nan Questions
3
Solved
I'm trying to remove NaN values from a dataframe (without removing the entire column or row) and shift the next value to the prior column.
Example:
CLIENT| ANIMAL_1 | ANIMAL_2 | ANIMAL_3| ANIMAL_4...
1
7
I have a DataFrame with many missing values in columns which I wish to groupby:
import pandas as pd
import numpy as np
df = pd.DataFrame({'a': ['1', '2', '3'], 'b': ['4', np.NaN, '6']})
In [4]: df...
2
Solved
Let's take this dataframe as a simple example:
df = pd.DataFrame(dict(Col1=[np.nan,1,1,2,3,8,7], Col2=[1,1,np.nan,np.nan,3,np.nan,4], Col3=[1,1,np.nan,5,1,1,np.nan]))
Col1 Col2 Col3
0 NaN 1.0 1....
2
EDIT: I already made significant progress. My current question is written after my last edit below and can be answered without the context.
I currently follow Andrew Ng's Machine Learning Course ...
Fragonard asked 17/8, 2018 at 15:25
1
Solved
My code sometimes produces a list of nan's op_list = [nan, nan, nan, nan, nan, nan, nan, nan, nan, nan].
I want to know if all elements are nans.
My code and present output:
op_list = [n...
18
Solved
Is it possible somehow to return 0 instead of NaN when parsing values in JavaScript?
In case of the empty string parseInt returns NaN.
Is it possible to do something like that in JavaScript to ch...
Kismet asked 18/7, 2011 at 16:58
3
Solved
I am dealing with pandas DataFrames like this:
id x
0 1 10
1 1 20
2 2 100
3 2 200
4 1 NaN
5 2 NaN
6 1 300
7 1 NaN
I would like to replace each NAN 'x' with the previous non-NAN 'x' from a row w...
Autonomy asked 2/5, 2013 at 18:51
1
Solved
For the function I am writing I would like to return a Nan if the input doesn't make sense.
How can I insert a NaN into an xmm register the easiest way?
3
Solved
I have difficulties to understand how to correctly use HandleScope and EscapableHandleScope. For example, from this Node example:
MyObject::MyObject(const Napi::CallbackInfo& info) : Napi::Obj...
Rave asked 14/1, 2019 at 19:1
4
Solved
I am reading two columns of a csv file using pandas readcsv() and then assigning the values to a dictionary. The columns contain strings of numbers and letters. Occasionally there are cases where a...
9
Solved
float f = (float)'a';
if(f < 0){
}
else if(f == 0){
}
else if(f > 0){
}
else{
printf("NaN\n");
}
f won't be greater/equal/less than 0 if it's a NaN.
But how to produce such a f in...
Annemarie asked 27/8, 2011 at 3:24
3
Solved
My shapefile has some missing values (represented by nan) on certain columns (for example, GDP). When plotting without dealing with those missing values, the legend shows like this:
which is not w...
8
Solved
Assignment a number to an attribute using the += operator gives me NaN in JavaScript.
This code works as expected:
> var result = {};
undefined
> result['value'] = 10;
10
> result['value...
Gamelan asked 6/2, 2015 at 14:17
2
I'm using Gson, ran into a problem serializing an object:
java.lang.IllegalArgumentException: NaN is not a valid double
value as per JSON specification. To override this behavior,
use GsonBuild...
4
long story short, i was trying to validate a phone field. ive added
the isNaN and parseInt for checking the " " in the field but that said
This below never validates to true..what am i missing?
i...
Extreme asked 17/4, 2012 at 2:40
4
Solved
I still do not understand what a NaN or a (Number which isn´t a real Number) exactly is.
Main question:
What is a NaN value or NaN exactly (in the words of a non-math professor)?
Furthe...
Bainter asked 14/12, 2019 at 12:18
4
Solved
Is there a numerically stable way to compute softmax function below?
I am getting values that becomes Nans in Neural network code.
np.exp(x)/np.sum(np.exp(y))
Fountainhead asked 4/3, 2017 at 18:11
5
Solved
That is the difference between groupby("x").count and groupby("x").size in pandas ?
Does size just exclude nil ?
Endoskeleton asked 26/10, 2015 at 13:8
3
I am trying to replace the nan values in a dataframe column 'Functional' using fillna() function. The issues I am facing are below:
I am able to detect the null values using the isnull()
dfcomp[d...
6
Solved
What's the difference between NaN and Infinity? When does NaN appear? What is it?
Cabman asked 13/11, 2011 at 15:18
4
Solved
I'm having a bit of trouble with this. My dataframe looks like this:
id amount dummy
1 130 0
1 120 0
1 110 1
1 nan nan
1 nan nan
2 nan 0
2 50 0
2 20 1
2 nan nan
2 nan nan
So, what I need to ...
4
Solved
>>> (float('inf')+0j)*1
(inf+nanj)
Why? This caused a nasty bug in my code.
Why isn't 1 the multiplicative identity, giving (inf + 0j)?
2
Solved
I am using pandas read_sql_query to read data from a MySQL database table into a pandas dataframe. Some columns in this table have all NULL values. For those columns the pandas dataframe contains N...
Howlond asked 15/11, 2018 at 8:18
2
Solved
I have a data frame with multi-index columns.
From this data frame I need to remove the rows with NaN values in a subset of columns.
I am trying to use the subset option of pd.dropna but I do n...
Helgoland asked 11/9, 2019 at 10:26
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