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Signal is a domain-specific programming language used for modeling and simulating digital signal processing algorithms. It’s an extension of the C++ programming language, adding features that allow users to write algorithms in a mathematically natural way, without sacrificing performance or low-level control over memory and execution. Signal includes advanced type systems for expressing mathematical structures like vectors and matrices, expression templates to avoid unnecessary temporary objects during complex expression evaluation, as well as algebraic loop optimizations that automatically vectorize or parallelize code when possible.

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