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How to randomize (or permute) a dataframe rowwise and columnwise?
...ple(1:n()))
or
df2 <- sample_frac(df1, 1L)
column-wise:
df2 <- select(df1, one_of(sample(names(df1))))
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Can I find out the return value before returning while debugging in Eclipse?
...
Found a really good shortcut for this.
Select the expression which returns the value and press
Ctrl + Shift + D
This will display the value of the return statement. This is really helpful in cases where you can't or don't want to change just for debugging purp...
Can javax.persistence.Query.getResultList() return null?
... places. Especially as the documentation for getResultList reads Execute a SELECT query and return the query results as a(n) (un)typed List. - @return a list of the results. I'd still check for null of course and return an empty list myself if needed.
– René
J...
How do I find and view a TFS changeset by comment text?
...er
Scroll to the bottom (it's fast with hitting "End" button continuously)
Select all records, copy
Open Excel and paste
Now the Excel will allow you to search through comments (Excel's a native app, don't argue..).
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MySQL Workbench Dark Theme
...there somewhere else within the Workbench GUI that I need to go to see and select a theme? Besides under "Edit->Preferences-> Fonts & Colors
– edo101
May 7 at 18:54
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jQuery checkbox change and click event
...tion pops up even for check-action (it should only pop up for uncheck) and selecting ok does not result in checking the box.
– Professor Chaos
Aug 11 '11 at 18:57
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手电筒使用指导 · App Inventor 2 中文网
....TimerEnabled {
手电筒1.Off()
}
}
when 计时器1.Timer() {
if select(节拍, 位置) == 1 {
手电筒1.On()
} else {
手电筒1.Off()
}
位置 = 位置 + 1
if 位置 > length(节拍) {
位置 = 1
}
}
列表里 1 表示亮、0 表示灭，每一格 200 毫秒：...
Recommended way of making React component/div draggable
...ground is important for performance */
background: white;
/* avoid selecting text while dragging */
user-select: none;
}
Example on JSFiddle.
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Android: Generate random color on click?
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This approach might not yield the best results, It always ends up with a selection of similar colors that way too dark or way too bright.
Semi-random approach :
If you need some fresh and shiny colors then use the following simple class, that I wrote previously when I had the same issues. It's ...
XAMPP - MySQL shutdown unexpectedly
...Windows has built-in folder versioning — right click on /mysql/data/ and select Restore previous versions. You can then delete the current contents of the folder and replace it with the older version's contents.
Addendum: To ensure that you don't forget to run XAMPP as an administrator you can ri...