清空筛选条件
清空筛选条件

Substitute multiple elements of multiple arrays with vectors

5 次查看（过去 30 天）
RODRIGO CRESPO MIGUEL
评论： Dyuman Joshi 2023-4-3
Hello. From solving the following matrix equation (with matrices of arbitrary size NxN) I obtain the solution to my problem functions cepsepssym:
syms cepsepssym [nvars nvars]
syms cBeps [nvars nvars]
syms cepsB [nvars nvars]
syms Bautocorr
equations = -cepsepssym*transpose(matrizGamma)-matrizGamma*cepsepssym+cepsB+cBeps+diag(vecsigmas)*Bautocorr==0;
sol=solve(equations,cepsepssym);
solvec=reshape(transpose(sol),1,[]);
But now I want to substitute each of the other variables (i.e., each element of the matrixes cBeps and cepsB, and Bautocorr) by a vector (given by known time dependent functions). Is there an easy way to do that?
Thank you very much in advance

请先登录，再回答此问题。

回答（1 个）

Varun
Varun 2023-3-24
Ran in:
Hello!
You can use the “subs” function in MATLAB to substitute each of the variables by a vector. For example, for a simple matrix product equation, we have
syms X Y [2 2] matrix
sM = X*Y
sM = 
S = subs(sM,{X,Y},{[0 sqrt(sym(2)); sqrt(sym(2)) 0], [1 -1; -2 1]})
S = 
Ssym = symmatrix2sym(S)
Ssym = 
You may refer to this documentation for more information:
“subs”: https://www.mathworks.com/help/symbolic/subs.html#mw_12726007-2cf5-4537-a248-7230abd1174f
  2 个评论
RODRIGO CRESPO MIGUEL
RODRIGO CRESPO MIGUEL 2023-4-3
The problem is that I want to substitute entire time dependant vectors in each element of the matrix.
For example, let A be a 2x2 matrix. I want each of those four elements substituted by a different (let's say 1:100) vector. Can I do that with subs?
Dyuman Joshi
Dyuman Joshi 2023-4-3
Ran in:
You can do that, but note that you won't obtain every unique combination in output, just one-to-one combination.
syms x y z q
A = [sin(x) cos(y); exp(z) q]
A = 
subs(A,{x,y,z,q},{1:10,1:10,1:10,1:10})
ans = 

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Number Theory 的更多信息

标签

产品


版本

R2022b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by