median Questions
29
How do you find the median of a list in Python? The list can be of any size and the numbers are not guaranteed to be in any particular order.
If the list contains an even number of elements, the f...
2
Solved
It seems like there is no native function for that purpose in Presto SQL. Do you know any way to efficiently aggregate a group and return its median?
Arbutus asked 23/9, 2020 at 14:41
5
Use the PRNG with seed 4020 (first 3 numbers are -2123524894 961034805 1071375651) to generate 10^10 integers. Print the 10^5th largest element among the numbers generated.
Of course if the problem...
Minnie asked 28/11, 2023 at 7:51
7
Is there a way to calculate the median using the MongoDB aggregation framework?
Spidery asked 8/12, 2013 at 16:57
38
Solved
According to MSDN, Median is not available as an aggregate function in Transact-SQL. However, I would like to find out whether it is possible to create this functionality (using the Create Aggregat...
Litter asked 27/8, 2009 at 18:24
8
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I would like to calculate group quantiles on a Spark dataframe (using PySpark). Either an approximate or exact result would be fine. I prefer a solution that I can use within the context of groupBy...
Aveyron asked 20/10, 2017 at 8:58
9
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How can I find median of an RDD of integers using a distributed method, IPython, and Spark? The RDD is approximately 700,000 elements and therefore too large to collect and find the median.
This qu...
Olnek asked 15/7, 2015 at 14:11
50
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What's the simplest (and hopefully not too slow) way to calculate the median with MySQL? I've used AVG(x) for finding the mean, but I'm having a hard time finding a simple way of calculating the me...
Electrostatics asked 18/8, 2009 at 0:13
3
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I am working with SQL Server 2008
If I have a Table as such:
Code Value
-----------------------
4 240
4 299
4 210
2 NULL
2 3
6 30
6 80
6 10
4 240
2 30
How can I find the median AND group by the...
Arman asked 13/12, 2013 at 12:26
2
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I'm trying to figure out how to calculate the median of an array of randomly generated numbers. I have the array all set up, but I'm having trouble putting together a function for the calcuation.
...
2
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I have read the order statistics to find the k-th smallest (or largest) element in an array of size n in linear time O(n).
There is one step that it needs to find the median of the medians.
Spli...
Fifteen asked 10/7, 2013 at 23:36
4
I am wondering if there is any way to a median of the rows in a data frame. I understand the function rowmeans exists, but I do not believe there is a row median function. I would like to store the...
17
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I've been trying to calculate median but still I've got some mathematical issues I guess as I couldn't get the correct median value and couldn't figure out why. Here's the code;
class StatsCollect...
Mulry asked 25/7, 2017 at 16:54
10
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Possible Duplicate:
Rolling median algorithm in C
Given that integers are read from a data stream. Find median of elements read so far in efficient way.
Solution I have read: We can us...
6
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I'd like to calculate the median value in a numeric row. How can I do that in SQLite 4?
2
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I have a numpy.array with a dimension dim_array. I'm looking forward to obtain a median filter like scipy.signal.medfilt(data, window_len).
This in fact doesn't work with numpy.array may be becau...
12
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How do I calculate the median of an array of numbers using Ruby?
I am a beginner and am struggling with handling the cases of the array being of odd and even length.
4
This question is turned into a Q&A, because I had struggle finding the answer, and think it can be useful for others
I have a JavaScript array of values and need to calculate in JavaScript ...
Tahitian asked 10/2, 2018 at 10:44
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The median of five is sometimes used as an exercise in algorithm design and is known to be computable using only 6 comparisons.
What is the best way to implement this "median of five using 6 compa...
Unbonnet asked 26/1, 2009 at 19:7
4
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I borrowed some code trying to implement a function to calculate the running median for a ton of data. The current one is too slow for me (The tricky part is that I need to exclude all zeros from t...
5
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I have an array that looks like this:
let arr = [1,2,3,4,5,6,7,8,9]
I know you can get min and max by:
let min = arr.min()
let max = arr.max()
But how do you get the median?
5
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I have a python pandas dataframe with several columns and one column has 0 values. I want to replace the 0 values with the median or mean of this column.
data is my dataframe
artist_hotness is th...
3
Is there a way to calculate moving median for an attribute in Spark DataFrame?
I was hoping that it is possible to calculate moving median using a window function (by defining a window using rowsBe...
Juli asked 19/5, 2017 at 4:36
2
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PySpark API provides many aggregate functions except the median. Spark 2 comes with approxQuantile which gives approximate quantiles but exact median is very expensive to calculate. Is there a more...
Southworth asked 3/8, 2016 at 12:19
1
Problem: Show that RANDOMIZED-SELECT never makes a recursive call to a 0-length array.
Hint: Don't assume that the input array is empty, i.e., p>r. Rather, show that if an empty
(sub-)array is e...
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