Changelog

musicMCT (development version)

New point_on_flat() generates a concrete point on any given flat of a hyperplane arrangement.
ianring() gains is_interactive parameter which allows explicit control over whether the function opens a browser window (mainly to disable the browser during tests).
project_onto() now works for hyperplane arrangements that are not central, such as those from make_roth_ineqmat() and make_rosy_ineqmat().
scale_palette() gains an ineqmat parameter, which improves completeness of results for arrangements other than the modal color theory arrangement.
New move_to_hyerplane() finds the point where a chosen line and hyperplane intersect.

The function can now return a permutation matrix rather than a scale, which it does if set is NULL. New parameter card goes along with this change: it is necessary to specify the size of the permutation matrix if set is NULL.
Default value of parameter set is now NULL.
Change to the way a parameter is interpreted. It now gives the results that would have come from entering the inverse of a (modulo card). The new method enhances consistency with other standards and with the permutation matrix view of the function.
Changes to the internal logic of the function, emphasizing the role of permutation matrices in implementing the symmetries of the space.

CRAN release: 2025-11-03

brightness_comparisons() and brightnessgraph() gain a goal parameter that allows voice-leading brightness relationships between different sets to be studied.
New clampitt_q() finds the sets that are “Q-related” to an input (Clampitt 1997, 2007).
colornum() now tries to automatically match a signvector list to the specified ineqmat when the parameter signvector_list is NULL. (For instance, colornum(set, ineqmat="pastel") searches the global environment for pastel_signvectors.)
New fpmod() allows for safer modulo division in contexts with octave equivalence.
New inter_vlsig() finds elementary voice leadings between sets of different Tn-types.
New make_infrared_ineqmat() adds a new family of hyperplane arrangements for studying voice leading.
minimize_vl() now returns better results when method="hamming" by allowing for voice crossings (#4).
primary_colornum() gains a signvector_list parameter to pass to colornum(), allowing it to work properly for hyperplane arrangements other than the “modal color theory” arrangement.
Parameter n for tni() gains a default value of NULL, in which case the index n is chosen to create the contextual inversion which keeps the first and last entries of set fixed.
vl_generators() now gives correct results for sets which fail optc_test().
vlsig() parameter index now defaults to NULL, returning a matrix of all elementary voice-leadings.

New normal_form() calculates the normal form of a set under any combination of OPTIC symmetries, following the algorithm described by Hook (2023, 416-8).
Set theory functions including tn(), tni(), startzero(), and so on gain an optic parameter, which allows the user to specify the OPTIC symmetries to consider.

New make_anaglyph_ineqmat() allows construction of a new family of hyperplane arrangements (anaglyph arrangements) which study voice leadings between sets of different set classes.
New anazero_fingerprint() provides granular information about the types of hyperplanes that a pair of sets lie on in the anaglyph arrangement.
New behavior for howfree() and colornum() because anaglyph arrangements require special handling.

CRAN release: 2025-07-21

New make_black_ineqmat() and make_gray_ineqmat() allow new transposition-sensitive hyperplane arrangements to be studied; ineqmat parameter for other functions (e.g. signvector() now accepts “black” and “gray” as options.
New make_offset_ineqmat() creates version of standard ineqmats (MCT, white, black, etc.) which have been translated to be centered on an arbitrary set.
Creation functions for ineqmats (makeineqmat(), make_black_ineqmat(), make_white_ineqmat(), make_roth_ineqmat()) now return a consistent value (integer(0)) rather than various errors when card is small.
New data set roth_ineqmats.rda with precomputed results from make_roth_ineqmat(); accessed with new get_roth_ineqmat().
New data sets for pastel and white arrangements (for cardinalities <= 6) uploaded to modalcolortheory repository and linked in the documentation for make_white_ineqmat().

Affected functions are quantize_color(), quantize_hue(), and set_from_signvector().
Upon failure, quantization functions now return a result whose format matches expected success format depending on value of reconvert parameter. That is, if reconvert=TRUE, failure to quantize results in a NA vector (as before), but if reconvert=FALSE, failure to quantize results in a list with entries set and edo, both of which are NA.
Quantization functions gain a target_edo parameter, which allows user to search for desired scales in a specific edo rather than all possible edos.

New clockface() offers a simple plotting mechanism to visualize sets on a pitch-class clockface (with numbers corresponding to any equal temperament).
New ianring() creates a convenient way to open a browser window to information about the input set on Ian Ring’s website The Exciting Universe of Music Theory.
New functions for basic applications of the DFT to set theory are added. These include set_to_distribution(), distribution_to_set(), and dft().

brightnessgraph() now returns an invisible copy of the igraph graph object underlying the plotted brightness graph, instead of an invisible NULL.
sim() gains a goal parameter, which allows it to calculate the interscalar interval matrix for two sets.
vl_generators() now throws a warning instead of an error when set is perfectly even, returning a 2-by-0 matrix.

CRAN release: 2025-06-05