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Summarizing multiple columns with dplyr? [duplicate]
I'm struggling a bit with the dplyr-syntax. I have a data frame with different variables and one grouping variable. Now I want to calculate the mean for each column within each group, using dplyr in R.
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HMAC-SHA1 in bash
Is there a bash script to generate a HMAC-SHA1 hash?
4 Answers
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Can I set null as the default value for a @Value in Spring?
I'm currently using the @Value Spring 3.1.x annotation like this:
5 Answers
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How to rename items in values() in Django?
I want to do pretty much the same like in this ticket at djangoproject.com , but with some additonal formatting. From this query
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Benefits of prototypal inheritance over classical?
So I finally stopped dragging my feet all these years and decided to learn JavaScript "properly". One of the most head-scratching elements of the languages design is it's implementation of inheritance. Having experience in Ruby, I was really happy to see closures and dynamic typing; but for the li...
seek() function?
Please excuse my confusion here but I have read the documentation regarding the seek() function in python (after having to use it) and although it helped me I am still a bit confused on the actual meaning of what it does, any explanations are much appreciated, thank you.
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HTTP Basic Authentication - what's the expected web browser experience?
When a server allows access via Basic HTTP Authentication, what is the experience expected to be in a web browser ?
6 Answ...
Best Practice: Access form elements by HTML id or name attribute?
As any seasoned JavaScript developer knows, there are many (too many) ways to do the same thing. For example, say you have a text field as follows:
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Difference between os.getenv and os.environ.get
Is there any difference at all between both approaches?
5 Answers
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Is there such a thing as min-font-size and max-font-size?
I'm trying to make a font in a div responsive to the browser window. So far, it has worked perfectly, but the parent div has a max-width of 525px . Resizing the browser further will not make the font stop resizing. This has made me wonder if there is such a thing as min-font-size or max-font-s...