[Solved] Scraping Project Euler site with scrapy [closed]

[ad_1] I think I have found a simplest yet fitting solution (at least for my purpose), in respect to existent code written to scrape projecteuler: # -*- coding: utf-8 -*- import scrapy from eulerscraper.items import Problem from scrapy.loader import ItemLoader class EulerSpider(scrapy.Spider): name = “euler’ allowed_domains = [‘projecteuler.net’] start_urls = [“https://projecteuler.net/archives”] def parse(self, response): numpag … Read more

[Solved] Reading output of a function as an input in another function [closed]

[ad_1] The optimization algorithm that I was using was GA(Genetic Algorithm). I wrote this function in order to get what I wanted: function [zz,fvalzz] = secstep(z,NVARS) [zz,fvalzz]=ga(@secfun,NVARS); function ff = secfun(zz) y=.5*exp(-35*10^12*(t-2e-6).^2).*cos(2*pi*5e6*(t-2e-6)+0); sigme2=zz(1)* exp(-z(1)*10^12*(t-zz(2)*10^-6).^2).*cos(2*pi*z(3)*10^6*(t-zz(2)*10^-6)+z(4)); %z vector has been calculated from another function. NN=length(y); ff =sum((y-sigme2).^2)/NN; end end [ad_2] solved Reading output of a function as … Read more

[Solved] Java , The equals() Method [closed]

[ad_1] Result of equals method depends very much on its implementation. Method equals of Object: public boolean equals(Object obj) { return (this == obj); } This means, that equals will return true, only if the two variables holds the references (therefore references to the same object). If it returns false, this must by caused by … Read more

[Solved] Amend img src using jQuery [closed]

[ad_1] Check out this jsfiddle: <img src=”https://stackoverflow.com/uploads/lorem_m_1-375×349.png”> <img src=”/uploads/ipsum_m_1-248×378.png”> <img src=”/uploads/dolor_m_1-392×298.png”> $(‘img’).each(function() { var src = $(this).attr(‘src’); $(this).attr(‘src’,replaceNumbers(src)); //console.log($(this).attr(‘src’)); }); function replaceNumbers(str) { var regex = /-\d+x\d+/; return str.replace(regex,”); } replaceNumbers() simply takes a string (in this case, your image source) and replaces the ‘-00×00’ with empty string. Then, it returns that string, and in … Read more

[Solved] Weird accessing SQL data [closed]

[ad_1] SELECT meta_value FROM tablename WHERE meta_key = first_name SHould do the trick! What we are doing is selecting the value in the meta-value column if the meta_key column says ‘first_name’ You can do the same for all fields SELECT meta_value FROM tablename WHERE meta_key = admin_color Would return ‘fresh’ from your screen-shot. 2 [ad_2] … Read more

[Solved] Create an URL that contains informations to center the map present on the site linked [closed]

[ad_1] What kind of solution? Google Maps API How? You should read well the Google Maps API documentation which is extensive and packed with code samples. Now, in a nutshell, your map needs to know some basic information which you MUST provide, that information is geographical location which comes in latitudes and longitudes. Then you … Read more

[Solved] How to resolve InvalidCastException after translating LINQ-to-JSON query from c# to VB.NET?

[ad_1] In order for {columns}.Concat(rows) to work, it seems you need to add an explicit call to AsEnumerable() in order to make sure the type TSource for Enumerable.Concat(IEnumerable<TSource>, IEnumerable<TSource>) is inferred correctly: Dim csvRows = { columns.AsEnumerable() }.Concat(rows) _ .Select(Function(r) String.Join(“,”, r)) Fixed fiddle #1 here. A DirectCast({columns}, IEnumerable(Of IEnumerable(Of String))) also seems to work, … Read more

[Solved] how to write regular expression makes sure that there is no digits after

[ad_1] [*] Use a negative lookahead assertion: r’\b[a-z][*]{2}1(?!\d)’ The (?!…) part is the lookahead; it states that it cannot match at any location where a digit (\d) follows. Regex101 demo; note how only the second line is matched (blue). Python demo: >>> import re >>> pattern = re.compile(r’\b[a-z][*]{2}1(?!\d)’) >>> pattern.search(‘x**1’) <_sre.SRE_Match object at 0x10869f1d0> >>> … Read more

[Solved] Line break gets replaced with rn in php

[ad_1] Try removing any stripslahes(). Stripslashes removes any backslashes and forward slashes. For example, line breaks are being sent as \n or \r and the stripslashes() takes away the backslashes in those, so that’s why it says ‘rn’. I had this very problem, and this solution helped me. Good luck! 1 [ad_2] solved Line break … Read more