MATLAB: How to get a single value of an array through a function inside a script

array inside functionfunctionglobal variableMATLABscript

Hello,
I have two questions, how can we use a variable defined in a script to be used later inside a function in the same script?
2nd, I am having trouble in trying to get a single value of an array which is processed inside a function inside a script. The function should return the u'th value of the array gE by storing it in the Eg(function return) but I get an error of
Index exceeds matrix dimensions.
Error in Slab_002>Esrc (line 187)
Eg = gE(u);
How can we fix this? All answers are welcome.
script something something
a = something;
gE = zeros(1, something);
dt = something;
STEPS = something;
function Eg = Esrc(u)
    
    a = dt*u;             %% I want to use the a that is defined above in the code.
    
    for i = 1:STEPS
        gE(i) = exp(-((t-t0-a)/tau).^2);        
    end
    
    Eg = gE(u);
    
 end

Best Answer

function Eg = Esrc(u,a)
    
    a = dt*u;             %% I want to use the a that is defined above in the code.
    
    for i = 1:STEPS
        gE(i) = exp(-((t-t0-a)/tau).^2);        
    end
    
    Eg = gE(u);
    
 end
Related Question