Creating a set of equations programmatically
1 view (last 30 days)
Show older comments
I am trying to create a set of terms programmatically in order to build up a set of equations later in the code. The equations are supposed to be stored in Q. The vectors a and b are fixed parameters and vector T is the unknown variable.
n = 5;
a = [6 5 4 3 2 1];
b = [1 2 3 4 5 6];
L = 3;
k = 1;
while k<=n
Q{k,1} = @(T) a(k)*b(k)/L*(T(k+1)-T(k));
k = k+1;
end
Q
What happens when I run the code is that the information in k is passed in the index of Q (so that the terms are stored in different rows) but not in the index of a,b and T:
Q =
5×1 cell array
{@(T)a(k)*b(k)/L*(T(k+1)-T(k))}
{@(T)a(k)*b(k)/L*(T(k+1)-T(k))}
{@(T)a(k)*b(k)/L*(T(k+1)-T(k))}
{@(T)a(k)*b(k)/L*(T(k+1)-T(k))}
{@(T)a(k)*b(k)/L*(T(k+1)-T(k))}
For my purpose I'd like to get an output like this:
Q =
5×1 cell array
{@(T)a(1)*b(1)/L*(T(2)-T(1))}
{@(T)a(2)*b(2)/L*(T(3)-T(2))}
{@(T)a(3)*b(3)/L*(T(4)-T(3))}
{@(T)a(4)*b(4)/L*(T(5)-T(4))}
{@(T)a(5)*b(5)/L*(T(6)-T(5))}
Does anyone have an idea how to get this output?
3 Comments
Accepted Answer
More Answers (1)
Adam Danz
on 22 Oct 2018
Edited: Adam Danz
on 22 Oct 2018
See Matt J's response. This solution will print the values you described by uses sprintf() and str2func().
n = 5;
a = [6 5 4 3 2 1];
b = [1 2 3 4 5 6];
L = 3;
k = 1;
while k<=n
Q{k,1} = str2func(sprintf('@(T) a(%d)*b(%d)/L*(T(%d)-T(%d));', k,k,k+1,k));
k = k+1;
end
See Also
Categories
Find more on Matrix Indexing in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!