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General suggestions for debugging in R

I get an error when using an R function that I wrote: 13 Answers 13 ...
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How can I remove or replace SVG content?

I have a piece of JavaScript code which creates (using D3.js) an svg element which contains a chart. I want to update the chart based on new data coming from a web service using AJAX, the problem is that each time I click on the update button, it generates a new svg , so I want to remove the old ...
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How to center absolute div horizontally using CSS?

I've a div and want it to be centered horizontally - although I'm giving it margin:0 auto; it's not centered... 8 Answers...
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JavaScript: location.href to open in new window/tab?

I have a JavaScript file from a third party developer. It has a has link which replaces the current page with the target. I want to have this page opened in a new tab. ...
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SQL Data Reader - handling Null column values

I'm using a SQLdatareader to build POCOs from a database. The code works except when it encounters a null value in the database. For example, if the FirstName column in the database contains a null value, an exception is thrown. ...
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Locking a file in Python

I need to lock a file for writing in Python. It will be accessed from multiple Python processes at once. I have found some solutions online, but most fail for my purposes as they are often only Unix based or Windows based. ...
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Difference between reduce and foldLeft/fold in functional programming (particularly Scala and Scala

Why do Scala and frameworks like Spark and Scalding have both reduce and foldLeft ? So then what's the difference between reduce and fold ? ...
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Checking if object is empty, works with ng-show but not from controller?

I have a JS object declared like so 9 Answers 9 ...
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How to clone ArrayList and also clone its contents?

How can I clone an ArrayList and also clone its items in Java? 21 Answers 21 ...
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Closing multiple issues in Github with a commit message

I know you can close issues by putting closes #1 or fixes #1 in the commit message. What is the best way to close multiple issues in the same commit message? ...