how to call a string into a function

2019 1 4
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I am currently working on a GUI wherein you can input numbers then it will graph the answer. The function is a differential equation and im using ode45. How am i going to use the inputted number to the function?
For example:
function dxdt=rhs(t,x);
dxdt= 3*exp(-t);
end
I need the 3 there to be a user inputted number.
I will really appreciate it. Thank you so much :)

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