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I'm studying term-rewriting systems (and the K framework) as a way of expressing the semantics of programming languages, and I'd like to have a go at implementing a relational algebra engine in K.
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So it beats Alpaca's plugin in size
Already beats it in style and functionality so shouldn't be too hard.
s5bug updated
6 years ago
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So far DataJoint has not offered the union operator and the outer join operators. These two operators are closely related. I propose to implement outer join/union as the `+` operator.
## Syntax
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`integrate(1/(cos(t) + 2), (t,0,2*pi))` returns 0 instead of `2*pi/sqrt(3)`.
```py
>>> S('Integral(1/(cos(t) + 2), (t,0,2*pi))').doit()
0
>>> S('Integral(1/(cos(t) + 2), (t,0,2*pi))').n()
3.62759…
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The logic rules of Flix should be compiled to JVM bytecode via translations to relational-algebra like operators (SELECT, JOIN, PROJECT, etc. + an operator for our lattice semantics).
This project i…
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I can't seem to find any way to perform an anti-join (ie given [0,1,2,3] and [0,1] to get [2,3]).
I haven't seen quantifiers mentioned anywhere in the tutorial either, which I guess would be neces…
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cc @szdavid92
We had a discussion with @imbur today and concluded that the current naming is quite confusing as the `search` model (built by the `RelalgBuilder` class) does not define an actual se…
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Current stack allows to write this new syntax:
```
extra-deps:
- git: git@github.com:NorfairKing/validity.git
commit: a86dd3e4830c14c056a0d5d8712864d395d25b2a
```
the old syntax for this w…
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Hi!
Let's say that I want to compute X from the algebraic Riccati equation (ARE).
> A' * X + X * A - X * B * inv(R) * B' * X + Q = 0
I just do this:
> syms X
> X = solve(A' * X + X * A …
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Hey guys, how would you recommend I go about building API output formats other than FeatureServer? For instance, how would I output a GeoJSON file in the OData spec? I see clearly how I'd add a provid…