Breaking News: Grepper is joining You.com. Read the official announcement!

python matrix condensed to square

Better Butterfly answered on August 5, 2020 Popularity 2/10 Helpfulness 1/10

answer python matrix condensed to square

related python matrix condensed to square

python matrix condensed to square

Comment

import math

def calc_row_idx(k, n):
    return int(math.ceil((1/2.) * (- (-8*k + 4 *n**2 -4*n - 7)**0.5 + 2*n -1) - 1))

def elem_in_i_rows(i, n):
    return i * (n - 1 - i) + (i*(i + 1))//2

def calc_col_idx(k, i, n):
    return int(n - elem_in_i_rows(i + 1, n) + k)

def condensed_to_square(k, n):
    i = calc_row_idx(k, n)
    j = calc_col_idx(k, i, n)
    return i, j

Popularity 2/10 Helpfulness 1/10 Language python

Source: stackoverflow.com

Tags: matrix python square

Link to this answer
Share Copy Link

Contributed on Aug 05 2020

Better Butterfly

0 Answers Avg Quality 2/10

Closely Related Answers

python matrix condensed to square

Comment

def square_to_condensed(i, j, n):
    assert i != j, "no diagonal elements in condensed matrix"
    if i < j:
        i, j = j, i
    return n*j - j*(j+1)//2 + i - 1 - j

Popularity 2/10 Helpfulness 1/10 Language python

Source: stackoverflow.com

Tags: square matrix python

Link to this answer
Share Copy Link

Contributed on Aug 05 2020

Better Butterfly

0 Answers Avg Quality 2/10

python matrix condensed to square

Comment

>>> square_to_condensed(1, 2, len(points))
3
>>> dist_condensed[3]
4.4721359549995796
>>> dist[1,2]
4.4721359549995796

Popularity 3/10 Helpfulness 1/10 Language python

Source: stackoverflow.com

Tags: square python matrix

Link to this answer
Share Copy Link

Contributed on Aug 05 2020

Better Butterfly

0 Answers Avg Quality 2/10

python matrix condensed to square

Contents

More Related Answers

python matrix condensed to square

Closely Related Answers

python matrix condensed to square

python matrix condensed to square

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.