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Improved doc for polynomial ring element constructors #2179

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Improved doc for polynomial ring element constructors #2179

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8cecaa6
Improved doc for polynomial ring element constructors
JohnAAbbott Oct 1, 2025
c3d5230
Now recommends map_coefficients over evaluation
JohnAAbbott Oct 6, 2025
19800b4
Update docs/src/polynomial.md
JohnAAbbott Oct 6, 2025
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7 changes: 6 additions & 1 deletion docs/src/polynomial.md
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Expand Up @@ -95,8 +95,13 @@ the usual ways of constructing an element of a ring.
(R::PolyRing)(c::elem_type(R))
(R::PolyRing{T})(a::T) where T <: RingElement
```
The third constructor above cannot be used to coerce a polynomial from one ring
to another; instead use a call like `map_coefficients(identity, f; parent=dest_ring))`,
or alternatively, for _small polynomials_ one can simply use evaluation:
namely, `f(y)` where `y` is the generator of the destination polynomial ring.
The fourth constructor creates a constant polynomial from an element of the coefficient ring.

For polynommials there is also the following more general constructor accepting
For polynomials there is also the following more general constructor accepting
an array of coefficients.

```julia
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