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How do I get my code to display the associated x values for maximum and minimum

1 vue (au cours des 30 derniers jours)
In addition, How do I get it to label the coordinates in the graph it makes? I tried getting it to display Xmax or Xmin, but it says not defined.
a = -7.0;
b = 1.0;
c = 2.0;
d = 20.0;
e = 2.0;
f = 5.0;
p = @(x) c * x.^3 + d * x.^2 + e * x + f;
CP = quadratic(3 * c, 2 * d, e);
crit_pt1 = CP(1);
crit_pt2 = CP(2);
if isreal(crit_pt1)
disp('Crit Point 1:');
disp(crit_pt1);
disp('p(Crit Point 1):');
disp(p(crit_pt1));
disp('Crit Point 2:');
disp(crit_pt2);
disp('p(Crit Point 2):');
disp(p(crit_pt2));
else
disp('The critical points are complex.');
end
disp('Left Endpoint:');
disp(a);
disp('p(Left Endpoint):');
disp(p(a));
disp('Right Endpoint:');
disp(b);
disp('p(Right Endpoint):');
disp(p(b));
Q=[p(a),p(b),p(crit_pt1),p(crit_pt2)];
disp('p(Xmax):');
disp(max(Q));
disp('p(Xmin):');
disp(min(Q));
delta = (b - a) / 100;
x = a:delta:b;
y = p(x);
plot(x, y)

Réponse acceptée

Matt J
Matt J le 21 Sep 2014
You can use the text() command. Or, you can do
set(axis_handle,'XTick',whatever)
to have the x-axis show "whatever".
  4 commentaires
cakey
cakey le 22 Sep 2014
Yes, I do not understand the language. Is there anywhere where I can read how to do it?
Matt J
Matt J le 22 Sep 2014
About axis handles? You can start with "doc gca" and pages that it links to.

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