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What is the difference between assignment, setlength and renewcommand when changing a variable?

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3 I want to set the extrarowheight to 0.5ex . I find the following three ways are all applicable. extrarowheight = 0.5ex setlength{extrarowheight}{0.5ex} renewcommand{extrarowheight}{0.5ex} Just out of curiosity, which way is the canonical one? macros lengths share | improve this question edited Dec 11 '18 at 14:18 Martin Scharrer ♦ 199k 45 632 816 asked Dec 11 '18 at 6:03 Eli4ph Eli4ph 65 7 ...