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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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How do I return current index of an element in java?

A pair of positions [i, j] with the property that i < j and A[i] ≥ A[j] (i.e. an inversion), such that A[i] − A[j] is the maximum possible among all inversions in A. class Main { static int[] diff(int arr[], int n){ int index1=0; …
TIGUZI
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Java array/inverse novice

I'm a novice at java language, and I had a problem that I have to solve, I'm fairly sure that I've done it right yet the tester still crashes. a brief summary of what if has to do is " Inside an array a, an inversion is a pair of positions i and j…
Heitor Purcino
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Algorithm Number of Inversions (Python)

I'm attempting to complete a code assignment for the Algorithmic Toolbox offered by UC San Diego on Coursera. The assignment requires that you count the number of inversions in a sequence of numbers using a variation of the merge-sort algorithm. …
roadrunner007
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Matrix inversion in python: bottom diagonal always wrong

I am writing a program that inverts an n*n dimensional square matrix without explicit dependence on the numpy.linalg.inv function, however the bottom left triangular matrix is always incorrect, whereas the rest of the matrix elements are always…
K4YM3Z
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How can I reverse the colors of an image with the tool ColorMatrix?

What values do I have to put in the Matrix? Dim clMatriz As Imaging.ColorMatrix = New Imaging.ColorMatrix(New Single()() _ {New Single() {¿?, 0, 0, 0, 0}, _ New Single() {0, ¿?, 0, 0, 0}, _ New Single() {0, 0, ¿?, 0, 0}, _ New Single() {0, 0, 0,…
Diego
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Counting Version algorithm with merge function

Im trying to code the optimal version of the counting version algorithm. I'm having this error in line 84: int object is not iterable. But I can't figure out why i'm having this issue. Function mergesort: Merge a list of number in increasing order…
user5335342
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Memory issue when calculating matrix inverse by C++

I am now using some c++ code to compute matrix inverse and the matrix is stored in a two-dimensional array. However, I met some possible memory issues that I had no idea how to fix it. Sometimes, I can get good return while sometimes error occurs.…
ZZ32
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Would it be possible to override system-made accessibility screen settings such as inverted colors?

Let's say I want to have text only be visible once the screen colors are inverted in a native Android application. To do this: Set the text color to the background color, white for example. Listen for the invert colors being enabled. Once it's…
Ali Bdeir
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I need to print an invert of my array

I have an a program that asks the user to enter true or false and then it puts the input in a 5x3 array. I have to then, using methods, print the area, then make another method to invert it, then another to print the invert. This is my code so far:…
Ryan Asciutto
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Pascal - Enhanced Merge Sort for inversion count wrong output

I've got a homework from school to create a project that would count inversions in an array of integers. I first tried to bruteforce it, but as I expected, I didn't pass the time limit. So after some googling and trying to fully understand mergeSort…
Samuel Novelinka
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How do I invert an integer around a selected number point

I want to essentially be able to have a function swap where I can enter 2 arguments. The first would be the central point, the point of inversion so to speak, while the second would be the number I want to find the opposite of, with respect to the…
Andrew I
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The way to compute the inversion of a iteratively increased matrix in Matlab

For example, I have to compute the matrix A\B and the size of A and B is 3*3. After the first iteration, the size of the matrix become 4*4, however, the elements at (i,j) where i,j <= 3 are unchanged and the new data will be added to the location…
Zhida Deng
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Counting inversions in a linked-list with O(n log n) running time

I've created a very simple linked list in Java: public class LinkedList { class Node { public Node next; public int item; public Node (int item) { this.item = item; } } int listSize = 0; …
TheSaviour
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select the inverse of sql result as a string list

having a sql e.g. something like the following resulting in some rows with one value. I search a different sql than SELECT * FROM some_sql which results in one row with comma separated values. WITH some_sql AS ( SELECT 1 FROM DUAL UNION …
bw_üezi
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Given two ranges,find for each element in the first range,the number of elements greater than that in the second range

The given array is a permutation of first n integers.We are given two ranges [l1,r1] &[l2,r2] . We have to find, for each element a[i] in the first range; the number of elements in the second range which are greater than that. (Length of both the…
HKedia
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