Notation refers to a specific way of writing various concepts, functions, etc. Usually it is introduced to abbreviate complicated expressions and make common idioms more readable.
Questions tagged [notation]
633 questions
32
votes
6 answers
What does this notation do for lists in Python: "someList[:]"?
I sometimes get across this way of printing or returning a list - someList[:].
I don't see why people use it, as it returns the full list.
Why not simply write someList, whithout the [:] part?
Petr S
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29
votes
3 answers
Bang Notation and Dot Notation in VBA and MS-Access
While perusing an application that I'm documenting, I've run across some examples of bang notation in accessing object properties/methods, etc. and in other places they use dot notation for what seems like the same purpose.
Is there a difference or…
Nitrodist
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27
votes
3 answers
Should I use single colons (:) or double colons (::) for before, after, first-letter and first-line pseudo-elements?
From MDN:
The :: notation was introduced in CSS 3 in order to establish a
discrimination between pseudo-classes and pseudo-elements. Browsers
also accept the notation : introduced in CSS 2.
If the notation : will always be accepted by CSS3…
Oriol
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26
votes
2 answers
What is the etymology of <*> from Applicative in Haskell?
Where did the name <*> first begin to appear in literature or code, and did it come with any explanation for the choice of symbol?
Chris Martin
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26
votes
5 answers
What is the difference between "std::string const &s" and "const std::string &s"?
I was looking for examples on how to do something and saw this two variants:
std::string const &s;
const std::string &s;
in different snippets.
thx for your answer :)
Thomas Good
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26
votes
1 answer
Subscripts and superscripts "-" or "+" with ggplot2 axis labels? (ionic chemical notation)
I got this plot using the code below
In my plot, I want the NO3 to have negative sign"-" as superscript like below
In the label of x axis, I couldn't use negative sign only as a superscript to NO3 so I had to use -1 as shown below
x <-…
shiny
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25
votes
4 answers
How to remove scientific notation on a matplotlib log-log plot
I know that this question has been asked before, but I tried all the possible solutions and none of them worked for me.
So, I have a log-log plot in matplotlib, and I would like to avoid scientific notation on the x-axis.
This is my code:
from numpy…
Tropilio
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24
votes
3 answers
Python Scientific Notation precision normalizing
My goal is simply to convert a string such as "1.2" to scientific notation without adding additional precision. The problem is that I always end up with superfluous 0s at the end of my output.
>>> input = "1.2"
>>> print…
Alex Pritchard
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24
votes
10 answers
maximum value for type float in c#
When I do this:
float x = float.MaxValue;
I have the result: 3.40282347E+38
What is E+38? how can I represent the maximum number without this symbol?
msdn says RANGE: ±1.5 × 10^−45 to ±3.4 × 10^38, but that did not help me.
Tyrael Archangel
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22
votes
3 answers
Case statements evaluate to strings
I've caught the functional programming bug, so naturally nothing is good enough for me anymore. ;)
So, in bash one could write:
case $status in
"foo") status="bar" ;;
"baz") status="buh" ;;
*) status=$status ;;
esac
but I'm afraid of typos,…
mbac32768
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22
votes
2 answers
1e-9 or -1e9, which one is correct?
I am assigned some old code and when I was reading through it, I noticed it had these in the form of:
float low = 1e-9;
float high = 1e9;
float lowB = 1e-9;
float highB = 1e9;
float lowL = 1e-9;
float highL = 1e9;
So I see that it's trying to…
Joan Venge
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21
votes
4 answers
What is "?:" notation in JavaScript?
I found this snippet of code in my travels in researching JSON:
var array = typeof objArray != 'object' ? JSON.parse(objArray) : objArray;
I'm seeing more and more of the ? and : notation. I don't even know what it is called to look it up! Can…
webdad3
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21
votes
4 answers
In Java, when is the {a,b,c,...} array shorthand inappropriate, and why?
If you're defining a variable, it appears to be perfectly valid to declare/define a variable as follows:
double[][] output = {{0,0},{1,0}};
But if you're returning a value, it appears to be invalid to write the following:
public double[]…
John P
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19
votes
6 answers
Why isn't "0f" treated as a floating point literal in C++?
Why isn't 0f treated as a floating point literal in C++?
#include
using namespace std;
int main(){
cout << 0f << endl;
return 0;
}
Compiling the above gives me
C2509 (syntax error: 'bad suffix on number')
using VS2008.
Agnel Kurian
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18
votes
6 answers
What is the "M- notation" and where is it documented?
The man page of cat says:
-v, --show-nonprinting
use ^ and M- notation, except for LFD and TAB
What is the M- notation and where is it documented?
Example:
$cat log -A
wrote 262144 bytes from file test.x in 9.853947s (25.979 KiB/s)^M$
^M>…
eDeviser
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