Unrecognized function or variable 'vec2mat'. Error in maynard_rd (line 32) x_n = vec2mat(z, n);

function dz = rd(t, z)
% RD Computes the differential equation that describes the update of the 
%    populations' state following the replicator dynamics
% 
% SYNOPSIS: DZ = RD(T, Z)
% 
% INPUT T: Time. Although the dynamics are time invariant, this parameter 
%          might be used to calculate the fitness function
%       Z: Vector of the populations' state
% 
% OUTPUT DZ: Vector with the value of the differential equation given T and Z
% 
% REMARKS Its better to execute first <a href="matlab: help definition">definition</a> and run the game using
%         G.run(). This function uses the global variables 'G' and 'norm_dx'
%         to define the game
%
% SEE ALSO definition, bnn, logit, maynard_rd, smith, smith_b, stopevent, combined_dynamics
%
% For more information see: <a href="https://github.com/carlobar/PDToolbox_matlab/">the GitHub's repository.</a>
% 
% Carlos Barreto, 04-11-16 

global G norm_dx

n = max(G.S); 

F = zeros(G.P, n);
F_mean = zeros(G.P, 1);
x_dot_v = zeros(G.P* n, 1);

% extract matrix of strategies
x_n = vec2mat(z, n);
x = zeros(G.P, n);

for p = 1 : G.P
    x(p, :) = x_n(p, :) * G.m(p);
end

if G.pop_wise == 0
	F(:, :) = G.f(x);
else
	for p = 1 : G.P
   		F(p, :) = G.f(x, p);
	end
end

for p = 1 : G.P
    F_mean(p) = F(p, :) * x_n(p, :)';

    % calculate update in the strategy
    F_excess = F(p, :) - ones(1, n) * F_mean(p);
    x_dot_v ( (p-1)*n + 1 : p*n ) = F_excess .* x_n(p, :);
end

dz = [x_dot_v];
if G.stop_c == true
    norm_dx = norm(dz);
end

Answer 1

[Jayanti]

Hi,

The error you're encountering is because MATLAB cannot find the definition of “vec2mat”. From the documentation, “vec2mat” is not recommended starting from MATLAB R2020a. Instead, you can use “reshape”.

Please refer to following documentation link on “reshape”:

https://in.mathworks.com/help/matlab/ref/double.reshape.html

Hope this will resolve the issue!

Answer 2

[Torsten]

"vec2mat" is part of the Communications Toolbox. Do you have this toolbox licenced and installed ?