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Slicing of a NumPy 2d array, or how do I extract an mxm submatrix from an nxn array (n>m)?
...he values x[0,1] and x[2,3] in an array.
There is a helpful function for doing the first example I gave, numpy.ix_. You can do the same thing as my first example with x[numpy.ix_([0,2],[1,3])]. This can save you from having to enter in all of those extra brackets.
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Which, if any, C++ compilers do tail-recursion optimization?
It seems to me that it would work perfectly well to do tail-recursion optimization in both C and C++, yet while debugging I never seem to see a frame stack that indicates this optimization. That is kind of good, because the stack tells me how deep the recursion is. However, the optimization would be...
What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it?
What does ArrayIndexOutOfBoundsException mean and how do I get rid of it?
25 Answers
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How do I remove an item from a stl vector with a certain value?
I was looking at the API documentation for stl vector, and noticed there was no method on the vector class that allowed the removal of an element with a certain value. This seems like a common operation, and it seems odd that there's no built in way to do this.
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How do search engines deal with AngularJS applications?
...ere.
If this is an option I'd recommend reading this article about how to do SEO for Angular with server-side rendering.
I’m not sure what the crawler does when it encounters custom tags.
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How do you check “if not null” with Eloquent?
How do you check if a field is not null with Eloquent?
7 Answers
7
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What is the best way to do GUIs in Clojure?
What is the best way to do GUIs in Clojure ?
16 Answers
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How do I copy a hash in Ruby?
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The clone method is Ruby's standard, built-in way to do a shallow-copy:
irb(main):003:0> h0 = {"John" => "Adams", "Thomas" => "Jefferson"}
=> {"John"=>"Adams", "Thomas"=>"Jefferson"}
irb(main):004:0> h1 = h0.clone
=> {"John"=>"Adams", "Thomas"=>"J...
Read and write a String from text file
...ading and writing you should use a location that is writeable, for example documents directory. The following code shows how to read and write a simple string. You can test it on a playground.
Swift 3.x - 5.x
let file = "file.txt" //this is the file. we will write to and read from it
let text = "...
Copy tables from one database to another in SQL Server
...a and all) to database bar from database foo. What is the SQL statement to do this?
9 Answers
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