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How do you delete an ActiveRecord object?
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585
It's destroy and destroy_all methods, like
user.destroy
User.find(15).destroy
User.destroy(15...
Java: parse int value from a char
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Try Character.getNumericValue(char).
String element = "el5";
int x = Character.getNumericValue(element.charAt(2));
System.out.println("x=" + x);
produces:
x=5
The nice thing about getNumericValue(char) is that it also works with strings like "el٥" and "el५" where ٥ and ५...
How to switch position of two items in a Python list?
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Tiago Martins Peres 李大仁
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answered Mar 22 '10 at 16:31
samtregarsamtr...
How do I convert a string to a double in Python?
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325
>>> x = "2342.34"
>>> float(x)
2342.3400000000001
There you go. Use float (...
Set a persistent environment variable from cmd.exe
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5 Answers
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In Matlab, when is it optimal to use bsxfun?
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5 Answers
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How do you make a WPF slider snap only to discrete integer positions?
...ian Stewart
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Append a NumPy array to a NumPy array
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In [1]: import numpy as np
In [2]: a = np.array([[1, 2, 3], [4, 5, 6]])
In [3]: b = np.array([[9, 8, 7], [6, 5, 4]])
In [4]: np.concatenate((a, b))
Out[4]:
array([[1, 2, 3],
[4, 5, 6],
[9, 8, 7],
[6, 5, 4]])
or this:
In [1]: a = np.array([1, 2, 3])
In [2]: b = ...
jquery how to empty input field
...ve a numeric input like so <input type="number" min="0' max="10" value="5"></input>? I guess said differently, are you allowed to set a numeric input to be blank?
– Kevin Wheeler
Jun 10 '15 at 21:49
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