# 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 =3;
end
% There are a total of 2 entries in each of the rate and state variable arrays.
% There are a total of 15 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 (hour)');
LEGEND_CONSTANTS(:,1) = strpad('T_a in component model_parameters (celsius)');
LEGEND_CONSTANTS(:,2) = strpad('T_b in component model_parameters (celsius)');
LEGEND_CONSTANTS(:,3) = strpad('delta_T in component model_parameters (celsius)');
LEGEND_CONSTANTS(:,4) = strpad('kinc in component model_parameters (W_per_kg_C2)');
LEGEND_ALGEBRAIC(:,3) = strpad('M_c in component M_c (W_per_kg)');
LEGEND_CONSTANTS(:,5) = strpad('t_day in component M_c (hour)');
LEGEND_CONSTANTS(:,6) = strpad('t_night in component M_c (hour)');
LEGEND_ALGEBRAIC(:,1) = strpad('tprime in component M_c (second)');
LEGEND_CONSTANTS(:,7) = strpad('day_length in component M_c (second)');
LEGEND_CONSTANTS(:,14) = strpad('M_day in component M_day (W_per_kg)');
LEGEND_CONSTANTS(:,15) = strpad('M_night in component M_night (W_per_kg)');
LEGEND_STATES(:,1) = strpad('M in component M (W_per_kg)');
LEGEND_CONSTANTS(:,8) = strpad('km in component M (per_hour)');
LEGEND_STATES(:,2) = strpad('T in component T (celsius)');
LEGEND_CONSTANTS(:,9) = strpad('c in component T (kJ_per_kg_C)');
LEGEND_ALGEBRAIC(:,2) = strpad('k in component k (W_per_kg_C)');
LEGEND_CONSTANTS(:,13) = strpad('kb in component kb (W_per_kg_C)');
LEGEND_CONSTANTS(:,11) = strpad('T_day in component T_day (celsius)');
LEGEND_CONSTANTS(:,12) = strpad('T_night in component T_night (celsius)');
LEGEND_CONSTANTS(:,10) = strpad('M_b in component kb (W_per_kg)');
LEGEND_RATES(:,1) = strpad('d/dt M in component M (W_per_kg)');
LEGEND_RATES(:,2) = strpad('d/dt T in component T (celsius)');
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) = 21.0;
CONSTANTS(:,2) = 38.0;
CONSTANTS(:,3) = 1.57;
CONSTANTS(:,4) = 0.0258;
CONSTANTS(:,5) = 17.5;
CONSTANTS(:,6) = 6.73;
CONSTANTS(:,7) = 86400;
STATES(:,1) = 3.5;
CONSTANTS(:,8) = 1.1375;
STATES(:,2) = 38.785;
CONSTANTS(:,9) = 3.47;
CONSTANTS(:,10) = 3.0;
CONSTANTS(:,11) = CONSTANTS(:,2)+CONSTANTS(:,3)./2.00000;
CONSTANTS(:,12) = CONSTANTS(:,2) - CONSTANTS(:,3)./2.00000;
CONSTANTS(:,13) = CONSTANTS(:,10)./(CONSTANTS(:,2) - CONSTANTS(:,1));
CONSTANTS(:,14) =  (CONSTANTS(:,13)+ CONSTANTS(:,4).*(CONSTANTS(:,11) - CONSTANTS(:,2))).*(CONSTANTS(:,11) - CONSTANTS(:,1));
CONSTANTS(:,15) =  (CONSTANTS(:,13)+ CONSTANTS(:,4).*(CONSTANTS(:,12) - CONSTANTS(:,2))).*(CONSTANTS(:,12) - CONSTANTS(:,1));
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) = CONSTANTS(:,13)+ CONSTANTS(:,4).*(STATES(:,2) - CONSTANTS(:,2));
RATES(:,2) =  power(CONSTANTS(:,9), -1.00000).*(STATES(:,1) -  ALGEBRAIC(:,2).*(STATES(:,2) - CONSTANTS(:,1)));
ALGEBRAIC(:,1) =  rem( VOI.*3600.00.*1.00000, CONSTANTS(:,7));
ALGEBRAIC(:,3) = piecewise({ALGEBRAIC(:,1)./3600.00>=CONSTANTS(:,6)&ALGEBRAIC(:,1)./3600.00<CONSTANTS(:,5), CONSTANTS(:,15) }, CONSTANTS(:,14));
RATES(:,1) =   - CONSTANTS(:,8).*(STATES(:,1) - ALGEBRAIC(:,3));
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) = CONSTANTS(:,13)+ CONSTANTS(:,4).*(STATES(:,2) - CONSTANTS(:,2));
ALGEBRAIC(:,1) =  rem( VOI.*3600.00.*1.00000, CONSTANTS(:,7));
ALGEBRAIC(:,3) = piecewise({ALGEBRAIC(:,1)./3600.00>=CONSTANTS(:,6)&ALGEBRAIC(:,1)./3600.00<CONSTANTS(:,5), CONSTANTS(:,15) }, CONSTANTS(:,14));
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
Derived from workspace Overgaard 2007 at changeset b2bd8266c310.
Collaboration
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