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Map function in MATLAB?
I'm a little surprised that MATLAB doesn't have a Map function, so I hacked one together myself since it's something I can't live without. Is there a better version out there? Is there a somewhat-standard functional programming library for MATLAB out there that I'm missing?
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Efficient evaluation of a function at every cell of a NumPy array
...e x * 5 + 8
f = np.vectorize(f) # or use a different name if you want to keep the original f
result_array = f(A) # if A is your Numpy array
It's probably better to specify an explicit output type directly when vectorizing:
f = np.vectorize(f, otypes=[np.float])
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Find the division remainder of a number
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you are looking for the modulo operator:
a % b
for example:
26 % 7
Of course, maybe they wanted you to implement it yourself, which wouldn't be too difficult either.
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Calling JMX MBean method from a shell script
...h JMX, and we could have our admins use JConsole, or VisualVM, but some tasks are better left to automation. In that automation we'd like to be able to call a JMX MBean method on our running server, preferably from a shell script.
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Does opacity:0 have exactly the same effect as visibility:hidden
...space that the element would normally occupy
Responds to events (e.g., click, keypress)
Participates in the taborder
collapse events taborder
opacity: 0 No Yes Yes
visibility: hidden No No No
visibility: collapse Yes* No No
display...
generating GUID without hyphen
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Note that you are talking about the (canonical) string representation of a Guid. The Guid itself is actually a 128-bit integer value.
You can use the "N" specifier with the Guid.ToString(String) overload.
Guid.NewGuid().ToString("N");
By defa...
How does java do modulus calculations with negative numbers?
...his:
int r = x % n;
if (r > 0 && x < 0)
{
r -= n;
}
Likewise if you were using a language that returns a negative number on a negative input and you would prefer positive:
int r = x % n;
if (r < 0)
{
r += n;
}
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Java `final` method: what does it promise?
In a Java class a method can be defined to be final , to mark that this method may not be overridden:
5 Answers
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Does Java support default parameter values?
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Peter Mortensen
26.5k2121 gold badges9292 silver badges122122 bronze badges
answered Jun 15 '09 at 18:14
Kathy Van StoneK...
Why does isNaN(“ ”) (string with spaces) equal false?
...re's 2 steps in interpreting isNaN(arg). 1) Convert arg to number, 2) Check if that number is the numerical value NaN. That helped me understand it better.
– xdhmoore
Feb 20 '14 at 23:08
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