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Convert float to double without losing precision
I have a primitive float and I need as a primitive double. Simply casting the float to double gives me weird extra precision. For example:
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消息缓冲区类MessageBuffer，接收线程将受到的消息放入缓冲区，发送...
What is the equivalent of “none” in django templates?
...if a field/variable is none within a Django template. What is the correct syntax for that?
7 Answers
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...。
如果在三台服务器中创建相同的目录。然后使用Rsync做实施同步怎样呢？
这种方式有两个最重要的缺陷。由于Rsync是对文件进行操作，层次比价高，使用Rsync对文件夹进行同步，会占用大量的磁盘I/O和网络带宽。同时如果...
How do I format a string using a dictionary in python-3.x?
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Since the question is specific to Python 3, here's using the new f-string syntax, available since Python 3.6:
>>> geopoint = {'latitude':41.123,'longitude':71.091}
>>> print(f'{geopoint["latitude"]} {geopoint["longitude"]}')
41.123 71.091
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How do I find out what keystore my JVM is using?
I need to import a certificate into my JVM keystore. I am using the following:
10 Answers
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Find and replace strings in vim on multiple lines
...The :&& command repeats the last substitution with the same flags. You can supply the additional range(s) to it (and concatenate as many as you like):
:6,10s/<search_string>/<replace_string>/g | 14,18&&
If you have many ranges though, I'd rather use a loop:
:for range...
Is git good with binary files?
Is git good with binary files?
6 Answers
6
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Replace a value in a data frame based on a conditional (`if`) statement
...character(junk$nm)
junk$nm[junk$nm == "B"] <- "b"
EDIT: And if indeed you need to maintain nm as factors, add this in the end:
junk$nm <- as.factor(junk$nm)
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How can I click a button behind a transparent UIView?
Let's say we have a view controller with one sub view. the subview takes up the center of the screen with 100 px margins on all sides. We then add a bunch of little stuff to click on inside that subview. We are only using the subview to take advantage of the new frame ( x=0, y=0 inside the subview i...