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math_28

Utree
May 08, 2019

 math_28

Utree

May 08, 2019
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  1. ૬ؔ܎਺ ૬ؔ܎਺ = ∑n i=1 (xi − x)(yi − y)

    ∑n i=1 (xi − x)2 ∑n i=1 (yi − y)2 ม਺YZʹ͍ͭͯɺͲͷఔ౓ؔ࿈ੑ͕ڧͦ͏͔
  2. ૬ؔ܎਺ ૬ؔ܎਺ = ∑n i=1 (xi − x)(yi − y)

    ∑n i=1 (xi − x)2 ∑n i=1 (yi − y)2 o y x ฏۉ஋ ੺৭ͷκʔϯʹͲΕ͚ͩ఺͕ू·͍ͬͯΔ͔ʁ ૬ؔ܎਺Λ-1ʙ1ʹ͢Δ
  3. ૬ؔ܎਺ίαΠϯͰද͢ ૬ؔ܎਺ = ∑n i=1 (xi − x)(yi − y)

    ∑n i=1 (xi − x)2 ∑n i=1 (yi − y)2 ɹɹɹɹ = p ⋅ q ∥p∥∥q∥ ɹɹɹɹ = ∥p∥∥q∥ cos θ ∥p∥∥q∥ ɹɹɹɹ = cos θ p = (x1 − x, x2 − x, ⋯, xn − x) q = (y1 − y, y2 − y, ⋯, yn − y) p ⋅ q = n ∑ i=1 (xi − x)(yi − y) ∥p∥ = n ∑ i=1 (xi − x)2 ʹ͓͍ͯ ΑΓ