Create an array of values of different values of an equation that depends of a list of parameters

Hi,

Im currently tryng to solve a problem where I need to calculate q for diferent values of dx . Basically I just want to evaluate de expresion of q for every x. The code for that that I'm using is the following:

function out = heat(dx)

syms x

f = a*x^2 + b*x +c;

out = subs(f, x, dx);

out = double(out);

end

My intention is to create a for loop to fill the values of q in order to use it later in the main code, something like (:

for dx=1:10

q(i) = heat(dx) % q(i) is the the exresion f evaluated at dx

end

The problem that I have is that the parameters a, b and c are in reality defined in the main script so the function depends on those parameters.

I tryed to create a nested function but I still havent managed to find a solution. And honestly I have no idea how to do it.

How do I evaluate this dependend- parameter function and fill the array of values of my vairable q ?

Answer 1

[Milan Bansal]

Hi,

As per my understanding, you have created a function which is dependent on some parameters that are defined in a main script.

In order to use those parameters in the function, pass them in the function as arguments. Modify your function as shown in the code below.

function out = heat(dx,a,b,c)
    syms x
    f = a*x^2 + b*x +c;
    out = subs(f, x, dx);
    out = double(out);
end

To use this function in the "for" loop, modify the code in the main script.

for dx=1:10
    q(i) = heat(dx,a,b,c) % q(i) is the the expression f evaluated at dx
    
end

Refer to the documentation link to know more about MATLAB Functions.

https://www.mathworks.com/help/matlab/ref/function.html