Chord Diagram (Circular Plots)

This is a single function to plot unshaded chord diagrams: https://en.wikipedia.org/wiki/Chord_diagram

Easily plot chord diagrams to show relationship between groups. Place this function in your workspace to use.

function p = chordPlot(groups, connectionTable)
%%% Plot chord diagram
%%% Inputs:
%%% groups - One dimensional vector or cell array containing group names to be plotted around the chord diagram
%%% connectionTable - An n-by-2, or n-by-3, or n-by-4 table where columns one and two contain the groups to be connected and the
%%% third column are the weights for each connection, which are converted to line weights. The 4th
%%% column is the sign of the relationship, used for creating a gradient line between
%%% node.
%%% If you want all lines to be of equal weight, turn
%%% third column into a column of ones. If you want all lines to be solid color, 4th column
%%% into a column of zeros. Use array2table
%%% or cell2table to convert arrays or cells to
%%% tables
%%%
%%% Plot properties can be changed after plotting by for example doing:
%%% p.MarkerSize = 5;
%%% p.NodeFontSize = 12;
%%%
%%%
%%% Example plot:
% % % groups = 1:10;
% % % connections(:,1) = randi(10,50,1);
% % % connections(:,2) = randi(10,50,1);
% % % connections(:,3) = 2*rand(50,1);
% % % connections(:,4) = sign((rand(50,1) > 0.5) - 0.5);
% % % connectionsT = array2table(connections);
% % % chordPlot(groups,connectionsT)