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中国的股市真真是看不懂了 - 杂谈 - 清泛网 - 专注C/C++及内核技术
中国的股市真真是看不懂了截止2015 7 9 13:30，沪深A股4股下跌，超半数股票停盘：其余：2812-1335-4=1473 只股票停盘（停盘占比52%）创业板涨停：历经一个多月的暴...截止2015/7/9 13:30，沪深A股4股下跌，超半数股票停盘：
其...
Ora-00257 错误处理一列 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...查看权限
ll .bash_profile
-rw--rw--- 1 oracle oinstall 529 10鏈?24 20:18 /home/oracle/.bash_profile
有问题。修改权限
chmod 775 /home/oracle/.bash_profile
进入ORLACE
sqlplus /as sysdba
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES...
Linux日志切分工具：Logrotate - 更多技术 - 清泛网 - 专注C/C++及内核技术
...e "man logrotate" for details
# rotate log files weekly
weekly
# keep 4 weeks worth of backlogs
rotate 4
# create new (empty) log files after rotating old ones
create
# uncomment this if you want your log files compressed
#compress
# RPM packages drop log rotation information into t...
tinygrad：不到1000行代码的深度学习框架，天才黑客开源GitHub 2.3k+ stars...
...yBobNet:
def __init__(self):
self.l1 = Tensor(layer_init_uniform(784, 128))
self.l2 = Tensor(layer_init_uniform(128, 10))
def forward(self, x):
return x.dot(self.l1).relu().dot(self.l2).logsoftmax()
model = TinyBobNet()
optim = optim.SGD([model.l1, model.l2], lr=0....
How to remove unused C/C++ symbols with GCC and ld?
...
maxschlepzig
24.6k99 gold badges9999 silver badges130130 bronze badges
answered Jul 21 '11 at 1:11
J TJ T
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How do you delete a column by name in data.table?
... copy of it), Methods 1, 2a, and 2b are really the best options.
# Method 4:
df3[, .SD, .SDcols = !patterns("^foo$")]
Lastly there are approaches using with=FALSE, though data.table is gradually moving away from using this argument so it's now discouraged where you can avoid it; showing here so...
Convert a Python list with strings all to lowercase or uppercase
...
461
It can be done with list comprehensions. These basically take the form of [function-of-item fo...
List comprehension: Returning two (or more) items for each item
...gt; list(chain.from_iterable((f(x), g(x)) for x in range(3)))
[2, 0, 3, 1, 4, 4]
Timings:
from timeit import timeit
f = lambda x: x + 2
g = lambda x: x ** 2
def fg(x):
yield f(x)
yield g(x)
print timeit(stmt='list(chain.from_iterable((f(x), g(x)) for x in range(3)))',
setu...
Define variable to use with IN operator (T-SQL)
...
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内存管理内幕：动态分配的选择、折衷和实现 - C/C++ - 清泛网 - 专注C/C++及内核技术
...更多的内存。
在 32-位 x86 系统上，每一个进程可以访问 4 GB 内存。现在，大部分人的系统上并没有 4 GB 内存， 即使您将 swap 也算上， 每个进程所使用的内存也肯定少于 4 GB。因此，当加载一个进程时， 它会得到一个取决于某...