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version 1.1.0.0 (8.26 KB) by Diego Barragán

### Diego Barragán (view profile)

Updated 10 Feb 2009

Enter the coefficients for the Ax2 + Bx + C = 0 equation and Quadratic Equation will output the solutions and plot(if they are not imaginary).

### Cite As

Diego Barragán (2020). Quadratic Equation Calculator (https://www.mathworks.com/matlabcentral/fileexchange/22935-quadratic-equation-calculator), MATLAB Central File Exchange. Retrieved .

Guillermo Quintas

Husam Aldahiyat

### Husam Aldahiyat (view profile)

While you do that why not add more features, like roots of a function regardless of its order or something else. You can use the MATLAB function roots which will help immensly.

Currently, even if you fix these mistakes, it's still very bare bones and needs more features.

Diego Barragán

### Diego Barragán (view profile)

Hi Husam and Matt Fig, thanks a lot for review my program "Quadratic Equation Calculator". I will change it.

Regards, Diego.

Matt Fig

### Matt Fig (view profile)

I gave two stars because by running this program, the root is changed then not changed back. That is not a good way to make users of your code happy. When the user closes the GUI, you need to set colordef back to what it was prior to initialization. I will change my rating when this is fixed.

Matt Fig

### Matt Fig (view profile)

In the lines where you calculate the quadratic formula, you need a parenthesis around the 2*a, like this;
x1=(-b+sqrt(b^2-4*a*c))/(2*a)
x2=(-b-sqrt(b^2-4*a*c))/(2*a)
Otherwise your solutions are only valid for a = 1.

Husam Aldahiyat

### Husam Aldahiyat (view profile)

Enter [3 5 2] as values for [A B C] and you'll get messed up results. Same for [2 5 2].