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 =20;
end
% There are a total of 17 entries in each of the rate and state variable arrays.
% There are a total of 33 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_ALGEBRAIC(:,1) = strpad('v1 in component v1 (flux)');
    LEGEND_STATES(:,1) = strpad('pM9 in component pM9 (molar)');
    LEGEND_STATES(:,2) = strpad('M3 in component M3 (molar)');
    LEGEND_STATES(:,3) = strpad('M3_pM9 in component M3_pM9 (molar)');
    LEGEND_CONSTANTS(:,1) = strpad('kon_M3pM9 in component kinetic_parameters (second_order_rate_constant)');
    LEGEND_CONSTANTS(:,2) = strpad('koff_M3pM9 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,2) = strpad('v2 in component v2 (flux)');
    LEGEND_CONSTANTS(:,3) = strpad('kact_M3pM9 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,3) = strpad('v3 in component v3 (flux)');
    LEGEND_STATES(:,4) = strpad('M3_T1 in component M3_T1 (molar)');
    LEGEND_STATES(:,5) = strpad('T1 in component T1 (molar)');
    LEGEND_CONSTANTS(:,4) = strpad('kon_M3T1 in component kinetic_parameters (second_order_rate_constant)');
    LEGEND_CONSTANTS(:,5) = strpad('koff_M3T1 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,4) = strpad('v4 in component v4 (flux)');
    LEGEND_STATES(:,6) = strpad('pM9_T1 in component pM9_T1 (molar)');
    LEGEND_CONSTANTS(:,6) = strpad('kon_pM9T1 in component kinetic_parameters (second_order_rate_constant)');
    LEGEND_CONSTANTS(:,7) = strpad('koff_pM9T1 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,5) = strpad('v5 in component v5 (flux)');
    LEGEND_STATES(:,7) = strpad('M3_pM9_T1 in component M3_pM9_T1 (molar)');
    LEGEND_CONSTANTS(:,8) = strpad('kon_M3pM9T1 in component kinetic_parameters (second_order_rate_constant)');
    LEGEND_CONSTANTS(:,9) = strpad('koff_M3pM9T1 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,6) = strpad('v6 in component v6 (flux)');
    LEGEND_CONSTANTS(:,10) = strpad('kact_M3pM9T1 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,7) = strpad('v7 in component v7 (flux)');
    LEGEND_STATES(:,8) = strpad('M9_T1_star in component M9_T1_star (molar)');
    LEGEND_STATES(:,9) = strpad('M9 in component M9 (molar)');
    LEGEND_CONSTANTS(:,11) = strpad('kon_M9T1_star in component kinetic_parameters (second_order_rate_constant)');
    LEGEND_CONSTANTS(:,12) = strpad('koff_M9T1_star in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,8) = strpad('v8 in component v8 (flux)');
    LEGEND_STATES(:,10) = strpad('M9_T1 in component M9_T1 (molar)');
    LEGEND_CONSTANTS(:,13) = strpad('kon_M9T1 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_CONSTANTS(:,14) = strpad('koff_M9T1 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,9) = strpad('v9 in component v9 (flux)');
    LEGEND_STATES(:,11) = strpad('M9_T1_M3 in component M9_T1_M3 (molar)');
    LEGEND_CONSTANTS(:,15) = strpad('kon_M9_M3T1 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_CONSTANTS(:,16) = strpad('koff_M9_M3T1 in component kinetic_parameters (second_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,10) = strpad('v10 in component v10 (flux)');
    LEGEND_STATES(:,12) = strpad('pM9_T1_M3 in component pM9_T1_M3 (molar)');
    LEGEND_CONSTANTS(:,17) = strpad('kon_M3_pM9T1 in component kinetic_parameters (second_order_rate_constant)');
    LEGEND_CONSTANTS(:,18) = strpad('koff_M3_pM9T1 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,11) = strpad('v11 in component v11 (flux)');
    LEGEND_CONSTANTS(:,19) = strpad('kon_pM9T1M3 in component kinetic_parameters (second_order_rate_constant)');
    LEGEND_CONSTANTS(:,20) = strpad('koff_pM9T1M3 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,12) = strpad('v12 in component v12 (flux)');
    LEGEND_STATES(:,13) = strpad('M3_pM9_T1_M3 in component M3_pM9_T1_M3 (molar)');
    LEGEND_CONSTANTS(:,21) = strpad('kon_M3pM9T1M3 in component kinetic_parameters (second_order_rate_constant)');
    LEGEND_CONSTANTS(:,22) = strpad('koff_M3pM9T1M3 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,13) = strpad('v13 in component v13 (flux)');
    LEGEND_CONSTANTS(:,23) = strpad('kact_M3pM9T1M3 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,14) = strpad('v14 in component v14 (flux)');
    LEGEND_CONSTANTS(:,24) = strpad('kact_M9T1M3 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,15) = strpad('v15 in component v15 (flux)');
    LEGEND_STATES(:,14) = strpad('Tr in component Tr (molar)');
    LEGEND_STATES(:,15) = strpad('Tr_pM9 in component Tr_pM9 (molar)');
    LEGEND_CONSTANTS(:,25) = strpad('kon_TrpM9 in component kinetic_parameters (second_order_rate_constant)');
    LEGEND_CONSTANTS(:,26) = strpad('koff_TrpM9 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,16) = strpad('v16 in component v16 (flux)');
    LEGEND_CONSTANTS(:,27) = strpad('kact_TrpM9 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,17) = strpad('v17 in component v17 (flux)');
    LEGEND_STATES(:,16) = strpad('Tr_pM9_T1 in component Tr_pM9_T1 (molar)');
    LEGEND_CONSTANTS(:,28) = strpad('kon_TrpM9T1 in component kinetic_parameters (second_order_rate_constant)');
    LEGEND_CONSTANTS(:,29) = strpad('koff_TrpM9T1 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,18) = strpad('v18 in component v18 (flux)');
    LEGEND_CONSTANTS(:,30) = strpad('kact_TrpM9T1 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,19) = strpad('v19 in component v19 (flux)');
    LEGEND_STATES(:,17) = strpad('Tr_pM9_T1_M3 in component Tr_pM9_T1_M3 (molar)');
    LEGEND_CONSTANTS(:,31) = strpad('kon_TrpM9T1M3 in component kinetic_parameters (second_order_rate_constant)');
    LEGEND_CONSTANTS(:,32) = strpad('koff_TrpM9T1M3 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_ALGEBRAIC(:,20) = strpad('v20 in component v20 (flux)');
    LEGEND_CONSTANTS(:,33) = strpad('kact_TrpM9T1M3 in component kinetic_parameters (first_order_rate_constant)');
    LEGEND_RATES(:,1) = strpad('d/dt pM9 in component pM9 (molar)');
    LEGEND_RATES(:,2) = strpad('d/dt M3 in component M3 (molar)');
    LEGEND_RATES(:,3) = strpad('d/dt M3_pM9 in component M3_pM9 (molar)');
    LEGEND_RATES(:,5) = strpad('d/dt T1 in component T1 (molar)');
    LEGEND_RATES(:,4) = strpad('d/dt M3_T1 in component M3_T1 (molar)');
    LEGEND_RATES(:,6) = strpad('d/dt pM9_T1 in component pM9_T1 (molar)');
    LEGEND_RATES(:,7) = strpad('d/dt M3_pM9_T1 in component M3_pM9_T1 (molar)');
    LEGEND_RATES(:,8) = strpad('d/dt M9_T1_star in component M9_T1_star (molar)');
    LEGEND_RATES(:,9) = strpad('d/dt M9 in component M9 (molar)');
    LEGEND_RATES(:,10) = strpad('d/dt M9_T1 in component M9_T1 (molar)');
    LEGEND_RATES(:,12) = strpad('d/dt pM9_T1_M3 in component pM9_T1_M3 (molar)');
    LEGEND_RATES(:,13) = strpad('d/dt M3_pM9_T1_M3 in component M3_pM9_T1_M3 (molar)');
    LEGEND_RATES(:,11) = strpad('d/dt M9_T1_M3 in component M9_T1_M3 (molar)');
    LEGEND_RATES(:,14) = strpad('d/dt Tr in component Tr (molar)');
    LEGEND_RATES(:,15) = strpad('d/dt Tr_pM9 in component Tr_pM9 (molar)');
    LEGEND_RATES(:,16) = strpad('d/dt Tr_pM9_T1 in component Tr_pM9_T1 (molar)');
    LEGEND_RATES(:,17) = strpad('d/dt Tr_pM9_T1_M3 in component Tr_pM9_T1_M3 (molar)');
    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) = 3e-7;
    STATES(:,2) = 5e-8;
    STATES(:,3) = 0;
    CONSTANTS(:,1) = 1e4;
    CONSTANTS(:,2) = 0.001;
    CONSTANTS(:,3) = 0.0019;
    STATES(:,4) = 0;
    STATES(:,5) = 3e-7;
    CONSTANTS(:,4) = 1.9e6;
    CONSTANTS(:,5) = 1.26e-4;
    STATES(:,6) = 0;
    CONSTANTS(:,6) = 3.4e4;
    CONSTANTS(:,7) = 7.48e-5;
    STATES(:,7) = 0;
    CONSTANTS(:,8) = 1e4;
    CONSTANTS(:,9) = 0.001;
    CONSTANTS(:,10) = 0.00057;
    STATES(:,8) = 0;
    STATES(:,9) = 0;
    CONSTANTS(:,11) = 5.6e6;
    CONSTANTS(:,12) = 1.6e-5;
    STATES(:,10) = 0;
    CONSTANTS(:,13) = 6.3e-4;
    CONSTANTS(:,14) = 2.5e-4;
    STATES(:,11) = 0;
    CONSTANTS(:,15) = 7.48e-5;
    CONSTANTS(:,16) = 3.4e4;
    STATES(:,12) = 0;
    CONSTANTS(:,17) = 1.9e6;
    CONSTANTS(:,18) = 1.26e-4;
    CONSTANTS(:,19) = 3.4e4;
    CONSTANTS(:,20) = 7.48e-5;
    STATES(:,13) = 0;
    CONSTANTS(:,21) = 1e4;
    CONSTANTS(:,22) = 0.001;
    CONSTANTS(:,23) = 0.00057;
    CONSTANTS(:,24) = 1.26e-4;
    STATES(:,14) = 1e-7;
    STATES(:,15) = 0;
    CONSTANTS(:,25) = 1e4;
    CONSTANTS(:,26) = 0.007;
    CONSTANTS(:,27) = 0.002;
    STATES(:,16) = 0;
    CONSTANTS(:,28) = 1e4;
    CONSTANTS(:,29) = 0.007;
    CONSTANTS(:,30) = 0.0006;
    STATES(:,17) = 0;
    CONSTANTS(:,31) = 1e4;
    CONSTANTS(:,32) = 0.007;
    CONSTANTS(:,33) = 0.0006;
    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(:,1) =  CONSTANTS(:,1).*STATES(:,2).*STATES(:,1) -  CONSTANTS(:,2).*STATES(:,3);
    ALGEBRAIC(:,2) =  CONSTANTS(:,3).*STATES(:,3);
    RATES(:,3) = ALGEBRAIC(:,1) - ALGEBRAIC(:,2);
    ALGEBRAIC(:,5) =  CONSTANTS(:,8).*STATES(:,6).*STATES(:,2) -  CONSTANTS(:,9).*STATES(:,7);
    ALGEBRAIC(:,6) =  CONSTANTS(:,10).*STATES(:,7);
    RATES(:,7) = ALGEBRAIC(:,5) - ALGEBRAIC(:,6);
    ALGEBRAIC(:,3) =  CONSTANTS(:,4).*STATES(:,2).*STATES(:,5) -  CONSTANTS(:,5).*STATES(:,4);
    ALGEBRAIC(:,4) =  CONSTANTS(:,6).*STATES(:,1).*STATES(:,5) -  CONSTANTS(:,7).*STATES(:,6);
    ALGEBRAIC(:,7) =  CONSTANTS(:,11).*STATES(:,5).*STATES(:,9) -  CONSTANTS(:,12).*STATES(:,8);
    RATES(:,5) =  - (ALGEBRAIC(:,3)+ALGEBRAIC(:,4)+ALGEBRAIC(:,7));
    ALGEBRAIC(:,9) =  CONSTANTS(:,15).*STATES(:,11) -  CONSTANTS(:,16).*STATES(:,9).*STATES(:,4);
    ALGEBRAIC(:,11) =  CONSTANTS(:,19).*STATES(:,1).*STATES(:,4) -  CONSTANTS(:,20).*STATES(:,12);
    RATES(:,4) = (ALGEBRAIC(:,3)+ALGEBRAIC(:,9)) - ALGEBRAIC(:,11);
    ALGEBRAIC(:,12) =  CONSTANTS(:,21).*STATES(:,2).*STATES(:,12) -  CONSTANTS(:,22).*STATES(:,13);
    ALGEBRAIC(:,13) =  CONSTANTS(:,23).*STATES(:,13);
    RATES(:,13) = ALGEBRAIC(:,12) - ALGEBRAIC(:,13);
    ALGEBRAIC(:,10) =  CONSTANTS(:,17).*STATES(:,6).*STATES(:,2) -  CONSTANTS(:,18).*STATES(:,12);
    ALGEBRAIC(:,14) =  CONSTANTS(:,24).*STATES(:,11);
    RATES(:,2) = (ALGEBRAIC(:,2)+ALGEBRAIC(:,6)+ALGEBRAIC(:,13)+ALGEBRAIC(:,14)) - (ALGEBRAIC(:,1)+ALGEBRAIC(:,3)+ALGEBRAIC(:,5)+ALGEBRAIC(:,10)+ALGEBRAIC(:,12));
    ALGEBRAIC(:,8) =  CONSTANTS(:,13).*STATES(:,8) -  CONSTANTS(:,14).*STATES(:,10);
    RATES(:,8) = (ALGEBRAIC(:,7)+ALGEBRAIC(:,14)) - ALGEBRAIC(:,8);
    ALGEBRAIC(:,15) =  CONSTANTS(:,25).*STATES(:,14).*STATES(:,1) -  CONSTANTS(:,26).*STATES(:,15);
    RATES(:,1) =  - (ALGEBRAIC(:,1)+ALGEBRAIC(:,4)+ALGEBRAIC(:,15)+ALGEBRAIC(:,11));
    ALGEBRAIC(:,16) =  CONSTANTS(:,27).*STATES(:,15);
    RATES(:,9) = (ALGEBRAIC(:,2)+ALGEBRAIC(:,9)+ALGEBRAIC(:,16)) - ALGEBRAIC(:,7);
    RATES(:,15) = ALGEBRAIC(:,15) - ALGEBRAIC(:,16);
    ALGEBRAIC(:,17) =  CONSTANTS(:,28).*STATES(:,6).*STATES(:,14) -  CONSTANTS(:,29).*STATES(:,16);
    RATES(:,6) = ALGEBRAIC(:,4) - (ALGEBRAIC(:,5)+ALGEBRAIC(:,10)+ALGEBRAIC(:,17));
    ALGEBRAIC(:,18) =  CONSTANTS(:,30).*STATES(:,16);
    RATES(:,10) = ALGEBRAIC(:,8)+ALGEBRAIC(:,18);
    RATES(:,16) = ALGEBRAIC(:,17) - ALGEBRAIC(:,18);
    ALGEBRAIC(:,19) =  CONSTANTS(:,31).*STATES(:,14).*STATES(:,12) -  CONSTANTS(:,32).*STATES(:,17);
    RATES(:,12) = (ALGEBRAIC(:,10)+ALGEBRAIC(:,11)) - (ALGEBRAIC(:,12)+ALGEBRAIC(:,19));
    ALGEBRAIC(:,20) =  CONSTANTS(:,33).*STATES(:,17);
    RATES(:,11) = (ALGEBRAIC(:,13)+ALGEBRAIC(:,20)) - (ALGEBRAIC(:,14)+ALGEBRAIC(:,9));
    RATES(:,14) = (ALGEBRAIC(:,16)+ALGEBRAIC(:,18)+ALGEBRAIC(:,20)) - (ALGEBRAIC(:,15)+ALGEBRAIC(:,17)+ALGEBRAIC(:,19));
    RATES(:,17) = ALGEBRAIC(:,19) - ALGEBRAIC(:,20);
   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) =  CONSTANTS(:,1).*STATES(:,2).*STATES(:,1) -  CONSTANTS(:,2).*STATES(:,3);
    ALGEBRAIC(:,2) =  CONSTANTS(:,3).*STATES(:,3);
    ALGEBRAIC(:,5) =  CONSTANTS(:,8).*STATES(:,6).*STATES(:,2) -  CONSTANTS(:,9).*STATES(:,7);
    ALGEBRAIC(:,6) =  CONSTANTS(:,10).*STATES(:,7);
    ALGEBRAIC(:,3) =  CONSTANTS(:,4).*STATES(:,2).*STATES(:,5) -  CONSTANTS(:,5).*STATES(:,4);
    ALGEBRAIC(:,4) =  CONSTANTS(:,6).*STATES(:,1).*STATES(:,5) -  CONSTANTS(:,7).*STATES(:,6);
    ALGEBRAIC(:,7) =  CONSTANTS(:,11).*STATES(:,5).*STATES(:,9) -  CONSTANTS(:,12).*STATES(:,8);
    ALGEBRAIC(:,9) =  CONSTANTS(:,15).*STATES(:,11) -  CONSTANTS(:,16).*STATES(:,9).*STATES(:,4);
    ALGEBRAIC(:,11) =  CONSTANTS(:,19).*STATES(:,1).*STATES(:,4) -  CONSTANTS(:,20).*STATES(:,12);
    ALGEBRAIC(:,12) =  CONSTANTS(:,21).*STATES(:,2).*STATES(:,12) -  CONSTANTS(:,22).*STATES(:,13);
    ALGEBRAIC(:,13) =  CONSTANTS(:,23).*STATES(:,13);
    ALGEBRAIC(:,10) =  CONSTANTS(:,17).*STATES(:,6).*STATES(:,2) -  CONSTANTS(:,18).*STATES(:,12);
    ALGEBRAIC(:,14) =  CONSTANTS(:,24).*STATES(:,11);
    ALGEBRAIC(:,8) =  CONSTANTS(:,13).*STATES(:,8) -  CONSTANTS(:,14).*STATES(:,10);
    ALGEBRAIC(:,15) =  CONSTANTS(:,25).*STATES(:,14).*STATES(:,1) -  CONSTANTS(:,26).*STATES(:,15);
    ALGEBRAIC(:,16) =  CONSTANTS(:,27).*STATES(:,15);
    ALGEBRAIC(:,17) =  CONSTANTS(:,28).*STATES(:,6).*STATES(:,14) -  CONSTANTS(:,29).*STATES(:,16);
    ALGEBRAIC(:,18) =  CONSTANTS(:,30).*STATES(:,16);
    ALGEBRAIC(:,19) =  CONSTANTS(:,31).*STATES(:,14).*STATES(:,12) -  CONSTANTS(:,32).*STATES(:,17);
    ALGEBRAIC(:,20) =  CONSTANTS(:,33).*STATES(:,17);
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