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A monad is just a monoid in the category of endofunctors, what's the problem?
...onally attributes it to Philip Wadler.
The original quote is from Saunders Mac Lane in Categories for the Working Mathematician, one of the foundational texts of Category Theory. Here it is in context, which is probably the best place to learn exactly what it means.
But, I'll take a stab. The origin...
How to convert a SVG to a PNG with ImageMagick?
...nged:
inkscape -w 1024 -h 1024 input.svg --export-filename output.png
(on macOS, you may need to use --export-file instead of --export-filename).
Here's the result of scaling a 16x16 SVG to a 200x200 PNG using this command:
Just for reference, my Inkscape version (on Ubuntu 12.04) is:
Inkscape 0....
How to change my Git username in terminal?
...r=manager you need to open the credential manager of your computer (Win or Mac) and update the credentials there
Here is how it look on windows
Troubleshooting? Learn more
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How to delete from a text file, all lines that contain a specific string?
...h BSD sed:
sed -i '/pattern to match/d' ./infile
Same, but for BSD sed (Mac OS X and FreeBSD) – does not work with GNU sed:
sed -i '' '/pattern to match/d' ./infile
To directly modify the file (and create a backup) – works with BSD and GNU sed:
sed -i.bak '/pattern to match/d' ./infile
...
记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...曾遇到过类似的问题，在他的场景里，问题的主要原因是系统IO操作繁忙时，数据文件预分配堵塞了其它操作，从而导致雪崩效应。
为了验证这种可能，我搜索了一下MongoDB日志：
shell> grep FileAllocator /path/to/log
[FileAllocator] allo...
Google Play on Android 4.0 emulator
...to the image
Now start yaffey on Windows or a similar utility on Linux or Mac, and open system.img for the emulator image you want to modify. I modify most often the one in [...]\android-sdk\system-images\android-17\x86.
Rename the original system.img to system-original.img. Under yaffey, copy the...
How to set specific java version to Maven
On my machine I have two java versions installed: (1.6 and 1.7 installed manually by me). I need both of them for different projects. But for Maven I need 1.7, now my Maven uses 1,6 java version, how can I set Maven to use 1.7?
...
【PM干货】2015年阿里业务型PM笔试题 - 项目管理 - 清泛网 - 专注C/C++及内核技术
...型PM笔试题一、客观题（总共十题）下面那个文件是用户系统间的数据传输：1、UML2、HTML3、XML4、WML458、346、908、739、（）正方体六个面分别是红、...一、客观题（总共十题）
下面那个文件是用户系统间的数据传输：
1、UML 2...
Error: The 'brew link' step did not complete successfully
...
I run Mac OS X Mavericks. I tried to install node 0.10.25 and the top answer did not work for me.
natevw says to rm -rf /usr/local/lib/node_modules/npm but if the permissions on /usr/local/lib/node_modules look like this:
drwxr-...
Using a piano keyboard as a computer keyboard [closed]
... in the comments, it's why rank-and-file stenographers can use a stenotype machine to keep up with people talking for hours in a row, when even top-flight typists wouldn't be able to for any length of time via normal typewriter-style keyboards. As with machine stenography, you'd need a "dictionary" ...