Without using the roots command, write a function to calculate roots of the quadratic equation
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Without using the roots command, write a function to calculate roots of the quadratic equation
ax^2+bx+c=0
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,c=-1
can someone help me out with this? I cant think of anything but roots to use. would I have to use poly? or fzero?
采纳的回答
Evan
2013-6-24
0 个投票
No need to call any built-in function. Just write your own using the quadratic formula.
更多回答（2 个）
James Tursa
2013-6-24
0 个投票
You can use one of the formulations here:
The quadratic formula is listed, of course, but that is prone to cancellation error. So I would advise impressing your professor by coding up the algorithm under the "Avoiding loss of significance" section.
2 个评论
Chris
2013-6-24
James Tursa
2013-6-25
It would be best if you could post what you have so far and then we can comment on it and suggest improvements. E.g., a function outline would be this (e.g., put in a file called quadratic_roots.m):
function [x1 x2] = quadratic_roots(a,b,c)
% add your code here to calculate x1 and x2
return
end
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