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Principal component analysis in Python
....dinv: 1/d or 0, see NR
p.eigen: the eigenvalues of A*A, in decreasing order (p.d**2).
eigen[j] / eigen.sum() is variable j's fraction of the total variance;
look at the first few eigen[] to see how many PCs get to 90 %, 95 % ...
p.npc: number of principal components,
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Reference: What is variable scope, which variables are accessible from where and what are “undefined
...sent; an administrator can disable some or all of them using the variables_order directive in php.ini, but this is not common behaviour.
A list of current superglobals:
$GLOBALS - All the global variables in the current script
$_SERVER - Information on the server and execution environment
$_GET...
Decimal precision and scale in EF Code First
....Property(product => product.Price),
modelBuilder.Entity<Order>().Property(order => order.OrderTotal),
modelBuilder.Entity<OrderDetail>().Property(detail => detail.Total),
modelBuilder.Entity<Option>().Property(option => option.Price)...
How to use count and group by at the same select statement
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If you want to order by count (sound simple but i can`t found an answer on stack of how to do that) you can do:
SELECT town, count(town) as total FROM user
GROUP BY town ORDER BY total DESC
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Python logging not outputting anything
...a handler with level=DEBUG, the actual logging level must also be DEBUG in order to get it to output anything.
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PostgreSQL: Show tables in PostgreSQL
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psql my_db_name should be run in order \dt to work. When I ran psql without a database name, I got a "No relations found" message
– Maksim Dmitriev
Nov 19 '13 at 15:01
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How to remove convexity defects in a Sudoku square?
... grid:
mask = FillingTransform[largestComponent]
Now, I can use a 2nd order derivative filter to find the vertical and horizontal lines in two separate images:
lY = ImageMultiply[MorphologicalBinarize[GaussianFilter[srcAdjusted, 3, {2, 0}], {0.02, 0.05}], mask];
lX = ImageMultiply[Morphologica...
Why is no one using make for Java?
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So in order to use make in a huge Java project, it would be necessary to maintain a list of all changed .java files and then call javac at the end? That sounds less than ideal to me. That's the best answer that I've seen so far.
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Why can't non-default arguments follow default arguments?
...wed. A SyntaxError is raised if the arguments are not given in the correct order:
Let us take a look at keyword arguments, using your function.
def fun1(a="who is you", b="True", x, y):
... print a,b,x,y
Suppose its allowed to declare function as above,
Then with the above declarations, we c...
Popstate on page's load in Chrome
... calls to update some results on the page and use history.pushState() in order to update the browser's location bar without page reload. Then, of course, I use window.popstate in order to restore previous state when back-button is clicked.
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