how to write a function for quadratic equation
168 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Alisha Mistry
am 6 Dez. 2019
Kommentiert: Image Analyst
am 7 Dez. 2019
I wrote this into matlab but it doesn't work, can someone explain why?
function [x1,x2] = QuadraticEquation (a,b,c)
d=b^2-4*a*c;
if d>=0
disp ('two roots exist')
x1=(-b-sqrt(d))/2*a
x2=(-b+sqrt(d))/2*a
plot(x1,0,'rx',x2,0,'rx')
hold on
x=-10:10
y=a*x.^2+b*x+c
plot(x,y)
hold off
else
disp ('no real roots’)
end
3 Kommentare
Image Analyst
am 7 Dez. 2019
You need to pass in something. You can't just click the green Run triangle on the toolbar. See Matt J's Answer below.
Akzeptierte Antwort
Matt J
am 7 Dez. 2019
Bearbeitet: Matt J
am 7 Dez. 2019
[x1,x2] = QuadraticEquation (1,-2,0)
function [x1,x2] = QuadraticEquation (a,b,c)
d=b^2-4*a*c;
if d>=0
disp ('real roots exist')
x1=(-b-sqrt(d))/(2*a); %<---------- brackets in denominator
x2=(-b+sqrt(d))/(2*a); %<---------- brackets in denominator
plot(x1,0,'rx',x2,0,'rx')
hold on
fplot(@(x) a*x.^2+b*x+c) %<---------- fplot is more convenient here
hold off
else
disp ('no real roots') %<---------- missing quote
[x1,x2]=deal([]) %<---------- missing default assignment
end
end
0 Kommentare
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Introduction to Installation and Licensing finden Sie in Help Center und File Exchange
Produkte
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!