The Dyalog Blog

Zero-length Regular Expression Matches Considered Harmful

In: APL Language, Tips and Tricks

I was asked by a colleague why ⎕S reports two matches in the following example: ('d*'⎕S 0 1)'321' ┌───┬───┐ │0 3│3 0│... Read

By

Richard Smth

February 2015

Solving the 2014 APL Problem Solving Competition – Cryptography Problem 3

In: Algorithms, APL Language, APL Problem Solving Competition

This post is the continuation of the series where we examine some of the problems selected for the 2014 APL Problem Solving Competition. In this post... Read

By

Jay Foad

February 2015

Solving the 2014 APL Problem Solving Competition – Cryptography Problem 2

In: Algorithms, APL Language, APL Problem Solving Competition

This post is the continuation of the series where we examine some of the problems selected for the 2014 APL Problem Solving Competition. In this post... Read

By

Jay Foad

January 2015

Solving the 2014 APL Problem Solving Competition – Cryptography Problem 1

In: Algorithms, APL Language, APL Problem Solving Competition

This post is a continuation of the series where we examine some of the problems selected for the 2014 APL Problem Solving Competition. I’ll start by... Read

By

Jay Foad

January 2015

The Diamond Kata

In: Algorithms, APL Language

Acknowledgments Morten Kromberg is the other co-author of this text but the blogging software prevents his being listed as such. We are indebted to Jay Foad,... Read

By

Roger Hui

January 2015

Cholesky Decomposition

In: APL Language

Morten was visiting Dyalog clients and forwarded a request: Can we have the Cholesky decomposition? If A is a Hermitian, positive-definite matrix, its Cholesky... Read

By

Roger Hui

January 2015

Zero-length Regular Expression Matches Considered Harmful

By

Richard Smth

Solving the 2014 APL Problem Solving Competition – Cryptography Problem 3

By

Jay Foad

Solving the 2014 APL Problem Solving Competition – Cryptography Problem 2

By

Jay Foad

Solving the 2014 APL Problem Solving Competition – Cryptography Problem 1

By

Jay Foad

The Diamond Kata

By

Roger Hui

Cholesky Decomposition

By

Roger Hui

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