nan Questions
3
Solved
I am reading in a bunch of CSV files (measurement data for water levels over time) to do various analysis and visualizations on them.
Due to various reasons beyond my control, these time series oft...
6
I have a dataframe with ~300K rows and ~40 columns.
I want to find out if any rows contain null values - and put these 'null'-rows into a separate dataframe so that I could explore them easily.
I ...
2
Solved
Why does double.IsNegative(double.NaN) unexpectedly return true whereas double.NaN < 0 returns false as expected?
Overpowering asked 20/5, 2021 at 18:25
4
Solved
I have a dataFrame in pandas and several of the columns have all null values. Is there a built in function which will let me remove those columns?
2
Solved
I want to use numpy.where() to add a column to a pandas.DataFrame. I'd like to use NaN values for the rows where the condition is false (to indicate that these values are "missing").
Cons...
10
Solved
For my unittest, I want to check if two arrays are identical. Reduced example:
a = np.array([1, 2, np.NaN])
b = np.array([1, 2, np.NaN])
if np.all(a==b):
print 'arrays are equal'
This does not w...
Erelia asked 22/5, 2012 at 21:18
3
Solved
I have a data series which looks like this:
print mydf
id_L1
2 NaN
3 NaN
4 NaN
5 NaN
6 NaN
7 NaN
8 NaN
I would like to check if all the values are NaN.
My attempt:
pd.isnull(mydf).all()
Output:
...
4
Solved
How could I randomly introduce NaN values into my dataset for each column taking into account the null values already in my starting data.
I want to have for example 20% of NaN values by col...
5
Solved
Is it possible to set an element of an array to NaN in Python?
Additionally, is it possible to set a variable to +/- infinity? If so, is there any function to check whether a number is infinity or...
8
Solved
I am trying to print or to get list of columns name with missing values. E.g.
data1 data2 data3
1 3 3
2 NaN 5
3 4 NaN
I want to get ['data2', 'data3'].
I wrote following code:
print('\n'.j...
Pervert asked 21/5, 2016 at 18:37
3
Solved
1
Solved
When casting double infinity to float and vice versa, will it still be infinity? Is it the same with NaN?
Drive asked 6/4, 2021 at 13:0
5
Solved
I'm familiar with NaN being "weird" in JavaScript, i.e., NaN === NaN always returns false, as described here. So one should not make === comparisons to check for NaN, but use isNaN(..) in...
Dennis asked 22/3, 2021 at 9:35
1
I have a pandas DataFrame:
df['total_price'].describe()
returns
count 24895.000000
mean 216.377369
std 161.246931
min 0.000000
25% 109.900000
50% 174.000000
75% 273.000000
max 1355.900000
Name: to...
Saying asked 14/11, 2018 at 18:44
3
Solved
My question is related to this one. I have a file named 'test.csv' with 'NA' as a value for region. I want to read this in as 'NA', not 'NaN'. However, there are missing values in other columns in ...
4
Solved
iv'e tried using a for loop to filter out the null and nan values but still the nan value is added to the listview. this is just a part where the calculation is done.
double rs1 = (qz1 * c11) + (a...
4
Solved
For certain columns of df, if 80% of the column is NAN.
What's the simplest code to drop such columns?
0
My colleague was doing some basic experiments with NaN and was puzzled by the behavior on Visual Studio that did not match his expectations. After discussion, it seems that he uncovered a probable ...
Meridethmeridian asked 1/3, 2021 at 10:8
2
Solved
I am trying to write my first neural network to play the game connect four.
Im using Java and deeplearning4j.
I tried to implement a genetic algorithm, but when i train the network for a while, the...
Idiom asked 5/2, 2021 at 1:53
3
Solved
While nan == nan is always False, in many cases people want to treat them as equal, and this is enshrined in pandas.DataFrame.equals:
NaNs in the same location are considered equal.
Of course,...
Institutionalism asked 25/1, 2018 at 22:27
10
Solved
I was just studying OCPJP questions and I found this strange code:
public static void main(String a[]) {
System.out.println(Double.NaN==Double.NaN);
System.out.println(Double.NaN!=Double.NaN);
}...
Jonas asked 11/1, 2012 at 13:2
2
Solved
It is well known that for any variable of floating-point type x != x iff (if and only if) x is NaN (not-a-number). Or inverse version: x == x iff x is not NaN. Then why did WG14 decide to define is...
3
Solved
How can I check whether a float variable is NaN or not? e.g.
math.Log(1.0) // not NaN
math.Log(-1.0) // NaN
3
Solved
I have a table containing some countries and their KPI from the world-banks API. this looks like . As you can see no nan values are present.
However, I need to pivot this table to bring int into ...
Hepplewhite asked 22/9, 2016 at 6:58
3
Solved
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