How can I define parameters and set them equal to each other dynamically?

Question

Aaron Zheng 2021-9-23

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https://ww2.mathworks.cn/matlabcentral/answers/1459014-how-can-i-define-parameters-and-set-them-equal-to-each-other-dynamically

回答：埃博拉酱 2024-10-28，15:13

For a high school essay, I have the following problem. I have a set of 24 parameters(defined by the command syms) which take positive real values, and a list of 19 independent algebraic equations that relate to each of those parameters. For the sake of convenience, lets assume my parameters are can be expressed with set {a_n, where 1<=n<=24 }

What I want to determine is the maximum amount of the parameters {a_n} that can have equal value, such that the set of parameters still satisfy the 19 equations. As a result, I need to be able to set every possible permutation of k parameters equal to each other.

Currently, the method I'm brainstorming is to define a vector that contains the set, such as this:

vec = [a, b, c, d, e, f, g, h, i1, j1, k, l, m, z, o, p, q, r, s, t, u,v,w,x,y];

and then use the nchoosek function on the set vec to choose all possible permutations of some size, say size. Then, I loop through all permutations, and manually define size-1 new equations defining two variables as equal to each other.

Then, I plug in the original 19 equations, as well as the size-1 new equations into a solve function to get my answer.

Is there an easier way to set parameters equal to each other?