清空筛选条件
清空筛选条件

why doesn't any data show up on my figure?

1 次查看（过去 30 天）
Michael
Michael 2012-11-24
i'm trying to make a basic 4-bar linkage position tracking graph, but the graph shows up blank when i run it. any help?
% Lengths of Linkages
a=269.755;
b=182.014;
c=345.91;
d=154.91;
e=110.524;
% Initial Angles
theta0=0.544892;
theta20=2.504722;
theta30=0.612262;
alpha=0.559028959;
% J-Values & Geometry Calculations
j1=d/a;
j2=d/c;
j3=(a^2 - b^2 + c^2 + d^2)/(2*a*c);
j4=d/b;
j5=(c^2 - d^2 - a^2 - b^2)/(2*a*b);
q=atan((a*sin(theta20))/(d-(a*cos(theta20))));
f=sqrt(a^2 +d^2 - 2*a*d*cos(theta20));
p=atan((sqrt(4*b^2*f^2 - (b^2 + f^2 - c^2)^2))/(b^2 +f^2 - c^2));
% Coupler Position
xc=a*cos(theta20) + e*cos(p-q+alpha);
yc=a*sin(theta20) + e*sin(p-q+alpha);
z=-xc*cos(theta0) - yc*sin(theta0);
% Range Of Input Angles
theta2=[(theta20-(degtorad(45))):pi/180:(theta20+(degtorad(45)))];
% Loop
for i=theta2;
D=j5-j1+((1+j4)*cos(i));
E=-2*sin(i);
F=j5+j1-((1-j4)*cos(i));
theta3=2*atan((-E-sqrt(E^2 - 4*D*F))/(2*D));
camber=radtodeg(theta3-theta30);
q1=atan((a*sin(i))/(d-(a*cos(i))));
f1=sqrt(a^2 +d^2 - 2*a*d*cos(i));
p1=atan((sqrt(4*b^2*f1^2 - (b^2 + f1^2 - c^2)^2))/(b^2 +f1^2 - c^2));
xc1=a*cos(i) + e*cos(p-q+alpha);
yc1=a*sin(i) + e*sin(p-q+alpha);
z1=-xc1*cos(theta0) - yc1*sin(theta0);
height=z1-z;
end
% Plot Results
figure
grid on
xlabel('camber angle(degrees)','FontSize',18)
ylabel('Wheel Travel(mm)','FontSize',18)
title('Camber Angle With Wheel Travel','FontSize',20)
plot(camber,height)
i'm pretty new to matlab so any help would be much appreciated. Cheers Michael

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2012-11-24
You overwrite camber and height each time through the "for i" loop.
camber = []; height = [];
for i = theta2
...
camber(end+1) = radtodeg(....)
[...]
height(end+1) = z1-z;
end

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Graphics Performance 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by