Tag: Vector
Posts of Tag: Vector
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1. ## Sorting and ordering Vectors lists in python

Sorting Vector lists of X, Y, Z values in Python Hello, can someone please point me in the direction for a slightly complex sorting of a python list - (currently a list not a tuple) I have a list of vectors tha...Learn More
2. ## How to get the address of the std::vector buffer start most elegantly?

I want to use std::vector for dynamically allocating memory. The scenario is: int neededLength = computeLength(); // some logic here // this will allocate the buffer std::vector&lt;TCHAR&gt; buffe...Learn More
3. ## printing indexes of vector to names

I have this vector: labels: [0 5 8 6 1 3 3 2 2 5 5 6 1 1 3 3 1 8 8 3 3 1 1 1 1 5 2 5 1 1 7 3 6 4 3 3 8 1 3 3 5 1 8 8 1 8 7 1 1 8 6] This vector has 51 indexes, each represent one state of US. And I have thi...Learn More
4. ## Efficiently adding or removing elements to a vector or list in R?

I'm implementing an algorithm that involves lots of adding and removing things from sets. In R, this is slow because as far as I know, adding or removing things from a vector is slow, since the entire vector ha...Learn More

6. ## 3D vector field in matplotlib

Is there a way to plot a 3D vector field in matplotlib? I have seen quiver, but it only talks about a "2-D vector field of arrows". Is there a 3D counterpart somewhere? LMGTFY: I figured a documentation for the...Learn More
7. ## How to initialize a vector of pointers

I am working on a C++ program, and I need to initialize a vector of pointers. I know how to initialize a vector, but if someone could show me how to initialize it as a vector filled with pointers that would be ...Learn More
8. ## Keep reference to element of std::vector after erasing prior element

Hiho everibody. Is there a way to create a pointer to an element of a std::vector but keep the pointer pointing on the same element after deleting one at a lower position? E.g.: the vector contains 0,1,2,3,4,5...Learn More
9. ## C++11 Implementing a Move Contructor and Moving a Member Vector

Ok, I will put up the code first, and then ask my question. #include&lt;vector&gt; #include&lt;string&gt; using std::vector; using std::string; class MyStringContainer { public: MyStringCon...Learn More
10. ## How to factor a vector (times it by itself a set number of times)?

How do I factor a vector, so take a vector and multiply by itself a number of times. I tried vec=vector**4 but get: Runtime error (TypeErrorException): unsupported operand type(s) for **: 'Vector3d' and 'in...Learn More
11. ## 3D vector diagram in python - arrow heads not showing properly

This is the plot I get from the code below: aa = np.zeros(len(self.depthrange)) bb = np.zeros(len(self.depthrange)) for i in range(0, self.n): goodin = ~np.isnan(self.u[:, i]) bb[i]...Learn More
12. ## Unboxing boxed value in vector of four tuples

There is a performance issue I am trying to debug as part of a more complicated code. It seems that append function that I am using to create a dynamic, growable vector of (Int,Int,Int,Int) is causing one of th...Learn More