MATLAB Answers

Samson
0

Unable to perform assignment

Asked by Samson
on 28 Jun 2019
Latest activity Edited by Jan
on 28 Jun 2019
Accepted Answer by Jan
From my attached code and get the following error
Unable to perform assignment because the left and right sides have a different number of elements.
Error in aa1 (line 12)
*Y(i)yo=utput;
a= 0.2; b= 0.2; c = 5.7;
% initial condition
yo = [0.5;0.5;1];
% computing the trajectory
dt = 0.01;
tspan = (dt:dt:100);
yinput = yo;
Y = zeros(tspan(end)/dt,1);
for i = 1: tspan(end)/dt
time = i*dt;
youtput = rk4angelstepb(@rosslerb,dt,yinput,a,b,c);
Y(i) = youtput;
yinput = youtput;
end

  1 Comment

Adam
on 28 Jun 2019
You can see what size things are with a breakpoint, or using the stop on errors option and testing on command line when it stops. It's a valuable resource for finding these problems. How you solve them is very situation dependent, but the error message says what is wrong and what is expected in this case.

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1 Answer

Jan
Answer by Jan
on 28 Jun 2019
Edited by Jan
on 28 Jun 2019
 Accepted Answer

If the initial condition has 3 elements: yo = [0.5;0.5;1], te evaluated trajectory will have 3 elements per time step also. Then you need most likely:
Y = zeros(3, tspan(end)/dt);
for i = 1: tspan(end)/dt
time = i*dt;
youtput = rk4angelstepb(@rosslerb,dt,yinput,a,b,c);
Y(:, i) = youtput;
...

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