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Mastering Development

C++ / same code produces slower performance

I wrote a function to parse a list of integers in order to remove all values in a given interval [u,u+15]. Calls to this function represent 60% of my execution time, so I tried to optimize it. The list is limited to 30 elements and it is unique so I choose a static array where […]

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Mastering Development

How to get individual stats from a sports dataset of matches in pandas (convert list of lists to dictionary?)?

I have a CSV dataset of tennis match results in winner, loser format that has similar structure to this one: https://www.kaggle.com/jordangoblet/atp-tour-20002016 I want to create another table that will show number of wins, losses, days since last match, average serve percentage etc. per player. A friend suggested trying something like this: games = [ [“Elliot”, […]

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Mastering Development

Why do I see duplicate Sorting buttons on my WebGrid?

I can see two sorting icons displayed superimposing one another, on each header. Can someone please tell me, why I see them and how to remove them. This WebGrid is in a Partial view and I have defined the DataTable in the partial view too with the same below given definition here is my datatable […]

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Mastering Development

intersection between line and closed curve

I am trying to compute the intersection points between a line and a closed curve (stored in a file) I tried to adapt this import matplotlib.pyplot as plt from scipy.interpolate import interp1d from scipy.optimize import bisect import numpy as np import csv from scipy.interpolate import interp1d from scipy.optimize import bisect #reading curve from file r […]

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Mastering Development

Create 2 subdivs of child Div and add Dynamic unique ID on Appended Child Divs?

I am currently building a blackjack game and each time I press “hit”, I run this function which appends divs that represents a card pulled from a deck. I am able to set a ID to the div, but I want each ID to increment in value… So div1, div2, div3. Currently, each div gets […]

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Mastering Development

Find unique elements in numpy array based on another array

I have two numpy arrays for which I’d like to find the number of unique entries in x separated by the uniqueness array u. For instance the following two arrays would return a uniqueness score of 19. x = [1, 2, 1, 0, 3, 1, 2, 2, 4, 0, 0, 1, 3, 3, 2, 1, […]

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Mastering Development

Rotate binary search tree after every insert java

I need to rotate the tree after every insert, and it goes well while I add only lesser/greater value than his parent. I mean, if I insert 6-4-3 the resulting tree after the 2 rotations will be (read that like a level order print) 3-4-6 and it’s ok, but if I add a greater value […]

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Mastering Development

Can you define Const variables for any Class?

While declaring const the following observation is not understood: const abc=[3,4,5,6] Here we are declaring abc as const means we are fixing pointer to point to a object. Does this mean that we cannot change list members through abc i.e abc[0]=5 or we cannot assign it a new list abc=[5,6,7] If a create a class […]

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Mastering Development

How to combine two lists of lists element-wise?

I would like to combine lists of lists in a very specific way, but I could not find it yet. Any ideas are welcome! With the following input: firstList = [[[1], [2], [3]], [[4], [5], [6]]] secondList = [[[11], [12], [13]], [[14], [15], [16]]] I would like to get the following output: [[[1, 11], [2, […]

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Ask Engineering

Accuracy of a superdiode current transformer amplifier

I am thinking about this design (currently simulated in Qucs): to amplify and fully rectify a 60Hz signal from a current detection transformer, the ASM-010. It has an input range of 0-10A AC, and at the top of its range it is specified to output 33mV AC with a load of 50Ω. I’d ideally like […]