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how to put accent on some character such as x^hat

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I want to put hat (^) on some charater. It is a common notation to show some variables are estimated.

I  tried html tag but it did not work:

in Help by

1 Answer

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HTML is the right way to go, however, the <hat> tag is  HTML 5 whereas yEd supports only HTML 3.2. Thus you need to use the appropriate entity instead of a tag:

x-bar = x&#772; or x&#x0304;
p-hat = p&#770; or p&#x0302;

by [yWorks] (141k points)
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