understanding MultiIndex

So I have a sample data set like this in csv:- name team date score John A 3/9/12 100 John B 3/9/12 99 Jane B 4/9/12 102 Peter A 9/9/12 103 Josie C 11/9/12 ...

parsing line of input c++

I'm writing a program the do the Depth-first-search. Yes this is homework, but the part I'm having issues with is not the learning point of the assignment. I am being given badly formatted input...

PostgreSQL:How get last rows from a select query

See the below example, create table data(name varchar, value int); insert into data values('joe',1); insert into data values('bob',2); insert into data values('jane',3); insert into data...

Posting JSON from ajax to Struts2 Action

Hey I am trying to post JSON from Ajax to Struts2 action class method. Little more info: I am running client on WAMP server and Struts2 on Eclipse Tomcat. My client side...

pandoc version 1.12.3 or higher is required and was not found (R shiny)

I have a problem generating a pdf report from my app shiny which is hosted on a server. the app works fine but when I press the button to download the report, I get this error : pandoc version...

json2csharp generated class causing webservice call to fail

The following function call using json.net to retrieve my data is causing it to break I dont beleive its the length of data as the function works fine for other data it may be down to my class...

Bind Function Meaning in VueJS

I have a script which is using bind method in VueJS. The purpose of the filter is to return people basing on gender or all. I have the HTML code: <div id="demo"> <div class="radio"> ...

Private Chat Messaging using Node.js, Socket.io, Redis in PHP

I am working for a real time private messaging system into my php application. My codes are working for all users together. But I need private messaging system as one-to-one message. After setup...

R how to calculate relative values based on a long format data.frame column?

I have a dataframe like this and I would like to add a column gene_richness_relative. In this column, the gene_richness value at days == 0 should be set to 100 % as the basis for calculation. The...

How to use echarts to zoom time axis?

I want to use echarts to zoom time axis(X axis) and Y axis.But I don not know how to do it,what attribute to add can zoom X axis and Y axis? I mean, when my left mouse's button selects a part of...

NAs returned when extracting values from a raster

I am trying to extract values from a raster showing density of bears using a spatial points file my script is as follows: ## set the working directory ...

Error when using sql command "OVER PARTITION" using pandas

I was trying to learn SQL over partition command using sqlite3 and pandas. Here is the database and the query: import sqlite3 import numpy as np import pandas as pd # create db if does not...

Jquery multiple selector filter

I have a working example of code I need, but some improvement is required. $("#filtroSolicitacoes").on("submit", function(){ $("#solicitacoes div").show(); var filter = ""; ...

how to filter xml elements for multiple values

XML is stored in a table in SQL server using xml data type. CREATE TABLE MyTable( i int primary key, XmlField xml NULL ) insert into MyTable(i, xmlField) values(1, N'<root> <Area1> ...

Protractor error: Expected null to equal 'some value'

I'm testing non-angular site and have a problem with error message as: Expected null to equal 'some value'. I need to check a value (text) in inputs. The code of element is: <input type="text"...

Using Servicestack, how do you cache result sets when using AutoQuery with a ServiceSource?

I am trying to use ServiceStack's AutoQuery with a service source, but am either unable to get caching working correctly, or have misunderstood how it is supposed to work. What I am trying to...

Import multiple .tsv files at once as data frames

I have N .tsv files saved in a file named "data" into my rstudio working directory and I want to find a way to import them as separated data frames at once. Below is an example when I try to do it...

How to find a number of combinations (not permutations) of values in two columns in R?

I have a dataset, where each row represents a project. Several people may work on every project (between 2 and 6). The column names are id, person_1, person_2, person_3, person_4, person_5,...

Saving blob image in laravel's controller

In my Laravel 5/vuejs 2.6 I upload an image with the vue-upload-component and am sending a requested image blob I try to save it with the controller code like : if (...

How to create a boxplot from data with weights?

I have data on: a Name the number of times the name came up (Count), and a Score for each name. I want to create a box and whisker plot of Score, weighting each name's Score by its Count. The...

How to calculate entropy from frequency table?

I have data on a bunch of names (> 10 million) and their associated counts. import pandas as pd import numpy as np data = { "Name": ['Sara', 'John', 'Mark', 'Peter', 'Kate'], "Count":...

Why can't I search both first and last names using searchBar?

I have implemented code for searchBar and it works if I either search the first or the last name of a person. For example, if I want to search Kate Bell, the search works if I write "Kate", and it...

Error in `$<-.data.frame`(`*tmp*`, "Year", value = character(0)) : replacement has 0 rows, data has 5

I still haven't seen a concrete reason/answer to this question and my dilemma is slightly different. So I am trying to scrape data from a website using a function which row binds it to data...

Deidentifying data and creating crosswalk using duawranglr in R

I am trying to deidentify data using the duawranglr package in R presented in this example: https://cran.r-project.org/web/packages/duawranglr/vignettes/securing_data.html. As an example, I...

Power BI show data between two dates

I would like to show data between two dates. For example given the next table: I would like to show in a bar graph, by month, every person who is included in that month. For example, in 2018...

Unable to Launch VLC Application in Debian Buster

I have setup debian on a newly built machine. I have installed XFCE4 DE. I also installed VLC but I am unable to launch it. My environment details: uname -a returns Linux debianNew 4.19.0-8-amd64...

Blocking problem of graphql-kotlin with DataLoader&BatchLoader

I used the framework "https://github.com/ExpediaGroup/graphql-kotlin" to learn graphql programming of kotlin under springframework. I used DataLoader&BatchLoader to resolve the 'N+1' loading...

Referential integrity constraint violation on delete in a manytomany relationship

Getting this exception org.h2.jdbc.JdbcSQLIntegrityConstraintViolationException: Referential integrity constraint violation: "FKrtt5rijo65gon4wgqj4pv44hj: PUBLIC.user_order FOREIGN KEY(order_id)...

Multiple "Script src" on same page causing sorting functions not to work on HighCharts

I've isolated my issue but haven't been able to fix it. I'm hoping the brilliant minds of stack overflow can assist! Problem: The sorting function stops working when the injected tables are...

gstreamer: No such element or plugin 'v4l2sink'

The problem I am trying to execute a script. Part of it needs to execute v4l2sink. I tried to execute this gst-launch-1.0 videotestsrc ! v4l2sink device=/dev/video1 & mplayer -tv...