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How does BLAS get such extreme performance?
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Most arguments to the second question -- assembler, splitting into blocks etc. (but not the less than N^3 algorithms, they are really overdeveloped) -- play a role. But the low velocity of your algorithm is caused essentially by matrix size and the unfortunate arrangement of the three nested loops....
python: How do I know what type of exception occurred?
...ir!")
If you want to dig deeper and examine the stack, look at variables etc., use the post_mortem function of the pdb module inside the except block:
import pdb
pdb.post_mortem()
I've found this last method to be invaluable when hunting down bugs.
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How to measure time taken between lines of code in python?
...g about time.time() is that it is affected by time sunchronization ntpdate etc. I would say time.clock() would be the only reliable alternative because of this
– www.jensolsson.se
Jul 26 '16 at 6:58
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Two-way encryption: I need to store passwords that can be retrieved
...ect against information disclosure vulnerabilities (XSS, remote inclusion, etc). If it gets out, the attacker can eventually crack the encryption (no encryption is 100% un-reversible without the key - As @NullUserException points out this is not entirely true. There are some encryption schemes tha...
Changing the default header comment license in Xcode
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This only changes the organisation and not the license etc.
– mmmmmm
How to replace multiple strings in a file using PowerShell
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Assuming you can only have one 'something1' or 'something2', etc. per line, you can use a lookup table:
$lookupTable = @{
'something1' = 'something1aa'
'something2' = 'something2bb'
'something3' = 'something3cc'
'something4' = 'something4dd'
'something5' = 'somethi...
How do I get the number of elements in a list?
...he Python world. * There's no difference between class, variable, global, etc in these conventions.
– Shai Alon
Dec 4 '16 at 16:30
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App Inventor 2 Encrypt.Security 安全性扩展：MD5哈希，SHA1和SHA256哈希...
...ypt.Security 安全性扩展
这是关于App Inventor和Thunkable安全性的扩展，它提供MD5哈希，SHA1和SHA256哈希，AES加密/解密，RSA加密/解密，BASE64编码/解码方法。
权限
此扩展程序不需要任何权限。
事件
OnErrorOccured
抛出任何异常时将触...
Should a return statement be inside or outside a lock?
...rnInside is a simpler/cleaner bit of C#)
And look at the IL (release mode etc):
.method private hidebysig static int32 ReturnInside() cil managed
{
.maxstack 2
.locals init (
[0] int32 CS$1$0000,
[1] object CS$2$0001)
L_0000: ldsfld object Program::sync
L_0005: dup ...
Java: parse int value from a char
...', '2', ... in ascii are ascending. So e.g. '0' in ascii is 48, '1' is 49, etc. So if you take '2' - '0' you really just get 50 - 48 = 2. Have a look at an ASCII table in order to understand this principle better. Also, 'x' means get the ascii value of the character in Java.
– ...