# Create a top hat function

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Jason on 28 Jun 2021
Commented: Jason on 28 Jun 2021
Hello, Im trying to create a top hat function (that is 0 everywhere except between -halfpix & halfpix). the fucll width of the top hat (2* halfpix) is symetrical about the yaxis.
i've created it based in discrete values as below but I would like it as a general function.
x = -20:0.1:20;
t = zeros(1,length(x))
t(x>=-halfpix & x<halfpix) = 1;

Rik on 28 Jun 2021
If you realize that you are marking all true locations with 1 and leaving all false as 0, you can use that to make an anonymous function that only casts you logical statement to double.
Rik on 28 Jun 2021
You already know how to do that. You already used the code in your own question:
t=@(x) double(x>=-halfpix & x<halfpix)
Jason on 28 Jun 2021
Perfect, thankyou

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