# 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 =2;
end
% There are a total of 1 entries in each of the rate and state variable arrays.
% There are a total of 7 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 (s)');
LEGEND_CONSTANTS(:,1) = strpad('HR in component Environment (ratepm)');
LEGEND_CONSTANTS(:,6) = strpad('hrf in component Environment (Hz)');
LEGEND_CONSTANTS(:,2) = strpad('PRint in component LVTiming (s)');
LEGEND_ALGEBRAIC(:,1) = strpad('beattime in component LVTiming (s)');
LEGEND_CONSTANTS(:,3) = strpad('Esys in component LVElastanceFunction (elastance)');
LEGEND_CONSTANTS(:,4) = strpad('Edia in component LVElastanceFunction (elastance)');
LEGEND_CONSTANTS(:,5) = strpad('TsK in component LVElastanceFunction (s)');
LEGEND_CONSTANTS(:,7) = strpad('Ts in component LVElastanceFunction (s)');
LEGEND_ALGEBRAIC(:,2) = strpad('E_LV in component LVElastanceFunction (elastance)');
LEGEND_STATES(:,1) = strpad('dummy in component dummy (dimensionless)');
LEGEND_RATES(:,1) = strpad('d/dt dummy in component dummy (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 = [];
CONSTANTS(:,1) = 70;
CONSTANTS(:,2) = 0.00012;
CONSTANTS(:,3) = 5.6;
CONSTANTS(:,4) = 0.19;
CONSTANTS(:,5) = 0.35;
STATES(:,1) = 10;
CONSTANTS(:,6) = CONSTANTS(:,1)./60.0000;
CONSTANTS(:,7) =  CONSTANTS(:,5).*power(( 1.00000.*CONSTANTS(:,6)), 1.0 ./ 2);
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
RATES(:,1) =  STATES(:,1).* - 3.00000;
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(:,1) = (VOI -  floor(VOI./CONSTANTS(:,6)).*CONSTANTS(:,6)) - CONSTANTS(:,2);
ALGEBRAIC(:,2) = piecewise({ALGEBRAIC(:,1)>=0.00000&ALGEBRAIC(:,1)<=CONSTANTS(:,7), CONSTANTS(:,4)+( (CONSTANTS(:,3) - CONSTANTS(:,4)).*(1.00000 - cos((  pi.*ALGEBRAIC(:,1))./CONSTANTS(:,7))))./2.00000 , ALGEBRAIC(:,1)< 1.50000.*CONSTANTS(:,7)&ALGEBRAIC(:,1)>=CONSTANTS(:,7), CONSTANTS(:,4)+( (CONSTANTS(:,3) - CONSTANTS(:,4)).*(1.00000+cos(( 2.00000.* pi.*(ALGEBRAIC(:,1) - CONSTANTS(:,7)))./CONSTANTS(:,7))))./2.00000 }, CONSTANTS(:,4));
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
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

```
Source