Error using odeset (line 231) Unrecognized property name 'mass_matr​ix_without​_tld'. Error in my_ode_sol​ver_withou​t_tld (line 8) opts = odeset('ma​ss_matrix_​without_tl​d',@(t,y)

function Y = mass_matrix_without_tld(t,y)

% Mass matrix function
Y = zeros(2,2);
Y(1,1) = 1;
Y(2,2) = 1;
end  
clc;
clear all;
%% To run mass spring damper system
tspan = 0:0.1:20; 
y = [0 0];
opts = odeset('mass_matrix_without_tld',@(t,y) mass_matrix_without_tld(t,y));


%% Solve using ode45
[tsol,ysol] = ode45(@(t,y)my_ode_without_tld(t,y), tspan, y, opts);

%% plotting
plot(tsol,ysol(:,1))
xlabel('time(sec)')
ylabel('displacement(m)')
grid on
title('Displacement response of structure')
figure
plot(tsol,ysol(:,2))
xlabel('time(sec)')
ylabel('velocity(m/s)')
grid on
title('Velocity response of structure')

[RAJKUMAR SAHA]

Why error is showing that unrecognized property name??

Answer 1

[Torsten]

Because the property

'mass_matrix_without_tld'

does not exist for the ODE solvers.

Maybe you mean the existing property

'Mass'

?