๊ธฐ์กด์๋ .info()๋ฅผ ์ด์ฉํด ๊ฒฐ์ธก์น๊ฐ ์กด์ฌํ๋์ง ์ฌ๋ถ์ ์ผ๋ง๋ ๊ฒฐ์ธก์น๊ฐ ์๋์ง ์์น๋ก ๊ฐ๋จํ ์ดํด๋ดค์์.missingno๋ผ๋ ํจํค์ง๋ฅผ ์ด์ฉํด matrix๋ฅผ ๊ทธ๋ฆฌ๋ฉด ๊ฒฐ์ธก์น๋ ์๊ฐํํด์ ์ดํด๋ณผ ์ ์์.๊ฒฐ์ธก์น๊ฐ ์๋ค๊ณ ํ๋จํ ์ด์ ?isnull()๋ก ํ์ธํ์ ๊ฒฝ์ฐ ->
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