parametric plot with values of parameter on plot

3 vues (au cours des 30 derniers jours)
Mohsen
Mohsen le 18 Mar 2014
Réponse apportée : mehran le 20 Sep 2023
I want to graph x=f(t) and y=g(t) but I want some sampling of values of t on the graph. Is there an option of plot command or a specialized program for doing this? So for example say x=cos(t), y=sin(t). I want to annotate the graph by putting t=0, t=pi/6, t=pi/4, etc on the graph. Of course this can be done by adding many text boxes to the graph but I was looking for a more automated solution.
  1 commentaire
Salaheddin Hosseinzadeh
Salaheddin Hosseinzadeh le 19 Mar 2014
Oh! Now I see what you're looking for. Unfortunately I don't know about an automated solution, all I can think of, is to write my own code to add annotations or text to the graph! But I don't think if that's gonna be ver usefull and beneficial code for me! :(
Sorry!

Connectez-vous pour commenter.

Réponses (2)

Mischa Kim
Mischa Kim le 19 Mar 2014
Modifié(e) : Mischa Kim le 19 Mar 2014
Mohsen, would this do (using ticks and tick labels)?
t = -pi:.1:pi;
y = sin(t);
plot(t,y)
set(gca,'XTick',-pi:pi/2:pi)
set(gca,'XTickLabel',{'t=-pi','t=-pi/2','t=0','t=pi/2','t=pi'})
  1 commentaire
Mohsen
Mohsen le 19 Mar 2014
The labels are to be on the graph, not on the axis. So for example x= cos(t) y= sin(t) will make a circle and on various points of the circle we want to write the value of parameter t. In general x=f(t), y=g(t) and t has a range of values. We want the the t values on the (x,y) plot.

Connectez-vous pour commenter.


mehran
mehran le 20 Sep 2023
t = linspace(0, 10*pi, 500);
x = 3*t.*cos(t);
y = 3*t.*sin(t);
figure(3);
plot(x,y);
hold on;
vec1=1:20:floor(length(t)/2);
vec2=floor(length(t)/2)+1:10:length(t);
vec=[vec1 vec2];
for ii = 1:length(vec)
txt=sprintf('t=%4.2f',t(ii));
text(x(vec(ii)), y(vec(ii)),txt, 'HorizontalAlignment','left');
end
xlabel('x');
ylabel('y');
title('spiral parametric curve with sample parameter values shown')

Catégories

En savoir plus sur Line Plots dans Help Center et File Exchange

Produits

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by