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Applying a function to every row of a table using dplyr?
...it useful to use adply for scalar functions that I have to apply to each and every row.
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【软著】软件著作权证书申请流程及注意事项，模板分享 - App Inventor 2 中...
1、什么是软著？有啥用？
“软著”是“软件著作权”的简称，它是指对计算机软件的原创性成果进行法律保护的注册证书。软著是由国家版权局颁发的，表明某一软件在中国的版权归其开发者所有。
软著的作用：法律保护：...
How to sum up an array of integers in C#
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Provided that you can use .NET 3.5 (or newer) and LINQ, try
int sum = arr.Sum();
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Encode URL in JavaScript?
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Be careful. That escape converts non-ASCII characters into its Unicode escape sequences, like %uxxx.
– opteronn
Mar 5 '10 at 20:10
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How do I set default values for functions parameters in Matlab?
... to work with such property/value pairs, parse_pv_pairs.m. It helps you to convert property/value pairs into a matlab structure. It also enables you to supply default values for each parameter. Converting an unwieldy list of parameters into a structure is a VERY nice way to pass them around in MATLA...
Why can't C compilers rearrange struct members to eliminate alignment padding? [duplicate]
...he compiler from aligning the fields according to their natural alignment, and it has no relation to the problem of field ordering. It would be possible to reorder the fields of LocalFileHeader so that the structure has both minimal size and has all fields aligned to their natural alignment. However...
How to read a file without newlines?
...t would help in some circumstances, on my system \r\n line endings are not converted to \n, whether read as text or binary, so os.linesep would work where \n does not. But splitlines is clearly the better choice, in the case you mention where the file does not match the os. Really I mostly mentioned...
When to use std::forward to forward arguments?
...e potentially moving the argument all the way through to the final caller, and once it's moved it's gone, so you cannot then use it again (in the way you probably meant to).
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ActiveModel::ForbiddenAttributesError when creating new user
...e is an easier way to avoid the Strong Parameters at all, you just need to convert the parameters to a regular hash, as:
unlocked_params = ActiveSupport::HashWithIndifferentAccess.new(params)
model.create!(unlocked_params)
This defeats the purpose of strong parameters of course, but if you are i...
Best way to format integer as string with leading zeros? [duplicate]
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The way 004 is parsed by the compiler, and then represented in memory, is exactly the same as 4. The only time a difference is visible is in the .py source code. If you need to store information like "format this number with leading zeros until the hundreds place"...