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Drop unused factor levels in a subsetted data frame
... a factor . When I create a subset of this dataframe using subset or another indexing function, a new data frame is created. However, the factor variable retains all of its original levels, even when/if they do not exist in the new dataframe.
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How to get all groups that a user is a member of?
...Shell's Get-ADGroupMember cmdlet returns members of a specific group. Is there a cmdlet or property to get all the groups that a particular user is a member of?
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How To Create Table with Identity Column
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I believe that is what I was looking for. I don't need to change the PK_History value to ID or anything?
– jp2code
May 23 '12 at 18:36
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How to remove underline from a link in HTML?
...t;yoursite</a>
However remember that you should generally separate the content of your website (which is HTML), from the presentation (which is CSS). Therefore you should generally avoid inline styles.
See John's answer to see equivalent answer using CSS.
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Java FileOutputStream Create File if not exists
Is there a way to use FileOutputStream in a way that if a file (String filename) does not exist, then it will create it?
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Which letter of the English alphabet takes up most pixels?
I am trying to do some dynamic programming based on the number of characters in a sentence. Which letter of the English alphabet takes up the most pixels on the screen?
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All Ruby tests raising: undefined method `authenticate' for nil:NilClass
Most of my tests are raising the following and I don't understand why. All methods call raise the 'authenticate' error. I've checked the code if there was a method called "authenticate" but there is no such method.
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jquery how to empty input field
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if you hit the "back" button it usually tends to stick, what you can do is when the form is submitted clear the element then before it goes to the next page but after doing with the element what you need to.
$('#shares').keyup(function(){
payment = 0;
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C++ Tuple vs Struct
Is there is any difference between using a std::tuple and a data-only struct ?
12 Answers
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Evaluating a mathematical expression in a string
This returns the following error:
11 Answers
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