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Flouring the loaf

Now here’s a task that cries out for a simple solution: put a border round a matrix. My matrix is boolean and represents a QR code (yes, we’ll come to that) but it’s the same problem as, say, putting a 1px border on an image. So let’s examine it as w...

SJT by Contributor III
  • 1 replies
  • 3 kudos

When to do nothing

A common beginner mistake is to specify iteration when it is already implicit in q’s operators and keywords. This is a shame, because implicit iteration is almost always the fastest – and speed is what you came for, right? A new article on

SJT by Contributor III
  • 2 replies
  • 3 kudos

Missing some items

We encounter the enlist keyword early in learning q; a reliable way to make a one-item list where 1# won’t do. But there is a bit more to enlist than that. In the first place, it is not only variadic – taking various numbers of arguments – it will ta...

SJT by Contributor III
  • 1 replies
  • 2 kudos