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Questions tagged [inversion]

The inversion tag is most often used with postings about matrix inversion or data transformations of a similar nature such as color inversion. In addition to the [inversion] tag, you should also specify a tag that indicates the nature of the inversion such as [matrix] or [colors] as most people will do a search not only on the tag [inversion] but also a qualifying tag indicating the kind of inversion.

Inversion in a sequence (A1 . . . An) of n distinct numbers is a pair (i, j) such that i < j and Ai > Aj.
Inversion number of a sequence is one common measure of its sortedness.

Inversion is a general purpose tag indicating a type of transformation to data whether that data is in the form of a matrix, an image (can be considered a matrix of pixels with color values), or some other form of structured data.

When using the [inversion] tag also provide a qualifying tag such as [matrix] or [colors] or other tag which indicates the kind or type of data that is being inverted.

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Swapping the Polarity in a UCF File (or even in the VHDL...)

I have a piece of hardware connected to an FMC, I know for a fact that there is a design fault and the hardware has a polarity inversion along the FMC pins. I want to simply try and quickly correct for this. I tried doing it in the project, on the…
fiz
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Inversion count value of inversion in merge sort

The following below is a code to count inversions in a an array.I have a doubt in this part: inv_count = _mergeSort(arr, temp, left, mid);--i inv_count += _mergeSort(arr, temp, mid+1, right);--ii inv_count += merge(arr, temp, left,…
swapedoc
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Understanding function which inverts binary representation of even number

I recently stumbled upon this function which inverts binary representation of even numbers,but I'm not able to understand the logic behind the code? int binaryReverse(int toReverse) { int reversed = 0; while(toReverse > 0) { …
Always_Beginner
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Is there a standard library implementation of MPI inverse matrix calculation problem?

Is MPI implementation of matrix inversion a standard library routine or good MPI implementation critically depends on your setup(software/hardware) so have to be coded by yourself.
hahaha
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confirmation of my Counting inversion experiment

I have written a mergesort(divide and conquer) algorithm and I want to use the following arrays to test if the inversion works efficiently.. So, i would just want to confirm the inversion for each of the following arrays . 1. {10,2,3,22,33,7,4,1,2}…
helpdesk
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Counting inversions in a string

im new to python taking my first class and im doing very well so far, but this problem is killing me, I would appriciate any help i can get. Problem: An inversion in a sequence is a pair of entries that are out of order. For example, the…
Snarre
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Wrong inversions and duplicate numbers in MergeSort implementation in Java

I'm creating a Java program in which I implement the MergeSort algorithm. My code is the following (so far): public void merge(Integer [] left, Integer[] right, Integer[] a) { int i = 0; // a[] index (A) int lIndex = 0; …
Lefteris008
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Sparse Matrix Editing

I'm new here so I'm not sure if it's asked before, but I did look out to see if it's there. I'm interested if anyone has encountered similar problem. I have sparse matrix that is being LU decomposed and than those L and U factors are than inverted.…
Aranđel Šarenac
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Count inversion in python (for large integer array)

I making a program for count inversion in pyhton and using python27 for the same. I have implement the alogorithm using divide and conquer technique(merge sort trick). My program runs fine for an input array of size uptill 100 (that's the max I…
nishant mehta
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color inversion between two colors

I have a logo which contains shades of a green on a white background (and some other pale color shades, mostly gray). What I want to do is to `invert' the colors, this is, white should become green, and green should become white, and the shades…
lemzwerg
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Render Inversion template from hash

Is it possible to render an Inversion template from a hash? And if not, how does one construct a complex template corresponding to a hash such as: { :a => [ { :b => 'foo', :c => 'bar' }, { :d => 'blah', :e => 'blubb'} ] } Unfortunately the user…
christina
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Is it that hard to translate python code into c code?

once I wrote a piece of python code to do the calculation of inversions. And just for fun plus want to see if c is really way faster than runtime language, I wrote the similar python code in c. the python code took less than 3 secs to run, but my c…
pochen
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How to store a certain value when running function multiple times through another function

My problem is that I have two functions and one of the functions calls the other and because it does this several of times(rec), i want to save the value im getting in the second function (callled Mergesort in my case). I'm actually sorting a list…
John
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Ignore line if any non-matching character is present

I'm trying to print lines from a file if, and only if, every character in a line meets a certain regex condition. The problem is that any line that contains any character that meets the regex condition evaluates to true and gets printed, even if it…
personguy
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in array A, we have an inversion (i, j). why do we have at least j-i inversions in array?

we have an array A that : in array A exist a pair (i, j) that iA[j]. why do we have at least j-i inversions in array A?
Amirsadra Abdollahi
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