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What you need is actually the (?) vector conditional operator: https://code.kx.com/q/ref/vector-conditional/
? accepts a boolean list as the first argument but $ accepts a boolean atom. Think of ? as a boolean mask.
What you need is actually the (?) vector conditional operator: https://code.kx.com/q/ref/vector-conditional/
? accepts a boolean list as the first argument but $ accepts a boolean atom. Think of ? as a boolean mask.
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