How can i plot this graph?
7 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
ak
el 3 de Dic. de 2019
Comentada: ak
el 3 de Dic. de 2019
I am trying to plot the graphs of y=-x mod 1 and y=-0.5*cos(2*pi*-x) mod 1. There are two issues here, for some reason there are points for eg x=0.25 where the y value should be 1 but instead theres a line between 0.25 to the next x value. Secondly MATLAB is plotting and straight line on x=0 for the line y=-x mod 1 which doesnt make sense. any help would be appreciated.
clear
clc
clf
syms x y
f1 = y == mod(-0.5*cos(2*pi*-x),1);
f2 = y == mod(-x,1);
%f3 = y == mod(-0.5*cos(2*pi*(-y)),1);
p1 = fimplicit(f1,[-0.5 1.8 0 1]);
hold on
p2 = fimplicit(f2,[-0.5 1.8 0 1]);
%p3= fimplicit(f3,[-2 2 0 1]);
hold off
fsize=15;
title('Intersection of curves','FontSize',fsize)
xlabel('x(t)','FontSize',fsize)
ylabel('y(t)','FontSize',fsize)
%s=vpasolve(mod(y+0.5*cos(2*pi*y),1),mod(x+y,1),[1.7,0.5]);
%s.x
%s.y
% End of Program 05a.
0 comentarios
Respuesta aceptada
Walter Roberson
el 3 de Dic. de 2019
symbolic mod() does not mean what you think it means. When you pass an expression, it takes the mod of each subexpression, leaving any variables untouched, and drops the mod. For example, mod(5*x,3) is 2*x and not mod(2*x,3)
You have to replace your mod() operations with remainder operations such as
mod(A,B) --> A - floor(A/B)*B
(You might need a different expression for negative values of B)
3 comentarios
Walter Roberson
el 3 de Dic. de 2019
syms x y
Mod = @(A,B) A - floor(A/B)*B;
f1 = y == Mod(-0.5*cos(2*pi*-x),1);
f2 = y == Mod(-x,1);
%f3 = y == mod(-0.5*cos(2*pi*(-y)),1);
p1 = fimplicit(f1,[-0.5 1.8 0 1]);
hold on
p2 = fimplicit(f2,[-0.5 1.8 0 1]);
%p3= fimplicit(f3,[-2 2 0 1]);
hold off
fsize=15;
title('Intersection of curves','FontSize',fsize)
xlabel('x(t)','FontSize',fsize)
ylabel('y(t)','FontSize',fsize)
This does not produce the same graph as before for me.
Más respuestas (1)
Marcel Kreuzberg
el 3 de Dic. de 2019
clear
clc
clf
x = -0.5:0.001:1.8;
f2=mod(x,1);
f1=mod(-0.5*cos(2*pi*-x),1);
plot(x,f1,'.');
hold on
plot(x,f2,'.');
hold off
fsize=15;
title('Intersection of curves','FontSize',fsize)
xlabel('x(t)','FontSize',fsize)
ylabel('y(t)','FontSize',fsize)
0 comentarios
Ver también
Categorías
Más información sobre Line Plots en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!