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What does -1 mean in numpy reshape?
...atrix can be reshaped into a vector using reshape function with parameter -1. But I don't know what -1 means here.
9 Answer...
PHP Regex to check date is in YYYY-MM-DD format
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198
Try this.
$date="2012-09-12";
if (preg_match("/^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|...
Get operating system info
...that, it sniffs your core operating system model, for example windows nt 5.1 as my own.
It then passes windows nt 5.1/i to Windows XP as the operating system.
Using: '/windows nt 5.1/i' => 'Windows XP', from an array.
You could say guesswork, or an approximation yet nonetheless pretty much ba...
Convert tuple to list and back
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answered May 6 '14 at 14:27
KhonixKhonix
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Why does 1==1==1 return true, “1”==“1”==“1” return true, and “a...
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185
Because you are comparing the (boolean) result of the first equality with the (non-boolean) th...
Determining complexity for recursive functions (Big O notation)
...he time complexity, in Big O notation, for each function:
int recursiveFun1(int n)
{
if (n <= 0)
return 1;
else
return 1 + recursiveFun1(n-1);
}
This function is being called recursively n times before reaching the base case so its O(n), often called linear.
int recursi...
What is the best regular expression to check if a string is a valid URL?
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Applying a function to every row of a table using dplyr?
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edited Aug 6 '19 at 3:20
answered Jul 14 '14 at 0:20
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最新版AI伴侣测试历程 - HarmonyOS NEXT - 清泛IT社区，为创新赋能！
[6:37:16 PM] I/[YAIL] begin: 2 个子表达式
[6:37:16 PM] I/[YAIL] begin[1]: (require) len=2
[6:37:16 PM] I/[YAIL] begin[2]: (process-repl-input) len=3
[6:37:16 PM] I/[YAIL] begin: 1 个子表达式
[6:37:16 PM] I/[YAIL] begin[1]: (define-event) len=6
[6:37:16 PM] I/[YAIL] ...