大约有 30,000 项符合查询结果（耗时：0.0321秒） [XML]
Difference between len() and .__len__()?
...ething should be a function and not a method code, reasoning that len(a)'s meaning would be clear to beginners but a.len() would not be as clear. When Python started __len__ didn't even exist and len was a special thing that worked with a few types of objects. Whether or not the situation this leave...
Summarizing multiple columns with dplyr? [duplicate]
...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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Why can I access private variables in the copy constructor?
...let the private data be open to other objects. But access modifiers aren't meant to make data "openly" enough. They are rather meant to make data closed enough for encapsulation. (In terms of convenience it would be even better if private variables where public!) I updated my answer with a section w...
Automatically enter SSH password with script
...password. But you would copy the private key onto your thumb drive, which means the thumb drive would be the only thing that can log in without a password.
– Aaron McDaid
Aug 30 '12 at 18:36
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Relative frequencies / proportions with dplyr
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What if one would calculate the mean, sd and SE as well in this example?
– user3655531
Jan 16 '17 at 12:34
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How are people unit testing with Entity Framework 6, should you bother?
...ct rather than a huge DBContext but i couldn't find the sweet spot between meaningful tests and bare-bone tests. Chalk it up to my inexperience.
So i find Effort interesting; if you need to hit the ground running it is a good tool to quickly get started and get results. However i think that somethin...
Can you get the column names from a SqlDataReader?
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I mean just an east way to get the values in the result set into a list, or perhaps the whole thing to an IEnumerable<dynamic> object.
– Travis Heeter
Jul 27 '15 at 12:54
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How does std::move() transfer values into RValues?
...;
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Now we get to the tricky part: what does Object& && even mean and how can it bind to lvalue?
To allow perfect forwarding, C++11 standard provides special rules for reference collapsing, which are as follows:
Object & & = Object &
Object & && = Object &a...
execute function after complete page load
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I'm little bit confuse that what you means by page load completed, "DOM Load" or "Content Load" as well? In a html page load can fire event after two type event.
DOM load: Which ensure the entire DOM tree loaded start to end. But not ensure load the reference ...
How do I pull from a Git repository through an HTTP proxy?
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@MSmith If you had to set https_proxy this means you were using https not http which question is about.
– Piotr Dobrogost
Mar 5 '12 at 15:45
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