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Test whether string is a valid integer
... trying to do something common enough: Parse user input in a shell script. If the user provided a valid integer, the script does one thing, and if not valid, it does something else. Trouble is, I haven't found an easy (and reasonably elegant) way of doing this - I don't want to have to pick it apart...
How to set size for local image using knitr for markdown?
... for all document formats that knitr supports, so you do not need to think if you have to use, for example, LaTeX or Markdown syntax, to embed an external image. Chunk options related to graphics output that work for normal R plots also work for these images, such as out.width and out.height.
Examp...
Listing and deleting Git commits that are under no branch (dangling?)
...tion, but if you want, you could still get to it with git checkout 000001. Now the question is, Is 000001 a dangling commit, or an unreachable commit, or neither, or both?
– chharvey
Sep 21 '18 at 1:10
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Making heatmap from pandas DataFrame
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If you don't need a plot per say, and you're simply interested in adding color to represent the values in a table format, you can use the style.background_gradient() method of the pandas data frame. This method colorizes the ...
Convert Bitmap to File
...o be done in background (NOT IN THE MAIN THREAD) it hangs the UI specially if the bitmap was large
File file;
public class fileFromBitmap extends AsyncTask<Void, Integer, String> {
Context context;
Bitmap bitmap;
String path_external = Environment.getExternalStorageDirectory() +...
Select records from NOW() -1 Day
...e a way in a MySQL statement to order records (through a date stamp) by >= NOW() -1 so all records from the day before today to the future are selected?
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MySQL Error 1215: Cannot add foreign key constraint
...y are primary keys in their own tables. I have done both of these things, if I'm not mistaken. Any other help you guys could offer?
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Proper way to exit iPhone application?
...Don't do that" is never the correct answer. Give warnings and disclaimers if you like, but the only correct answer to "how do I do this" is "here's how to do it". If I'm searching for how to do something (maybe I want to force it to exit while debugging), people righteously declaring "you don't!" ...
Inserting a Python datetime.datetime object into MySQL
... the TypeError because you need quotes around the datecolumn value.
Try:
now = datetime.datetime(2009, 5, 5)
cursor.execute("INSERT INTO table (name, id, datecolumn) VALUES (%s, %s, '%s')",
("name", 4, now))
With regards to the format, I had success with the above command (which ...
TCPClient TCP客户端扩展：连接TCP服务器进行文本消息通信 · App Inventor 2 中文网
...鼠标移动时拖动元素 document.onmousemove = function(e) { if (!isDragging) return; element.style.left = (e.clientX - offsetX) + 'px'; element.style.top = (e.clientY - offsetY) + 'px'; }; // 鼠标释放时停止拖动 document.onmouseup = function(...