python matrix condensed to square

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

answer python matrix condensed to square

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python matrix condensed to square

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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

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Source: stackoverflow.com

Tags: matrix python square

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Contributed on Aug 05 2020

Better Butterfly

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python matrix condensed to square

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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

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Source: stackoverflow.com

Tags: square matrix python

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Better Butterfly

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python matrix condensed to square

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

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Source: stackoverflow.com

Tags: matrix square python

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Contributed on Aug 05 2020

Better Butterfly

0 Answers Avg Quality 2/10

python matrix condensed to square

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