---
title: "mlab-table-display — Mova code model"
description: "Mova code model of mlab/src/table.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/mlab/src/table.rs.groupant/display.groupant/"
---
Elamur: [Mova](https://md.mova.elamur.ai/free/en/) · [Dictionary](https://md.dictionary.elamur.ai/free/en/) · [Research](https://md.research.elamur.ai/free/en/) · **Groupants**

This page as HTML: <https://groupants.elamur.ai/free/en/mova/mlab/src/table.rs.groupant/display.groupant/>

# mlab-table-display

The groupant beside mlab/src/table.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

- **kind:** groupant_fragment
- **status:** partial source bound model
- **source:** [`mlab/src/table.rs`](https://github.com/ElamurAI/mova-free/blob/main/mlab/src/table.rs)
- **source SHA-256:** `7af3a65aabe33226…`
- **covers:** cells_of formats by kind; format_body selects all rows <=30, otherwise head10 tail5, widths count Unicode chars and header. Text left aligns, others right; format_str_arr traverses column-major data into row text. (bytes 15045–18136)
- **part of:** [mlab-table](https://md.groupants.elamur.ai/free/en/mova/mlab/src/table.rs.groupant/)
- **repository folder:** [`mlab/src/table.rs.groupant/display.groupant`](https://github.com/ElamurAI/mova-free/tree/main/mlab/src/table.rs.groupant/display.groupant)
- **repository commit:** `855da7bd4a7b`

> **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](#approximant) |
| **ast** | partial | `../syntax.json` |
| **cost** | symbolic source derived | [invariant](#invariant) |
| **descriptant** | present | [descriptant](#descriptant) |
| **invariant** | partial | [invariant](#invariant) |
| **tests** | partial bounded parent evidence | [tests](#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](#behavior-complement) |
| `reverse_reconstruction` | reverse_reconstruction | partial source derived model | [reverse_reconstruction](#reverse-reconstruction) |
| `display_cost` | display_cost | partial source derived model | [display_cost](#display-cost) |
| `layout_transport` | layout_transport | partial source derived model | [layout_transport](#layout-transport) |
| `branch_relation` | branch_relation | partial source derived model | [branch_relation](#branch-relation) |
| `resource_cost` | resource_cost | partial source derived model | [resource_cost](#resource-cost) |

## Model text


### descriptant

#### mlab-table-display

cells_of formats by kind; format_body selects all rows <=30, otherwise head10 tail5, widths count Unicode chars and header. Text left aligns, others right; format_str_arr traverses column-major data into row text.

Epoch 2026-10-31: isolated source-bound fragment over bytes [15045,18136); includes no claim beyond this relation. Source hash 7af3a65aabe33226d39f741909fd08d74c3b3e43390417c64e617a10704ac26b.

### approximant

#### display: forward relation

cells_of formats by kind; format_body selects all rows <=30, otherwise head10 tail5, widths count Unicode chars and header. Text left aligns, others right; format_str_arr traverses column-major data into row text.

Domain: Well-shaped public Table/Mat/StrArr, in-range zero-based internal indices, bounded i64 civil arithmetic. Malformed direct structs may panic.

Executable surrogate gap: no measured cheaper implementation with a useful scoped metric is supplied. Categorical/error/effect relations are exact obligations, not percent losses. Future numeric caps only1/2/5/10%.

### invariant

#### display: invariant and cost

All cells generated before selection, so elision reduces output not source-format work.

Names and shown widths determine pad; trailing spaces stripped, four-space indent and three-space separators.

Scope-specific cost: O(all cell rendering bytes) memory/time before selecting displayed rows; output only head10+tail5 above30 rows.

### models

### behavior_complement

Elided output excludes reconstruction of hidden rows; nonfinite Date displays NaT and string None displays <missing>. No ANSI width guarantee.

### reverse_reconstruction

Display string admits many matrices differing beyond precision, elided middle rows or real literal <missing> text.

### display_cost

All cells generated before selection, so elision reduces output not source-format work.

### layout_transport

Names and shown widths determine pad; trailing spaces stripped, four-space indent and three-space separators.

### branch_relation

cells_of formats by kind; format_body selects all rows <=30, otherwise head10 tail5, widths count Unicode chars and header. Text left aligns, others right; format_str_arr traverses column-major data into row text.

### resource_cost

O(all cell rendering bytes) memory/time before selecting displayed rows; output only head10+tail5 above30 rows.

### tests

#### Evidence boundary

See ../tests.md for the actual selected source test and mutant. These tests sample the file, not every fragment branch. Elided output excludes reconstruction of hidden rows; nonfinite Date displays NaT and string None displays <missing>. No ANSI width guarantee. Other branches here are source-derived and unexecuted unless the parent test explicitly calls them.