A negative number is a number that is less than 0. It is signified by a preceding hyphen (i.e. -12,345).
This tag should be used for any questions dealing specifically with negative numbers.
Questions tagged [negative-number]
599 questions
12
votes
2 answers
Why does double.IsNegative(double.NaN) return true?
Why does double.IsNegative(double.NaN) unexpectedly return true whereas double.NaN < 0 returns false as expected?
tiger-empire
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12
votes
7 answers
How to turn all numbers in a list into their negative counterparts?
I am trying to turn a list of positive numbers into a list of negative numbers with the same value in python 3.3.3
For example turning [1,2,3] into [-1,-2,-3]
I have this code:
xamount=int(input("How much of x is…
user3368627
10
votes
6 answers
Are hexadecimal numbers ever negative?
Are hexadecimal numbers ever negative? If yes then how?
For binary you would have signed and unsigned.
How would one represent them in Hex? I need this for a hex routine I am about to embark upon.
phoenix
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10
votes
1 answer
Stacked bar charts using python matplotlib for positive and negative values
I am trying to plot a stacked bar chart with python Matplotlib and I have positive and negative values that I want to draw. I have had a look at other posts talking about how to plot stacked bar charts with positive and negative values, but none of…
Juwairia
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10
votes
3 answers
Distinguish zero and negative zero
I have run into a situation in my code where a function returns a double, and it is possible for this double to be a zero, a negative zero, or another value entirely. I need to distinguish between zero and negative zero, but the default double…
Dan Brenner
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10
votes
4 answers
Integer division & modulo operation with negative operands in Python
Questions arise when I type in these expressions to Python 3.3.0
-10 // 3 # -4
-10 % 3 # 2
10 // -3 # -4
10 % -3 # -2
-10 // -3 # 3
It appears as though it takes the approximate floating point (-3.33)? and rounds down either way in integer…
tlands_
- 176
- 1
- 10
10
votes
7 answers
Detecting and adjusting for negative zero
I have some code that has been port from Java to C++
// since this point is a vector from (0,0,0), we can just take the
// dot product and compare
double r = point.dot(normal);
return (r>=0.0);
But in C++ r can be either +0.0 or -0.0, when r equals…
Justin
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9
votes
3 answers
Quick way to check if the pandas series contains a negative value
What is the quickest way to check if the given pandas series contains a negative value.
For example, for the series s below the answer is True.
s = pd.Series([1,5,3,-1,7])
0 1
1 5
2 3
3 -1
4 7
dtype: int64
Krzysztof Słowiński
- 6,239
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9
votes
2 answers
Is there a functional difference between "x = -x" and "x *= -1" when negating values?
Code example:
float f = 123.456;
int i = 12345;
// negate by changing sign
i = -i;
f = -f;
// negate by multiplying with -1
i *= -1;
f *= -1.0f;
Apart from aesthetics, is there any factual reason why one should prefer one way over the other?
To me…
CodeSmile
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9
votes
6 answers
how to change negative sign position css
I have a web site that shows its content it two direction. rtl & ltr.
When page is in ltr content mode, every thins is OK and the negative sign shows in the left of number.
body {
direction: ltr;
}
For example: -1
But when page is in rtl…
Tavousi
- 14,848
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- 70
9
votes
1 answer
Why doesn't my Haskell function accept negative numbers?
I am fairly new to Haskell but do get most of the basics. However there is one thing that I just cannot figure out. Consider my example below:
example :: Int -> Int
example (n+1) = .....
The (n+1) part of this example somehow prevents the input of…
Jonathan Pike
- 93
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- 3
9
votes
4 answers
Change NSNumberFormatter's negative format from (xxx.xx) to -xxx.xx
I want to change my NSNumberformatter from displaying negative numbers with parenthesis around them to putting the minus sign in front (or whatever the localized standard is).
I would assume I could do this with setNegativeFormat:
but reading…
Meltemi
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8
votes
3 answers
Are process ids non-negative in Linux?
I am implementing a syscall that is called in user-space, lets say by foo.
The syscall accesses foo's task_struct ( throught the global pointer current), prints it's name and pid, then goes on to foo's parent-process, foo's parent's parent etc.…
Plazo
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8
votes
4 answers
Why can cosine similarity between two vectors be negative?
I have 2 vectors with 11 dimentions.
a <- c(-0.012813841, -0.024518383, -0.002765056, 0.079496744, 0.063928973,
0.476156960, 0.122111977, 0.322930189, 0.400701256, 0.454048860,
0.525526219)
b <- c(0.64175768, 0.54625694, …
Robin
- 81
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8
votes
2 answers
Replacing negative values in a model (system of ODEs) with zero
I'm currently working on solving a system of ordinary differential equations using deSolve, and was wondering if there's any way of preventing differential variable values from going below zero. I've seen a few other posts about setting negative…
Dorian
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