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问题 Is there any documentation for the Spotify Web API as to which characters are valid when searching? For example "Macklemore & Ryan Lewis" needs the & to be url encoded in order for the request to work. The character ":" is completely invalid it seems. In order to search for an album like "Pink Friday: Roman Reloaded", I have to remove the : completely from the String. Even URL encoding it doesn't work. This probably was to do with the fact that : seems to be used to separate the fields of the

问题 I am trying to implement a vectorized exponentially weighted moving standard deviation using R. Is this the correct approach? ewma <- function (x, alpha) { c(stats::filter(x * ratio, 1 - ratio, "recursive", init = x[1])) } ewmsd <- function(x, alpha) { sqerror <- na.omit((x - lag(ewma(x, ratio)))^2) ewmvar <- c(stats::filter(sqerror * ratio, 1 - ratio, "recursive", init = 0)) c(NA, sqrt(ewmvar)) } I'm guessing it's not, since its output is different from Python's pandas.Series.ewm.std()

问题 I have a dataset, made up of a mask file, and a data file. the mask file tells the decoder whether there are 8 bits per field present, or 4, for the current offset of the datafile. I need to shift the data out according to the mask, and write the decoded file, with all 8 bits per field. I'm trying to accomplish this in C. void shift_4bits_left(unsigned char* array, unsigned short size) { int i; unsigned char shifted = 0x00; unsigned char overflow = (0xF0 & array[0]) >> 4; for (i = (size - 1);

问题 I am using Rotativa to generate a pdf of my view. on my local computer this works. On my online server, it says cannot locate file or directory. It is probably a permission problem. Any idea how to fix it? Thanx in advance 回答1: Rotativa uses wkhtmltopdf at its' core, which starting from >0.12.0.0 relies on distributable VC++ lib (msvcp120.dll) You may need to download the installer from here rather than just copy dll over to the server http://wkhtmltopdf.org/downloads.html Simple test if

问题 I have a CSV log file and it contains many rows like this: 2016-06-21 12:00:00,000 : helloworld: header1=2;header2=6;header=0 I want to write them to a new CSV file. public void readLogFile() throws Exception { String currentLine = ""; String nextLine = ""; BufferedReader reader = new BufferedReader(new FileReader(file(false))); while ((currentLine = reader.readLine()) != null) { if (currentLine.contains("2016") == true) { nextLine = reader.readLine(); if (nextLine.contains("helloworld") ==

问题 I have lots of tables and lots of relationships between them. When I try to make some join between them I'm stuck at finding the relationship between the two tables. For the sake of simplicity let's say I have Table A and Table B . They are linked with a foreign key. Q: How can I find the foreign key between this two exact tables and the column it references? And not all the tables or foreign keys that have a reference to this table. 回答1: You can join the data dictionary constraint-related

问题 I have an MVC web application. The URL for a particular area is coming in as: http://localhost/General/Bpa%3fapplication%3dTrf%23/GeneralInputs This causes a "The resource cannot be found." error. However, if I change the URL to http://localhost/General/Bpa?application=Trf#/GeneralInputs then everything works. I can see from using some route debugging tricks that the controller in the first case is: "Bpa?application=Trf#", whereas the second one is: "Bpa", which is correct. How can I account

问题 I am writing a script to check mail and I want it to check the unread mail every 20 or 30 minutes how can I schedule this task to run every 30 minutes using powershell. 回答1: Here's a sample Powershell script which creates a scheduled task which can run with admin privileges passing argument -RunLevel Highest makes it run as administrator, you may need to provide valid username/password which has admin right on the machine $frequencyInMin = 20 $taskAction = New-ScheduledTaskAction -Execute

问题 I am writing a script to check mail and I want it to check the unread mail every 20 or 30 minutes how can I schedule this task to run every 30 minutes using powershell. 回答1: Here's a sample Powershell script which creates a scheduled task which can run with admin privileges passing argument -RunLevel Highest makes it run as administrator, you may need to provide valid username/password which has admin right on the machine $frequencyInMin = 20 $taskAction = New-ScheduledTaskAction -Execute

问题 Let's say I have this Kanji "亜" which is represented in JIS X 208 code in hex form: 0x3021. I want my Python program to convert that code into its UTF-8 form E4BA9C so that I can pass that string (URL-encoded) into my url like this http://jisho.org/api/v1/search/words?keyword=%E4%BA%9C I'm using Python 2.7.12 but I'm open to Python 3 solution as well 回答1: These are accessed under ISO 2022 codec. >>> '亜'.encode('iso2022_jp') b'\x1b$B0!\x1b(B' If I saw those bytes not framed by the escape