Generated Code
The following is matlab code generated by the CellML API from this CellML file. (Back to language selection)
The raw code is available.
function [VOI, STATES, ALGEBRAIC, CONSTANTS] = mainFunction()
% This is the "main function". In Matlab, things work best if you rename this function to match the filename.
[VOI, STATES, ALGEBRAIC, CONSTANTS] = solveModel();
end
function [algebraicVariableCount] = getAlgebraicVariableCount()
% Used later when setting a global variable with the number of algebraic variables.
% Note: This is not the "main method".
algebraicVariableCount =10;
end
% There are a total of 4 entries in each of the rate and state variable arrays.
% There are a total of 8 entries in the constant variable array.
%
function [VOI, STATES, ALGEBRAIC, CONSTANTS] = solveModel()
% Create ALGEBRAIC of correct size
global algebraicVariableCount; algebraicVariableCount = getAlgebraicVariableCount();
% Initialise constants and state variables
[INIT_STATES, CONSTANTS] = initConsts;
% Set timespan to solve over
tspan = [0, 10];
% Set numerical accuracy options for ODE solver
options = odeset('RelTol', 1e-06, 'AbsTol', 1e-06, 'MaxStep', 1);
% Solve model with ODE solver
[VOI, STATES] = ode15s(@(VOI, STATES)computeRates(VOI, STATES, CONSTANTS), tspan, INIT_STATES, options);
% Compute algebraic variables
[RATES, ALGEBRAIC] = computeRates(VOI, STATES, CONSTANTS);
ALGEBRAIC = computeAlgebraic(ALGEBRAIC, CONSTANTS, STATES, VOI);
% Plot state variables against variable of integration
[LEGEND_STATES, LEGEND_ALGEBRAIC, LEGEND_VOI, LEGEND_CONSTANTS] = createLegends();
figure();
plot(VOI, STATES);
xlabel(LEGEND_VOI);
l = legend(LEGEND_STATES);
set(l,'Interpreter','none');
end
function [LEGEND_STATES, LEGEND_ALGEBRAIC, LEGEND_VOI, LEGEND_CONSTANTS] = createLegends()
LEGEND_STATES = ''; LEGEND_ALGEBRAIC = ''; LEGEND_VOI = ''; LEGEND_CONSTANTS = '';
LEGEND_VOI = strpad('time in component environment (millisecond)');
LEGEND_STATES(:,1) = strpad('V in component membrane (millivolt)');
LEGEND_CONSTANTS(:,1) = strpad('E_R in component membrane (millivolt)');
LEGEND_CONSTANTS(:,2) = strpad('Cm in component membrane (microF_per_cm2)');
LEGEND_ALGEBRAIC(:,5) = strpad('i_Na in component sodium_channel (microA_per_cm2)');
LEGEND_ALGEBRAIC(:,9) = strpad('i_K in component potassium_channel (microA_per_cm2)');
LEGEND_ALGEBRAIC(:,10) = strpad('i_L in component leakage_current (microA_per_cm2)');
LEGEND_ALGEBRAIC(:,1) = strpad('i_Stim in component membrane (microA_per_cm2)');
LEGEND_CONSTANTS(:,3) = strpad('g_Na in component sodium_channel (milliS_per_cm2)');
LEGEND_CONSTANTS(:,6) = strpad('E_Na in component sodium_channel (millivolt)');
LEGEND_STATES(:,2) = strpad('m in component sodium_channel_m_gate (dimensionless)');
LEGEND_STATES(:,3) = strpad('h in component sodium_channel_h_gate (dimensionless)');
LEGEND_ALGEBRAIC(:,2) = strpad('alpha_m in component sodium_channel_m_gate (per_millisecond)');
LEGEND_ALGEBRAIC(:,6) = strpad('beta_m in component sodium_channel_m_gate (per_millisecond)');
LEGEND_ALGEBRAIC(:,3) = strpad('alpha_h in component sodium_channel_h_gate (per_millisecond)');
LEGEND_ALGEBRAIC(:,7) = strpad('beta_h in component sodium_channel_h_gate (per_millisecond)');
LEGEND_CONSTANTS(:,4) = strpad('g_K in component potassium_channel (milliS_per_cm2)');
LEGEND_CONSTANTS(:,7) = strpad('E_K in component potassium_channel (millivolt)');
LEGEND_STATES(:,4) = strpad('n in component potassium_channel_n_gate (dimensionless)');
LEGEND_ALGEBRAIC(:,4) = strpad('alpha_n in component potassium_channel_n_gate (per_millisecond)');
LEGEND_ALGEBRAIC(:,8) = strpad('beta_n in component potassium_channel_n_gate (per_millisecond)');
LEGEND_CONSTANTS(:,5) = strpad('g_L in component leakage_current (milliS_per_cm2)');
LEGEND_CONSTANTS(:,8) = strpad('E_L in component leakage_current (millivolt)');
LEGEND_RATES(:,1) = strpad('d/dt V in component membrane (millivolt)');
LEGEND_RATES(:,2) = strpad('d/dt m in component sodium_channel_m_gate (dimensionless)');
LEGEND_RATES(:,3) = strpad('d/dt h in component sodium_channel_h_gate (dimensionless)');
LEGEND_RATES(:,4) = strpad('d/dt n in component potassium_channel_n_gate (dimensionless)');
LEGEND_STATES = LEGEND_STATES';
LEGEND_ALGEBRAIC = LEGEND_ALGEBRAIC';
LEGEND_RATES = LEGEND_RATES';
LEGEND_CONSTANTS = LEGEND_CONSTANTS';
end
function [STATES, CONSTANTS] = initConsts()
VOI = 0; CONSTANTS = []; STATES = []; ALGEBRAIC = [];
STATES(:,1) = -75;
CONSTANTS(:,1) = -75;
CONSTANTS(:,2) = 1;
CONSTANTS(:,3) = 120;
STATES(:,2) = 0.05;
STATES(:,3) = 0.6;
CONSTANTS(:,4) = 36;
STATES(:,4) = 0.325;
CONSTANTS(:,5) = 0.3;
CONSTANTS(:,6) = CONSTANTS(:,1)+115.000;
CONSTANTS(:,7) = CONSTANTS(:,1) - 12.0000;
CONSTANTS(:,8) = CONSTANTS(:,1)+10.6130;
if (isempty(STATES)), warning('Initial values for states not set');, end
end
function [RATES, ALGEBRAIC] = computeRates(VOI, STATES, CONSTANTS)
global algebraicVariableCount;
statesSize = size(STATES);
statesColumnCount = statesSize(2);
if ( statesColumnCount == 1)
STATES = STATES';
ALGEBRAIC = zeros(1, algebraicVariableCount);
utilOnes = 1;
else
statesRowCount = statesSize(1);
ALGEBRAIC = zeros(statesRowCount, algebraicVariableCount);
RATES = zeros(statesRowCount, statesColumnCount);
utilOnes = ones(statesRowCount, 1);
end
ALGEBRAIC(:,2) = ( - 0.100000.*(STATES(:,1)+50.0000))./(exp( - (STATES(:,1)+50.0000)./10.0000) - 1.00000);
ALGEBRAIC(:,6) = 4.00000.*exp( - (STATES(:,1)+75.0000)./18.0000);
RATES(:,2) = ALGEBRAIC(:,2).*(1.00000 - STATES(:,2)) - ALGEBRAIC(:,6).*STATES(:,2);
ALGEBRAIC(:,3) = 0.0700000.*exp( - (STATES(:,1)+75.0000)./20.0000);
ALGEBRAIC(:,7) = 1.00000./(exp( - (STATES(:,1)+45.0000)./10.0000)+1.00000);
RATES(:,3) = ALGEBRAIC(:,3).*(1.00000 - STATES(:,3)) - ALGEBRAIC(:,7).*STATES(:,3);
ALGEBRAIC(:,4) = ( - 0.0100000.*(STATES(:,1)+65.0000))./(exp( - (STATES(:,1)+65.0000)./10.0000) - 1.00000);
ALGEBRAIC(:,8) = 0.125000.*exp((STATES(:,1)+75.0000)./80.0000);
RATES(:,4) = ALGEBRAIC(:,4).*(1.00000 - STATES(:,4)) - ALGEBRAIC(:,8).*STATES(:,4);
ALGEBRAIC(:,5) = CONSTANTS(:,3).*power(STATES(:,2), 3.00000).*STATES(:,3).*(STATES(:,1) - CONSTANTS(:,6));
ALGEBRAIC(:,9) = CONSTANTS(:,4).*power(STATES(:,4), 4.00000).*(STATES(:,1) - CONSTANTS(:,7));
ALGEBRAIC(:,10) = CONSTANTS(:,5).*(STATES(:,1) - CONSTANTS(:,8));
ALGEBRAIC(:,1) = piecewise({VOI>=10.0000&VOI<=10.5000, 20.0000 }, 0.00000);
RATES(:,1) = - ( - ALGEBRAIC(:,1)+ALGEBRAIC(:,5)+ALGEBRAIC(:,9)+ALGEBRAIC(:,10))./CONSTANTS(:,2);
RATES = RATES';
end
% Calculate algebraic variables
function ALGEBRAIC = computeAlgebraic(ALGEBRAIC, CONSTANTS, STATES, VOI)
statesSize = size(STATES);
statesColumnCount = statesSize(2);
if ( statesColumnCount == 1)
STATES = STATES';
utilOnes = 1;
else
statesRowCount = statesSize(1);
utilOnes = ones(statesRowCount, 1);
end
ALGEBRAIC(:,2) = ( - 0.100000.*(STATES(:,1)+50.0000))./(exp( - (STATES(:,1)+50.0000)./10.0000) - 1.00000);
ALGEBRAIC(:,6) = 4.00000.*exp( - (STATES(:,1)+75.0000)./18.0000);
ALGEBRAIC(:,3) = 0.0700000.*exp( - (STATES(:,1)+75.0000)./20.0000);
ALGEBRAIC(:,7) = 1.00000./(exp( - (STATES(:,1)+45.0000)./10.0000)+1.00000);
ALGEBRAIC(:,4) = ( - 0.0100000.*(STATES(:,1)+65.0000))./(exp( - (STATES(:,1)+65.0000)./10.0000) - 1.00000);
ALGEBRAIC(:,8) = 0.125000.*exp((STATES(:,1)+75.0000)./80.0000);
ALGEBRAIC(:,5) = CONSTANTS(:,3).*power(STATES(:,2), 3.00000).*STATES(:,3).*(STATES(:,1) - CONSTANTS(:,6));
ALGEBRAIC(:,9) = CONSTANTS(:,4).*power(STATES(:,4), 4.00000).*(STATES(:,1) - CONSTANTS(:,7));
ALGEBRAIC(:,10) = CONSTANTS(:,5).*(STATES(:,1) - CONSTANTS(:,8));
ALGEBRAIC(:,1) = piecewise({VOI>=10.0000&VOI<=10.5000, 20.0000 }, 0.00000);
end
% Compute result of a piecewise function
function x = piecewise(cases, default)
set = [0];
for i = 1:2:length(cases)
if (length(cases{i+1}) == 1)
x(cases{i} & ~set,:) = cases{i+1};
else
x(cases{i} & ~set,:) = cases{i+1}(cases{i} & ~set);
end
set = set | cases{i};
if(set), break, end
end
if (length(default) == 1)
x(~set,:) = default;
else
x(~set,:) = default(~set);
end
end
% Pad out or shorten strings to a set length
function strout = strpad(strin)
req_length = 160;
insize = size(strin,2);
if insize > req_length
strout = strin(1:req_length);
else
strout = [strin, blanks(req_length - insize)];
end
end