Changelog • musicMCT

musicMCT (development version)

vl_generators() now gives correct results for sets which fail optc_test()
minimize_vl() now returns better results when method="hamming" by allowing for voice crossings (#4).
brightness_comparisons() and brightnessgraph()gain a goal parameter that allows voice-leading brightness relationships between different sets to be studied.
New fpmod() allows for safer modulo division in contexts with octave equivalence.
New clampitt_q() finds the sets that are “Q-related” to an input (Clampitt 1997, 2007).
vlsig() parameter index now defaults to NULL, returning a matrix of all elementary voice-leadings.
New inter_vlsig() finds elementary voice leadings between sets of different Tn-types.
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.
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.
New make_infrared_ineqmat() adds a new family of hyperplane arrangements for studying voice leading.

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 normal_form() calculates the normal form of a set under any combination of OPTIC symmetries, following the algorithm described by Hook (2023, 416-8).

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