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Converting NumPy array into Python List structure?
How do I convert a NumPy array to a Python List (for example [[1,2,3],[4,5,6]] ), and do it reasonably fast?
5 Answers
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Find the max of two or more columns with pandas
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edited Dec 4 '16 at 19:06
alfredocambera
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answer...
LINQ where vs takewhile
...ind all elements matching the condition
var intList = new int[] { 1, 2, 3, 4, 5, -1, -2 };
Console.WriteLine("Where");
foreach (var i in intList.Where(x => x <= 3))
Console.WriteLine(i);
Console.WriteLine("TakeWhile");
foreach (var i in intList.TakeWhile(x => x <= 3))
Console.Wri...
What does the caret operator (^) in Python do?
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edited Mar 16 '10 at 0:40
answered Mar 16 '10 at 0:23
Ch...
Selecting with complex criteria from pandas.DataFrame
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4 Answers
4
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What is the significance of initializing direction arrays below with given values when developing ch
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84
This is a technique to encode all directions as arrays - every pair of di[i],dj[i] is a differen...
How to use the 'sweep' function
...o the 2nd, etc. of the matrix you defined, you will do:
sweep (M, 1, c(1: 4), "+")
I frankly did not understand the definition in the R documentation either, I just learned by looking up examples.
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Create Pandas DataFrame from a string
...StringIO
import pandas as pd
TESTDATA = StringIO("""col1;col2;col3
1;4.4;99
2;4.5;200
3;4.7;65
4;3.2;140
""")
df = pd.read_csv(TESTDATA, sep=";")
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improve this answer
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Append column to pandas dataframe
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45
Or pd.concat([dat1, dat2], axis=1) in this case.
– DSM
Dec 16 '13 at 3:35
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Should I use encoding declaration in Python 3?
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