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
8
votes
1 answer
Guaranteeing negative result when left shifting a negative number in two's complement?
Assuming a negative binary number is represented in two's complement, how can we guarantee the sign is preserved?
Let's say we represent a decimal number -5 in four bits: 1011, and want to left-shift one place to multiply by 2:
1011 << 1
This…
sgarza62
- 5,998
- 8
- 49
- 69
8
votes
5 answers
Extract negative and non-negative values from an array
I need to divide an array into two arrays.
One array will contain all positive values (and zeros), the other all negative values.
Example array:
$ts = [7,-10,13,8,0,4,-7.2,-12,-3.7,3.5,-9.6,6.5,-1.7,-6.2,7];
Negatives result…
Ripa Saha
- 2,532
- 6
- 27
- 51
8
votes
8 answers
Python: Removing negatives from a list of numbers
The question is to remove negatives from numbers.
When remove_negs([1, 2, 3, -3, 6, -1, -3, 1]) is executed, the result is: [1, 2, 3, 6, -3, 1]. The result is suppose to be [1, 2, 3, 6, 3, 1]. what is happening is that if there are two negative…
user3161743
- 161
- 4
- 8
- 13
8
votes
4 answers
1000 * 60 * 60 * 24 * 30 results in a negative number
I'm attempting to calculate 30 days by multiplying milliseconds however the result continually ends up being a negative number for the value of days_30 and I'm not sure why.
Any suggestions are greatly appreciated!
CODE SNIPPET:
// check to…
NoobDev954
- 119
- 1
- 3
- 11
7
votes
2 answers
how to search negative number in solr?
In solr I want to search one field with negative number like nodeId:-1.
in schema.xml, I defined it like this:
user1058984
- 73
- 1
- 4
7
votes
2 answers
C standard on negative zero (1's complement and signed magnitude)
All of these functions gives the expected result on my machine. Do they all work on other platforms?
More specifically, if x has the bit representation 0xffffffff on 1's complement machines or 0x80000000 on signed magnitude machines what does the…
tyty
- 839
- 5
- 12
7
votes
2 answers
Convert a raw negative rgb int value back to a 3 number rgb value
Ok so I'm working on a program that takes in an image, isolates a block of pixels into an array, and then gets each individual rgb value for each pixel in that array.
When I do this
//first pic of image
//just a test
int pix =…
shoconinja
- 195
- 1
- 3
- 11
7
votes
2 answers
processing negative number in "accounting" format
I have dataset, which negative value is presented with a bracket around the number i.e. (10)==-10, it is in csv format, how can I process it so that R will interpret the (10) as -10? Thank you.
UPDATE
I know I can work it out by replacing ( as -,…
lokheart
- 23,743
- 39
- 98
- 169
7
votes
2 answers
Understanding negative steps in list slicing
I am trying to understand the following behavior and would welcome any references (especially to official docs) or comments.
Let's consider a list:
>>> x = [1,2,3,4,5,6]
This works as expected
>>> x[-1:-4:-1]
[6, 5, 4]
But I am surprised the…
jarm
- 241
- 2
- 12
7
votes
2 answers
Negative zeros in Matlab
Basically I wanted to ask two things:
Why does this happen? (negative zero in Matlab)
When does this happen?
I came up with this. Octave has some similarities with Matlab, so the usefulness of this feature is clear, but one of the things they…
lazary
- 449
- 1
- 8
- 17
7
votes
5 answers
Unsigned negative primitives?
In C++ we can make primitives unsigned. But they are always positive. Is there also a way to make unsigned negative variables? I know the word unsigned means "without sign", so also not a minus (-) sign. But I think C++ must provide it.
Martijn Courteaux
- 67,591
- 47
- 198
- 287
7
votes
2 answers
Why does right shifting -1 always gives -1 in PHP?
I am trying to figure out why if I shift the negative integer -1 I always get -1, e.g.:
echo -1 >> 64; // -1
echo -1 >> 5; // -1
echo -1 >> 43; // -1
echo -1 >> 1; // -1
Whatever second operand of the right shift is given, -1 remains -1... I do…
tonix
- 6,671
- 13
- 75
- 136
7
votes
2 answers
how to convert negative hexadecimal to decimal
hi I want to know how it is possible to convert a hexadecimal negative value (to complement encoding) to decimal, easily without converting hexadecimal to binary and then multiplying each bit in by a power of 2 and sums all the value to get the…
KarimS
- 3,812
- 9
- 41
- 64
6
votes
1 answer
Using fmtlib, zero padded numerical value are shorter when the value is negative, can I adapt this behaviour?
I am using fmtlib to format strings and numeric values but I have problem with negative integers.
When I pad the value with zeroes, I expect a consistent number of zero no matter the sign of the value.
For instance, using a padding of 4, I would…
jeromes
- 497
- 5
- 17
6
votes
1 answer
Delphi Handle in negative
I am working on a project in delphi XE5.
Different Popup menus are created at run time using same function.
Names are given each time to pop up using "Handle" from Tcomponent class.
popupname := 'XYZ' + IntToStr(handle);
On some system I get…
poonam
- 748
- 4
- 19
- 40