const superParseFloat = (numberish, precision = 2) => {
if (!!numberish) {
…
dariusz
- 441
- 1
- 5
- 17
0
votes
1 answer
IsNaN shows other results
let args: string[] = process.argv.slice(2);
console.log(`All arguments: ${args}`);
let numbers: number[] = saveNumbers();
console.log(`All Numbers: ${numbers}`);
console.log(`1st argument < 10: ${firstNumberFullfill(numbers,x => x <…
Yanis
- 5
- 2
0
votes
0 answers
How to write a code that finds difference between adjacent, nonNaN values in a 3d array
Essentially,I have 4 arrays in a data file. They are: theta (276 x 626 x 2677 double); dates (1 x 2677 date time); latitude (276 x 626 double); and longitude (276 x 626 double). I am basically trying to find d(theta)/dt.
I'm working in MATLAB and…
Hannah
- 11
- 3
0
votes
1 answer
user_na = FALSE does not make all empty rows NA - only for some columns when reading using read_sav
I use
df <- read_sav("data/file.sav", user_na = FALSE)
But the data does not look like expected
col1 col2
1 Onestreet
2 Twostreet
NA
4
5
How come rows 3-5 not become NA in col2?
Victor Nielsen
- 443
- 2
- 14
0
votes
0 answers
C++ isnan() won't work in an if-statement?
I am trying to check, if a variable is not a number. I tried to use std::isnan() for that.
Here's the code that I thought would work:
#include
#include
#include
int main()
{
int num = 1;
if (std::isnan(num))
…
Tobi Smith
- 53
- 2
- 9
0
votes
1 answer
ifelse, is.na and replace
I have a big data frame where I am trying to figure out with NA values
q3
times_30
Very easy
18/11/2021
Easy
01/01/2021
NA
Not due
NA
No answer
NA
01/02/2021
I am using
df$q3<-ifelse (is.na(df$q3), df$times_30,df$q3)
Where gives…
Meli
- 33
- 6
0
votes
0 answers
How can I get 'return True' by exponent in JavaScript?
First, I'm sorry I can't speak English well.
I have some problems studying JS. I want to return true if the string is a Number.
If string is "0x10", "0b10", "9843" it work well (all return true).
And string like "a463" return false well.
But, when…
Bam
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