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Generate a heatmap in MatPlotLib using a scatter data set
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If you don't want hexagons, you can use numpy's histogram2d function:
import numpy as np
import numpy.random
import matplotlib.pyplot as plt
# Generate some test data
x = np.random.randn(8873)
y = np.random.randn(8873)
heatmap, xedges, yedges =...
Cluster analysis in R: determine the optimal number of clusters
Being a newbie in R, I'm not very sure how to choose the best number of clusters to do a k-means analysis. After plotting a subset of below data, how many clusters will be appropriate? How can I perform cluster dendro analysis?
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Why use ICollection and not IEnumerable or List on many-many/one-many relationships?
I see this a lot in tutorials, with navigation properties as ICollection<T> .
9 Answers
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Checkout subdirectories in Git?
Is it possible to check out subdirectories of a repository in Git?
9 Answers
9
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What does collation mean?
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Collation can be simply thought of as sort order.
In English (and it's strange cousin, American), collation may be a pretty simple matter consisting of ordering by the ASCII code.
Once you get into those strange European languages with all their accen...
PHP Regex to check date is in YYYY-MM-DD format
I'm trying to check that dates entered by end users are in the YYYY-MM-DD. Regex has never been my strong point, I keep getting a false return value for the preg_match() I have setup.
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Convert datetime object to a String of date only in Python
I see a lot on converting a date string to an datetime object in Python, but I want to go the other way.
I've got
11 A...
Foreign Key to multiple tables
I've got 3 relevant tables in my database.
5 Answers
5
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Serialize an object to XML
...izer(typeof(MyObject));
var subReq = new MyObject();
var xml = "";
using(var sww = new StringWriter())
{
using(XmlWriter writer = XmlWriter.Create(sww))
{
xsSubmit.Serialize(writer, subReq);
xml = sww.ToString(); // Your XML
}
}
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Change Oracle port from port 8080
How do I change Oracle from port 8080? My Eclipse is using 8080, so I can't use that.
8 Answers
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