Help with quadriatic formula?
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Hi everyone,
We are to create a function using the editor to solve a quadratic formula. The hard part is the user is to be able to input just the equation ie: Ax^2+Bx+C=0 (not the values of ABC). (Below is what I have so far)
____***_*%The user input the formula they want solved_____
function [xpos, xneg] = Roots(equation)
%Quadratic equation format is = Ax^2 + Bx + C = 0
A = strtok(equation, 'x');
B =
C =
%This is the discriminant
D = B .^2 - 4 .* A .* C;
%These are the equation to find the positive and negative values of x
xpos = (-B + sqrt(D)) ./ (2 .* A)
xneg = (-B - sqrt(D)) ./ (2 .* A)
end
3 Comments
Daniel Shub
on 17 Sep 2013
There are lots of parsers for quadratic equations based on regular expressions. This might be easier than using strtok
dpb
on 17 Sep 2013
Oh, indeed! The OPs instructor is, however, apparently not amenable to alternate solutions than those suggested based on his comments later on.
Accepted Answer
dpb
on 12 Sep 2013
You showed enough I'll do more than normally would on first response...
s=inputdlg('Enter quadratic: ','Quadratic Solver Input',1,{'ax^2+bx+c'});
8 Comments
dpb
on 17 Oct 2013
The form doesn't fit the required input of an explicit constant.
Only way to deal with it will be to special-case it.
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