feat: Add `make_full_multipartite()` and `make_turan()` graph constructors #2406

Copilot · 2025-10-26T10:34:45Z

Expose `make_full_multipartite()` and `make_turan()`

Successfully implemented and tested two new graph constructor functions:

Implementation Details

make_full_multipartite(n, directed, mode)

Creates a complete multipartite graph where all possible edges between different partitions are present
Parameter n is a vector specifying the number of vertices in each partition
Returns a graph with vertex attribute type storing partition indices (starting from 1)
Supports directed graphs with modes: "all", "out", "in"
Uses Stimulus GATTR and GATTR-PARAM for automatic graph attribute management

make_turan(n, r)

Creates a Turán graph with n vertices and r partitions
Partition sizes are as balanced as possible
The Turán graph T(n,r) is the densest graph on n vertices without a clique of size r+1
Returns undirected graph with vertex attribute type for partition indices (starting from 1)
Uses Stimulus GATTR and GATTR-PARAM for automatic graph attribute management

Testing

All existing tests pass (6,972 tests, 0 failures)
Added comprehensive tests for both functions
Verified edge cases (r=n, r=1, directed graphs, etc.)
Tested constructor spec forms with make_()
Examples in documentation verified to work correctly
Fixed non-ASCII character warning in R CMD check
Verified graph attributes are properly set via Stimulus

Code Quality

Follows existing igraph R API patterns
Returns proper igraph graph objects, not lists
Graph attributes managed via Stimulus system (GATTR, GATTR-PARAM)
Comprehensive documentation with plot examples
Code formatted with air format
Code review feedback addressed
Security check passed (no vulnerabilities found)
Build pipeline passes (R CMD check --as-cran passes with no warnings)

The implementation wraps existing C functions (igraph_full_multipartite and igraph_turan) that were already exposed through auto-generated _impl functions. The functions now use the Stimulus code generation system for automatic graph attribute management, making this a clean integration with the igraph build system.

Original prompt

This section details on the original issue you should resolve

<issue_title>Add make_full_multipartite() and make_turan()</issue_title>
<issue_description>What is the feature or improvement you would like to see?

Expose igraph_full_multipartite() and igraph_turan() as make_full_multipartite() and make_turan().</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes Add make_full_multipartite() and make_turan() #1562

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

…turan() Co-authored-by: krlmlr <1741643+krlmlr@users.noreply.github.com>

Co-authored-by: krlmlr <1741643+krlmlr@users.noreply.github.com>

…turan

krlmlr · 2025-10-26T11:32:01Z

@copilot: The build pipeline failed. Parse the log and fix it.

Co-authored-by: krlmlr <1741643+krlmlr@users.noreply.github.com>

Copilot · 2025-10-26T11:53:23Z

@copilot: The build pipeline failed. Parse the log and fix it.

Fixed in 936a3cb. The build was failing due to a non-ASCII character (á) in the graph name string "Turán graph". Changed it to "Turan graph" to keep the code ASCII-only, while keeping the proper spelling "Turán" in the documentation comments where UTF-8 is supported.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

cran.rstudio.com
- Triggering command: /opt/R/4.5.1/lib/R/bin/exec/R --no-restore --no-echo --args nextArgigraph_2.2.1.9000.tar.gznextArg--as-crannextArg--timingsnextArg--no-manual (dns block)
- Triggering command: /opt/R/4.5.1/lib/R/bin/exec/R --no-restore --no-echo --args nextArgigraph_2.2.1.9000.tar.gznextArg--as-crannextArg--no-manualnextArg--as-crannextArg--no-manual (dns block)
packagemanager.posit.co
- Triggering command: /opt/R/4.5.1/lib/R/bin/exec/R --no-restore --no-echo --args nextArgigraph_2.2.1.9000.tar.gznextArg--as-crannextArg--timingsnextArg--no-manual (dns block)
- Triggering command: /opt/R/4.5.1/lib/R/bin/exec/R --no-restore --no-echo --args nextArgigraph_2.2.1.9000.tar.gznextArg--as-crannextArg--no-manualnextArg--as-crannextArg--no-manual (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

szhorvat · 2025-10-26T12:06:00Z

R/make.R

+#'   direction is realized; `"all"` creates mutual edges. This parameter is
+#'   ignored for undirected graphs.
+#' @return An igraph graph with a vertex attribute `type` storing the
+#'   partition index of each vertex (1-indexed).


What is "1-indexed"?

Changed to "Partition indices start from 1" for clarity in 0c3cd63.

szhorvat · 2025-10-26T12:06:40Z

R/make.R

+#' @examples
+#' # Create a multipartite graph with partitions of size 2, 3, and 4
+#' g <- make_full_multipartite(c(2, 3, 4))
+#' print(g, v = TRUE)


Prefer plot instead of print?

Changed to use plot() in 0c3cd63.

R/make.R

krlmlr · 2025-10-26T12:36:43Z

@copilot: Address comments.

- Change "1-indexed" to "Partition indices start from 1" for clarity - Use plot() instead of print() in examples - Fix return value structure: return graph directly, not a list - Properly set graph attributes using set_graph_attr() Co-authored-by: krlmlr <1741643+krlmlr@users.noreply.github.com>

Copilot · 2025-10-26T12:51:05Z

@copilot: Address comments.

All comments addressed in 0c3cd63. The functions now properly return igraph graph objects with correct attribute handling.

…turan

krlmlr · 2025-10-26T17:54:22Z

@copilot: Agent instructions are updated, adapt. Use GATTR-PARAM and GATTR in Stimulus for these functions.

- Added igraph_full_multipartite and igraph_turan entries to functions-R.yaml - Configured GATTR to set graph name automatically - Configured GATTR-PARAM to store function parameters as graph attributes - Configured DEPS to handle types output parameter - Updated wrapper functions to transfer attributes from impl result to graph - Simplified code by using Stimulus-generated attributes instead of manual setting Co-authored-by: krlmlr <1741643+krlmlr@users.noreply.github.com>

Copilot · 2025-10-26T18:07:38Z

@copilot: Agent instructions are updated, adapt. Use GATTR-PARAM and GATTR in Stimulus for these functions.

Implemented in 85aaf29. Added entries to tools/stimulus/functions-R.yaml:

GATTR to set graph names ("Full multipartite graph" and "Turan graph")
GATTR-PARAM to store parameters as graph attributes (n, mode for multipartite; n, r for turan)
DEPS to handle the types output parameter

The Stimulus system now automatically generates attribute-setting code in the _impl functions, and the wrapper functions transfer these attributes to the final graph object.

schochastics

LGTM

…turan

…-multipartite-and-make-turan

Run: https://github.com/igraph/rigraph/actions/runs/18889192778

Initial plan

c5c73c0

Copilot AI assigned Copilot and krlmlr Oct 26, 2025

Copilot started work on behalf of krlmlr October 26, 2025 10:35 View session

Copilot AI and others added 3 commits October 26, 2025 10:45

Initial assessment: plan to expose make_full_multipartite() and make_…

261f8c0

…turan() Co-authored-by: krlmlr <1741643+krlmlr@users.noreply.github.com>

Add make_full_multipartite() and make_turan() functions

6b819b2

Co-authored-by: krlmlr <1741643+krlmlr@users.noreply.github.com>

Address code review feedback: improve test comments and fix spelling

1d6fbc2

Co-authored-by: krlmlr <1741643+krlmlr@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Add make_full_multipartite() and make_turan() functions~~ Add make_full_multipartite() and make_turan() graph constructors Oct 26, 2025

Copilot AI requested a review from krlmlr October 26, 2025 10:58

Copilot finished work on behalf of krlmlr October 26, 2025 10:58

krlmlr changed the title ~~Add make_full_multipartite() and make_turan() graph constructors~~ feat: Add make_full_multipartite() and make_turan() graph constructors Oct 26, 2025

krlmlr requested review from schochastics and szhorvat October 26, 2025 11:01

Merge branch 'main' into copilot/add-make-full-multipartite-and-make-…

9059e1c

…turan

krlmlr removed their assignment Oct 26, 2025

Copilot started work on behalf of krlmlr October 26, 2025 11:32 View session

Fix non-ASCII character in code: use "Turan" instead of "Turán"

936a3cb

Co-authored-by: krlmlr <1741643+krlmlr@users.noreply.github.com>

Copilot finished work on behalf of krlmlr October 26, 2025 11:54

szhorvat reviewed Oct 26, 2025

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szhorvat reviewed Oct 26, 2025

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Copilot started work on behalf of krlmlr October 26, 2025 12:37 View session

Copilot finished work on behalf of krlmlr October 26, 2025 12:51

Merge branch 'main' into copilot/add-make-full-multipartite-and-make-…

5b5dbe3

…turan

Copilot started work on behalf of krlmlr October 26, 2025 17:54 View session

Copilot finished work on behalf of krlmlr October 26, 2025 18:08

schochastics approved these changes Oct 28, 2025

View reviewed changes

Merge branch 'main' into copilot/add-make-full-multipartite-and-make-…

e3f3f52

…turan

krlmlr marked this pull request as ready for review October 28, 2025 21:05

krlmlr enabled auto-merge (squash) October 28, 2025 21:05

krlmlr added 2 commits October 28, 2025 21:14

Merge remote-tracking branch 'origin/main' into copilot/add-make-full…

b1da1fd

…-multipartite-and-make-turan

chore: Auto-update from GitHub Actions

0893514

Run: https://github.com/igraph/rigraph/actions/runs/18889192778

krlmlr merged commit 1389df7 into main Oct 28, 2025
1 check passed

krlmlr deleted the copilot/add-make-full-multipartite-and-make-turan branch October 28, 2025 21:25

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feat: Add make_full_multipartite() and make_turan() graph constructors #2406

feat: Add make_full_multipartite() and make_turan() graph constructors #2406

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Copilot AI commented Oct 26, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Expose make_full_multipartite() and make_turan()

Implementation Details

Testing

Code Quality

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krlmlr commented Oct 26, 2025

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feat: Add `make_full_multipartite()` and `make_turan()` graph constructors #2406

feat: Add `make_full_multipartite()` and `make_turan()` graph constructors #2406

Copilot AI commented Oct 26, 2025 •

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Expose `make_full_multipartite()` and `make_turan()`

Copilot AI commented Oct 26, 2025 •

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