Input formula to be used in a function

Hi all,

I have to write a function that can input different f(x) formulas and then use that formula to get solve for some variable in an output. I haven't been able to find anything that quite applies to what I'm trying to do. Any help is appreciated.

Ex.

function v = functionname(formula,a,b,c,d) %formula could be f(x) = x^2 + 2 or whatever
%I want to use the formula and other inputs to get an output
end

Answer 1

[Jeremy]

It sounds like you want

polyval

?

[Jeremy]

Without using polyval, something like this is working for me

function f = eval_eq(eq,a)
    
    x = linspace(0,1,101);
    f = eq(x,a);
    plot(x,f)
    
end

and then call this with

y = @(x,a) a*x + 1;
f = eval_eq(y,2);

Seems a little out of the way to get it done though. I think just calling the anonymous function in the script is easier than passing it into a function

Answer 2

[darova]

Use function handle

function main
f = @(x) 2*x + 1;                % function handle
func(f,2,3)
    function res = func(f,a,b)
        res = f(a)+b;
    end
end