changed variable names to unicode

Author: AndreyAPopov

toolbox/+otp/+lorenz63/+presets/Canonical.m

@@ -1,7 +1,7 @@
 classdef Canonical < otp.lorenz63.Lorenz63Problem
     % Original Lorenz '63 preset presented in :cite:p:`Lor63`
-    % which uses time span $t \in [0, 60]$, $\sigma = 10$, $\rho = 28$, 
-    % $\beta = 8/3$, and intial conditions $y_0 = [0, 1, 0]^T$.
+    % which uses time span $t \in [0, 60]$, $σ = 10$, $ρ = 28$, 
+    % $β = 8/3$, and intial conditions $y_0 = [0, 1, 0]^T$.
 
     methods
         function obj = Canonical(varargin)
@@ -12,9 +12,9 @@
             % varargin
             %    A variable number of name-value pairs. The accepted names are
             %
-            %    - ``sigma`` – Value of $\sigma$.
-            %    - ``rho`` – Value of $\rho$.
-            %    - ``beta`` – Value of $\beta$.
+            %    - ``sigma`` – Value of $σ$.
+            %    - ``rho`` – Value of $ρ$.
+            %    - ``beta`` – Value of $β$.
             %
 
             p = inputParser;

toolbox/+otp/+lorenz63/+presets/LimitCycle.m

@@ -1,13 +1,13 @@
 classdef LimitCycle < otp.lorenz63.Lorenz63Problem
     % Lorenz '63 preset limit cycle, a non-chaotic preset, from :cite:p:`Str18` 
-    % which uses time span $t \in [0, 60]$, $\sigma = 10$, $\rho = 350$, 
-    % $\beta = 8/3$, and intial conditions $y_0 = [0, 1, 0]^T$.
+    % which uses time span $t \in [0, 60]$, $σ = 10$, $ρ = 350$, 
+    % $β = 8/3$, and intial conditions $y_0 = [0, 1, 0]^T$.
 
     methods
         function obj = LimitCycle
             % Create the LimitCycle Lorenz '63 problem object.
             %
-            
+
             sigma = 10;
             rho   = 350;
             beta  = 8/3;

toolbox/+otp/+lorenz63/+presets/Surprise.m

@@ -1,6 +1,6 @@
 classdef Surprise < otp.lorenz63.Lorenz63Problem
     % Lorenz '63 preset 'surprise' from :cite:p:`Str18` which uses time span $t \in [0, 60]$, 
-    % $\sigma = 10$, $\rho = 100$, $\beta = 8/3$, and intial conditions $y_0 = [2, 1, 1]^T$.
+    % $σ = 10$, $ρ = 100$, $β = 8/3$, and intial conditions $y_0 = [2, 1, 1]^T$.
 
     methods
         function obj = Surprise

toolbox/+otp/+lorenz63/Lorenz63Problem.m

@@ -4,9 +4,9 @@
     % The three variable Lorenz '63 problem :cite:p:`Lor63` of the form,
     %
     % $$
-    % x' &= \sigma(y - x),\\
-    % y' &= \rho x - y - xz,\\
-    % z' &= xy - \beta z,
+    % x' &= σ(y - x),\\
+    % y' &= ρx - y - xz,\\
+    % z' &= xy - βz,
     % $$
     %
     % exhibits chaotic behavior for certain values of the parameters.
@@ -23,7 +23,7 @@
     % +---------------------+-----------------------------------------------------------+
     % | Number of Variables | 3                                                         |
     % +---------------------+-----------------------------------------------------------+
-    % | Stiff               | not typically, depending on $\sigma$, $\rho$, and $\beta$ |
+    % | Stiff               | not typically, depending on $σ$, $ρ$, and $β$             |
     % +---------------------+-----------------------------------------------------------+
     %
     % Example