Function with two inputs and arguments

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Jonathan Larsson
Jonathan Larsson 2019-10-8
编辑： Fabio Freschi 2019-10-8
Hello I am stuck on a problem. I am supposed to make a function that solves quadratic equations. If however the function gives complex numbers, it is supposed to give me the anwsers x1=888, x2=888. How do I do this?
ax2bxc0.png
x1ochx2.png
if b24ac0.png then xpxm.png
I tried;
function [xp,xm] = find_roots(a,b,c)
if b^2-4*a*c<0
xp=888 & xm=888
else
xp=(-b/(2*a))+sqrt(b^2-4*a*c)/(2*a)
xm=(-b/(2*a))-sqrt(b^2-4*a*c)/(2*a)
end % end function
However it if far from the right anwser. I basically don't know how to do arguments in a function. I even tried the "==" in the if/else statement in my function and it still did not work.
Can anyone help me?
Thanks in advance!

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采纳的回答

Fabio Freschi
Fabio Freschi 2019-10-8
编辑：Fabio Freschi 2019-10-8
The & is misused. Try:
function [xp,xm] = find_roots(a,b,c)
if b^2-4*a*c<0
xp=888;
xm=888;
else
xp=(-b/(2*a))+sqrt(b^2-4*a*c)/(2*a);
xm=(-b/(2*a))-sqrt(b^2-4*a*c)/(2*a);
end
Also have a look at the built-in roots
doc roots

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