大约有 47,900 项符合查询结果（耗时：0.0656秒） [XML]
ValueError: math domain error
...og as the definition is defining the set of equations, that is, x[0], x[1] and x[2] are variables x,y and z which Newton Raphson uses. It needs these set of equations to solve.
– ramanunni.pm
Apr 8 '13 at 23:11
...
MySQL select with CONCAT condition
I'm trying to compile this in my mind.. i have a table with firstname and lastname fields
and i have a string like "Bob Jones" or "Bob Michael Jones" and several others.
...
PendingIntent does not send Intent extras
...pected behaviour, try to implement void onNewIntent(Intent intent) event handler, that way you can access the new intent that was called for the activity (which is not the same as just calling getIntent(), this will always return the first Intent that launched your activity.
@Override
protected vo...
Heroku/devise - Missing host to link to! Please provide :host parameter or set default_url_options[:
...ost => 'localhost' }
Make sure you change host to your production url and keep it localhost for development. This is for the mailer, it needs a default email to send out notices such as confirmations etc...
You should check the logs on the heroku server heroku logs run that from the console ...
Is there a “do … while” loop in Ruby?
...ere Matz states:
|> Don't use it please. I'm regretting this feature, and I'd like to
|> remove it in the future if it's possible.
|
|I'm surprised. What do you regret about it?
Because it's hard for users to tell
begin <code> end while <cond>
works differently from
<...
When using Spring Security, what is the proper way to obtain current username (i.e. SecurityContext)
...iest way is:
@RequestMapping(method = RequestMethod.GET)
public ModelAndView showResults(final HttpServletRequest request, Principal principal) {
final String currentUser = principal.getName();
}
share
...
How to normalize an array in NumPy?
...:
import numpy as np
from sklearn.preprocessing import normalize
x = np.random.rand(1000)*10
norm1 = x / np.linalg.norm(x)
norm2 = normalize(x[:,np.newaxis], axis=0).ravel()
print np.all(norm1 == norm2)
# True
share
...
How do I check/uncheck all checkboxes with a button using jQuery?
...
This will not work anymore, .toggle(handler, handler) was deprecated in jQuery 1.8 and removed in jQuery 1.9. Now all it does is toggles visibility.
– Himel Das
Apr 7 '16 at 14:59
...
Disable IPython Exit Confirmation
...ake sure the directory exists (or run ipython profile create to create it) and add these lines to $HOME/.ipython/profile_default/ipython_config.py:
c = get_config()
c.TerminalInteractiveShell.confirm_exit = False
share
...
How to programmatically send a 404 response with Express/Node?
...
Sending a status code directly is deprecated in 4.x and will probably be removed at some point. Best to stick with .status(404).send('Not found')
– Matt Fletcher
Oct 22 '14 at 8:50
...