Subscript indices error when plotting

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Jay
Jay 2017-10-27
评论： Jay 2017-10-31
I am having an issue with a for loop plot. The error is returned on the line that says "plot(x,y)" on the code which follows. It states "Subscript indices must either be real positive integers or logicals." Also, if there is any way to label the plots in a legend as they are created that would be great. Thanks in advance for any help.
for N=30:10:50
g=9.81;tau = 0.0076;
tmin = 0; tmax = 10;
v0=50*sin(deg2rad(N));y0=0;
t=linspace(tmin,tmax, 1000);
dt=t(2)-t(1);
a= zeros(1,numel(t));
v= zeros(1,numel(t));
y= zeros(1,numel(t));
v(1)=v0;
y(1)=y0;
for i=2:1000
a(i-1)= -g+(tau*abs(v(i-1))*v(i-1));
v(i)= v(i-1)+a(i-1)*dt;
y(i)= y(i-1)+v(i-1)*dt+(1/2)*a(i-1)*dt^2;
end
vx0=50*cos(deg2rad(N));x0=0;
ax= zeros(1,numel(t));
vx= zeros(1,numel(t));
x= zeros(1,numel(t));
vx(1)=vx0;
x(1)=x0;
for i=2:1000
ax(i-1)= -tau*(vx(i-1))^2;
vx(i)= vx(i-1)+ax(i-1)*dt;
x(i)= x(i-1)+vx(i-1)*dt+(1/2)*ax(i-1)*dt^2;
end
plot(x,y);
ylim([0,65]);
end

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采纳的回答

Walter Roberson
Walter Roberson 2017-10-28
In some code not shown here, you accidentally assigned a value to a variable named plot
  5 个评论
显示 3更早的评论
Walter Roberson
Walter Roberson 2017-10-30
No, anything that is in your base workspace remains in your base workspace, and any variables you assign in the live script get assigned in the base workspace. Live scripts do not have their own workspace.
Jay
Jay 2017-10-31
Understood. Thank you. You have been very helpful.

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