Quadratic question using the function command

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Chris
Chris 2013-6-25
评论： Walter Roberson 2019-12-27
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

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采纳的回答

Walter Roberson
Walter Roberson 2013-6-25
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 个评论
Chris
Chris 2013-6-25
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)
Alrght so I got this but how do I find the roots of the function?
Walter Roberson
Walter Roberson 2019-12-27
function fx = quad_function
a=3;
b=2;
c=-1;
fx = quad_equation(a, b, c);
end

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更多回答（1 个）

abhirup chowdhury
abhirup chowdhury 2019-12-27
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)

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