# 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 =6;
end
% There are a total of 1 entries in each of the rate and state variable arrays.
% There are a total of 22 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 (second)');
LEGEND_STATES(:,1) = strpad('C_ext_Na in component Concentrations (mM)');
LEGEND_CONSTANTS(:,1) = strpad('C_ext_H in component Concentrations (mM)');
LEGEND_CONSTANTS(:,2) = strpad('C_ext_NH4 in component Concentrations (mM)');
LEGEND_CONSTANTS(:,3) = strpad('C_int_Na in component Concentrations (mM)');
LEGEND_CONSTANTS(:,4) = strpad('C_int_H in component Concentrations (mM)');
LEGEND_CONSTANTS(:,5) = strpad('C_int_NH4 in component Concentrations (mM)');
LEGEND_CONSTANTS(:,6) = strpad('XTxP0_NHE3_Na in component NHE3_Parameters (nmol_per_s_per_cm2)');
LEGEND_CONSTANTS(:,7) = strpad('XTxP0_NHE3_H in component NHE3_Parameters (nmol_per_s_per_cm2)');
LEGEND_CONSTANTS(:,8) = strpad('XTxP0_NHE3_NH4 in component NHE3_Parameters (nmol_per_s_per_cm2)');
LEGEND_CONSTANTS(:,9) = strpad('K_NHE3_Na in component NHE3_Parameters (mM)');
LEGEND_CONSTANTS(:,10) = strpad('K_NHE3_H in component NHE3_Parameters (mM)');
LEGEND_CONSTANTS(:,11) = strpad('K_NHE3_NH4 in component NHE3_Parameters (mM)');
LEGEND_CONSTANTS(:,17) = strpad('XTxP_NHE3_Na in component NHE3 (nmol_per_s_per_cm2)');
LEGEND_CONSTANTS(:,18) = strpad('XTxP_NHE3_H in component NHE3 (nmol_per_s_per_cm2)');
LEGEND_CONSTANTS(:,19) = strpad('XTxP_NHE3_NH4 in component NHE3 (nmol_per_s_per_cm2)');
LEGEND_ALGEBRAIC(:,1) = strpad('alpha_ext_Na in component NHE3 (dimensionless)');
LEGEND_CONSTANTS(:,12) = strpad('beta_ext_H in component NHE3 (dimensionless)');
LEGEND_CONSTANTS(:,13) = strpad('gamma_ext_NH4 in component NHE3 (dimensionless)');
LEGEND_CONSTANTS(:,14) = strpad('alpha_int_Na in component NHE3 (dimensionless)');
LEGEND_CONSTANTS(:,15) = strpad('beta_int_H in component NHE3 (dimensionless)');
LEGEND_CONSTANTS(:,16) = strpad('gamma_int_NH4 in component NHE3 (dimensionless)');
LEGEND_ALGEBRAIC(:,2) = strpad('sum_NHE3 in component NHE3 (nmol_per_s_per_cm2)');
LEGEND_ALGEBRAIC(:,3) = strpad('J_NHE3_Na in component NHE3 (nmol_per_s_per_cm2)');
LEGEND_ALGEBRAIC(:,4) = strpad('J_NHE3_H in component NHE3 (nmol_per_s_per_cm2)');
LEGEND_ALGEBRAIC(:,5) = strpad('J_NHE3_NH4 in component NHE3 (nmol_per_s_per_cm2)');
LEGEND_CONSTANTS(:,20) = strpad('J_NHE3_Na_Max in component NHE3 (nmol_per_s_per_cm2)');
LEGEND_CONSTANTS(:,21) = strpad('K_Na in component NHE3 (dimensionless)');
LEGEND_ALGEBRAIC(:,6) = strpad('plot in component NHE3 (mM)');
LEGEND_RATES(:,1) = strpad('d/dt C_ext_Na in component Concentrations (mM)');
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) = 1;
CONSTANTS(:,1) = 3.1623e-5;
CONSTANTS(:,2) = 0;
CONSTANTS(:,3) = 0;
CONSTANTS(:,4) = 1e-3;
CONSTANTS(:,5) = 0;
CONSTANTS(:,6) = 1.6e-3;
CONSTANTS(:,7) = 0.48e-3;
CONSTANTS(:,8) = 1.6e-3;
CONSTANTS(:,9) = 30;
CONSTANTS(:,10) = 72e-6;
CONSTANTS(:,11) = 0.027e3;
CONSTANTS(:,12) = CONSTANTS(:,1)./CONSTANTS(:,10);
CONSTANTS(:,21) = 100.000;
CONSTANTS(:,13) = CONSTANTS(:,2)./CONSTANTS(:,11);
CONSTANTS(:,14) = CONSTANTS(:,3)./CONSTANTS(:,9);
CONSTANTS(:,15) = CONSTANTS(:,4)./CONSTANTS(:,10);
CONSTANTS(:,16) = CONSTANTS(:,5)./CONSTANTS(:,11);
CONSTANTS(:,17) = ( CONSTANTS(:,6).*2.00000.*CONSTANTS(:,4))./(CONSTANTS(:,4)+1.00000e-06);
CONSTANTS(:,18) = ( CONSTANTS(:,7).*2.00000.*CONSTANTS(:,4))./(CONSTANTS(:,4)+1.00000e-06);
CONSTANTS(:,19) = ( CONSTANTS(:,8).*2.00000.*CONSTANTS(:,4))./(CONSTANTS(:,4)+1.00000e-06);
CONSTANTS(:,20) = ( CONSTANTS(:,17).*CONSTANTS(:,18))./(CONSTANTS(:,17)+CONSTANTS(:,18));
CONSTANTS(:,21) = (CONSTANTS(:,15)+ 2.00000.*CONSTANTS(:,15).*CONSTANTS(:,12)+CONSTANTS(:,12))./(CONSTANTS(:,15)+( (1.00000+CONSTANTS(:,15)).*CONSTANTS(:,17))./CONSTANTS(:,18));
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);
else
statesRowCount = statesSize(1);
ALGEBRAIC = zeros(statesRowCount, algebraicVariableCount);
RATES = zeros(statesRowCount, statesColumnCount);
end
RATES(:,1) = CONSTANTS(:,21);
RATES = RATES';
end

% Calculate algebraic variables
function ALGEBRAIC = computeAlgebraic(ALGEBRAIC, CONSTANTS, STATES, VOI)
ALGEBRAIC(:,1) = STATES(:,1)./CONSTANTS(:,9);
ALGEBRAIC(:,2) =  (1.00000+ALGEBRAIC(:,1)+CONSTANTS(:,12)+CONSTANTS(:,13)).*( CONSTANTS(:,17).*CONSTANTS(:,14)+ CONSTANTS(:,18).*CONSTANTS(:,15)+ CONSTANTS(:,19).*CONSTANTS(:,16))+ (1.00000+CONSTANTS(:,14)+CONSTANTS(:,15)+CONSTANTS(:,16)).*( CONSTANTS(:,17).*ALGEBRAIC(:,1)+ CONSTANTS(:,18).*CONSTANTS(:,12)+ CONSTANTS(:,19).*CONSTANTS(:,13));
ALGEBRAIC(:,3) =  (( CONSTANTS(:,17).*CONSTANTS(:,18))./ALGEBRAIC(:,2)).*( ALGEBRAIC(:,1).*CONSTANTS(:,15) -  CONSTANTS(:,14).*CONSTANTS(:,12))+ (( CONSTANTS(:,17).*CONSTANTS(:,19))./ALGEBRAIC(:,2)).*( ALGEBRAIC(:,1).*CONSTANTS(:,16) -  CONSTANTS(:,14).*CONSTANTS(:,13));
ALGEBRAIC(:,4) =  (( CONSTANTS(:,17).*CONSTANTS(:,18))./ALGEBRAIC(:,2)).*( CONSTANTS(:,14).*CONSTANTS(:,12) -  ALGEBRAIC(:,1).*CONSTANTS(:,15))+ (( CONSTANTS(:,18).*CONSTANTS(:,19))./ALGEBRAIC(:,2)).*( CONSTANTS(:,12).*CONSTANTS(:,16) -  CONSTANTS(:,15).*CONSTANTS(:,13));
ALGEBRAIC(:,5) =  (( CONSTANTS(:,17).*CONSTANTS(:,19))./ALGEBRAIC(:,2)).*( CONSTANTS(:,14).*CONSTANTS(:,13) -  ALGEBRAIC(:,1).*CONSTANTS(:,16))+ (( CONSTANTS(:,18).*CONSTANTS(:,19))./ALGEBRAIC(:,2)).*( CONSTANTS(:,13).*CONSTANTS(:,15) -  CONSTANTS(:,12).*CONSTANTS(:,16));
ALGEBRAIC(:,6) = STATES(:,1)./(ALGEBRAIC(:,3)./CONSTANTS(:,20));
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 Weinstein, 1995 at changeset 001604d8854b.
Collaboration
To begin collaborating on this work, please use your git client and issue this command: