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From: Mirko on 15 Apr 2010 04:48
Hi to all.
I'm following this technical solution posted on matworks website
http://www.mathworks.com/support/solutions/en/data/1-196SD/?solution=1-196SD

In particular the last part using assignin and evalin.
My main function contains this:

global counter;
counter=1;
..
..
..
%ode calling
[time,states]=ode113(@rates,[0,final_time],[initial_conditions]);

Below the rates function
%rates function
..
..
..
fp=some calculation.....;
global counter;
assignin('base','fp',fp);
%at every step the fp variable evaluated in the rates function
%is stored in the main workspace with the same name
evalin('base','fp_array(conteggio,:)=fp;');
%to store the fp variable at every calling of %the ode I store the variable in an array
counter=counter+1;
%increment of the array position
..
..
..
end
My problem is that the fp_array I got, contains exactly twice the values of the integrated states I got from ode.
For example to obtain the rigth plot of fp_array I have to use
plot(time,fp_array(1:2:end,:));
I got what I needed but can someone help me to understand and avoid to obtain the correct fp_array?
Why do I obtain twice values for fp_array?
Thanks
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