If your row length is a compile time constant, C++11 allows See this answer. Compilers like gcc that allow variable-length arrays as an extension to C++ can use new as shown here to get fully runtime-variable array dimension functionality like C99 allows, but portable ISO C++ is limited to only the first dimension being variable. Another efficient option is … Read more
When I try the result gives me a 2-d plot frame with x-axis from 0 to 1. However, when I try using numpy.newaxis to slice a vector, Is it the same thing except that it changes a row vector to a column vector? Generally, what is the use of numpy.newaxis, and in which circumstances should … Read more
The purpose of meshgrid is to create a rectangular grid out of an array of x values and an array of y values. So, for example, if we want to create a grid where we have a point at each integer value between 0 and 4 in both the x and y directions. To create … Read more
Given a list of lists t, which means: is faster than the shortcuts posted so far. (t is the list to flatten.) Here is the corresponding function: As evidence, you can use the timeit module in the standard library: Explanation: the shortcuts based on + (including the implied use in sum) are, of necessity, O(T**2) when there are T sublists — as the intermediate … Read more