()-indexing must appear last in an index expression

[Bob]

Hi guys!

-------------------------------------------------------------------------
[time,z]=ode45(@myode,[0 2],z0,options);

for i=time
X_traj=X_traj+z(:,1)(i)*cos(z(:,2)(i)+beta_zero);
end
------------------------------------------------------------------------

where is the mistake? from ode45 I get a matrix with four columns, and I want to do some operation until the integration time runs out.. any idea?

thanks in advance :)

[Matt J]

Post by Bob
where is the mistake? from ode45 I get a matrix with four columns, and I want to do some operation until the integration time runs out.. any idea?

===============

What's this expression supposed to mean: z(:,1)(i) ?

In any case, it's prohibited, as shown more simply in the following

Post by Bob

z(2,2)=5

z =

0 0
0 5

Post by Bob

z(:,1)(1)=0

??? Error: ()-indexing must appear last in an index expression.

[Bob]

Post by Matt J

Post by Bob
where is the mistake? from ode45 I get a matrix with four columns, and I want to do some operation until the integration time runs out.. any idea?

===============
What's this expression supposed to mean: z(:,1)(i) ?
In any case, it's prohibited, as shown more simply in the following

Post by Bob

z(2,2)=5

z =
0 0
0 5

Post by Bob

z(:,1)(1)=0

??? Error: ()-indexing must appear last in an index expression.

Ergo?
For example, my ode gives me 4 outputs for every istant:


t1-----a1- b1-c1-d1
t2-----a2-b2-c2-d2
.
.
.
tN----aN-bN-cN-dN

I want to:
X1=X0+a1*b1
X2=X1+a2*b2
.
.
XN=X(N-1)+aN*bN

and then to plot X(i)..

How can do this using "for"?
I hope it's clear what I would get!

[Matt J]

Post by Bob
X1=X0+a1*b1
X2=X1+a2*b2
.
.
XN=X(N-1)+aN*bN
and then to plot X(i)..
How can do this using "for"?

==============



X=zeros(N+1,1);
X(1)=X0;

for i=1:N
X(i+1)=X(i)+a(i)*b(i)
end

X(1)=[];

plot(t,X)

[Bob]

Post by Matt J

Post by Bob
X1=X0+a1*b1
X2=X1+a2*b2
.
.
XN=X(N-1)+aN*bN
and then to plot X(i)..
How can do this using "for"?

==============
X=zeros(N+1,1);
X(1)=X0;
for i=1:N
X(i+1)=X(i)+a(i)*b(i)
end
X(1)=[];
plot(t,X)

THANKSSS! :)
now, if I want to insert an image that moves along the line? to be more clear, want a plot like this:
http://www.mathworks.com/matlabcentral/fileexchange/4572-trajectory-and-attitude-plot-version-2
How can I do it? I noticed that the planes are .mat, how do you create? is there a database that contains other vehicles?
thanks again! :)

[Matt J]

Post by Bob
http://www.mathworks.com/matlabcentral/fileexchange/4572-trajectory-and-attitude-plot-version-2

============

Might be a good idea to contact the author for advice on how to modify it.