Elamur Groupantsmlab-value-transpose-layout
The groupant beside mlab/src/value.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.
Facts
Implementation material. A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised.
Components
| component | label | where |
|---|---|---|
| approximant | partial | approximant |
| ast | partial | ../syntax.json |
| cost | symbolic source derived | invariant |
| descriptant | present | descriptant |
| invariant | partial | invariant |
| tests | executed bounded checks | tests |
Obernants
The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.
| id | type | label | where |
|---|---|---|---|
behavior_complement | behavior_complement | partial source derived model | behavior_complement |
reverse_reconstruction | reverse_reconstruction | partial source derived model | reverse_reconstruction |
representation_transport | representation_transport | partial source derived model | representation_transport |
failure_precedence | failure_precedence | partial source derived model | failure_precedence |
resource_domain | resource_domain | partial source derived model | resource_domain |
interaction_relation | interaction_relation | partial source derived model | interaction_relation |
Model text
descriptant
Matrix transpose permutation
For r×c matrix, T.re[ic+j]=M.re[jr+i], same for optional im; output shape c×r and identical class.
Modeling epoch 2026-10-31
Prospective source reading precedes test additions. Retained observations: ops::transpose applies optional conjugation after this permutation; core reshape instead changes shape only.
This is partial source-derived modeling, not proof, full semantic coverage, or a performance result. Public malformed representations, unbounded allocations and exhaustive numerical edge cases remain outside the checked fixtures.
approximant
Matrix transpose permutation forward relation
For r×c matrix, T.re[ic+j]=M.re[jr+i], same for optional im; output shape c×r and identical class.
Domain: Valid buffers and bounded dimension product; no checked allocation interface.
No executable Rust surrogate is supplied: categorical decisions require exact observations; numerical kernels have no measured approximation metric here. Future supported caps are 1%, 2%, 5%, 10% only.
invariant
Invariant and cost
Transpose twice restores dimensions, values, class and optional im. Empty shapes swap even without cells.
Cost: O(r*c) time/new storage for each present component.
Failure ordering: Real buffer allocated/permuted before optional imaginary buffer; no narrow call.
models
behavior_complement
For consistent lengths T excludes conjugation, dropping im, or unchanged flattened order on nonsymmetric rectangular input.
reverse_reconstruction
T^-1(Y)={Y.transpose()} for well-formed buffers and recorded class/im representation. No uniqueness of original allocation identity.
representation_transport
Transpose twice restores dimensions, values, class and optional im. Empty shapes swap even without cells.
failure_precedence
Real buffer allocated/permuted before optional imaginary buffer; no narrow call.
resource_domain
Valid buffers and bounded dimension product; no checked allocation interface.
interaction_relation
ops::transpose applies optional conjugation after this permutation; core reshape instead changes shape only.
tests
Bounded evidence
Selected actual-code Rust test: value::wave30::layout with cargo test --offline --locked -p mlab --lib. CPU synthetic fixtures only. Two debug and two release runs, sorted named outcomes, numeric statuses, compiled assertion controls and exact source restoration are retained externally under the wave30 expressions receipt directory. The source-to-test map distinguishes runtime semantics from AST representation checks. This fragment shares the parent test: only the exercised branches are observed; its whole prose is not runtime coverage. No corpus, GPU, live filesystem inspection, callbacks, RNG shuffle or wall-clock execution.
Syntax is generated twice from exact source and compared. Lexical projection has no expansion/type/name resolution. No strict Clippy claim; existing dependency/style findings are not re-run merely for repetition.
This page in Markdown → https://md.groupants.elamur.ai/free/en/mova/mlab/src/value.rs.groupant/transpose-layout.groupant/