Creating a set of equations programmatically
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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 个评论
Lennart Vogt
2018-10-23
Matt J
2018-10-23
That would be true only if you plan to change a and b later.
Lennart Vogt
2018-10-23
采纳的回答
Your code already works fine. Each anonymous function Q{k} will use a different value for k, even if that isn't printed to the screen.
更多回答（1 个）
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
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