Quadratic question using the function command

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Chris
Chris on 25 Jun 2013
Commented: Walter Roberson on 27 Dec 2019
Without using the roots command, write a function to calculate roots of the quadratic equation
ax^2+bx+c
Inputs to the function should be the coefficients a, b and c and output should
be the roots. Test your program by setting a=2, b=3 and c= -1
So I know i have to have two files. One with the quadratic equations and the other script recalls the function. Heres What I have so far.
function x=quad_equation(a,b,c)
x(1)=(-b+sqrt(b.^2-4.*a.*c))/(2.*a)
x(2)=(-b-sqrt(b.^2-4.*a.*c))/(2.*a)
Thats the first file
a=3;
b=3;
c=-1;
function outputs=quad_equation(a,b,c)
output=fzero(
And I am lost on what to do with the second file

Accepted Answer

Walter Roberson
Walter Roberson on 25 Jun 2013
In MATLAB, files that define functions must have "function" as the first non-comment word in the file; if you put assignments before the "function" statement then you will get an error about function definitions not permitted in that context.
  2 Comments
Walter Roberson
Walter Roberson on 27 Dec 2019
function fx = quad_function
a=3;
b=2;
c=-1;
fx = quad_equation(a, b, c);
end

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More Answers (1)

abhirup chowdhury
abhirup chowdhury on 27 Dec 2019
function fx=quad_function(a,b,c)
a=3
b=2
c=-1
a_root=fzero(quad_function,a)
b_root=fzero(fx,b)
c_root=fzero(fx,c)
  1 Comment
Walter Roberson
Walter Roberson on 27 Dec 2019
Yes? That duplicates what Chris posted in 2013 ?

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