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How to convert or extract symbolic matrix expressions to string?

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Lee Jong Hyun
Lee Jong Hyun 2023-8-1
回答： Anjaneyulu Bairi 2023-8-28
For symbolic matrix expression of symbolic matrix 'D', I want to convert or extract any variable type with char and str.
How to convert or extract symbolic matrix expressions to string?
Thank you.
N = 100;
A = symmatrix('A',[N, N]);
B = symmatrix('B',[N, N]);
C = symmatrix('C',[N, N]);
D = A*B*C;
  2 个评论
Dyuman Joshi
Dyuman Joshi 2023-8-1
Ran in:
It might be difficult with symmatrix or maybe not even possible.
This might be a workaround -
N = 3;
syms A B C [N N]
D = A*B*C
D = 
E = string(D)
E = 3×3 string array
"C1_1*(A1_1*B1_1 + A1_2*B2_1 + A1_3*B3_1) + C2_1*(A1_1*B1_2 …" "C1_2*(A1_1*B1_1 + A1_2*B2_1 + A1_3*B3_1) + C2_2*(A1_1*B1_2 …" "C1_3*(A1_1*B1_1 + A1_2*B2_1 + A1_3*B3_1) + C2_3*(A1_1*B1_2 …" "C1_1*(A2_1*B1_1 + A2_2*B2_1 + A2_3*B3_1) + C2_1*(A2_1*B1_2 …" "C1_2*(A2_1*B1_1 + A2_2*B2_1 + A2_3*B3_1) + C2_2*(A2_1*B1_2 …" "C1_3*(A2_1*B1_1 + A2_2*B2_1 + A2_3*B3_1) + C2_3*(A2_1*B1_2 …" "C1_1*(A3_1*B1_1 + A3_2*B2_1 + A3_3*B3_1) + C2_1*(A3_1*B1_2 …" "C1_2*(A3_1*B1_1 + A3_2*B2_1 + A3_3*B3_1) + C2_2*(A3_1*B1_2 …" "C1_3*(A3_1*B1_1 + A3_2*B2_1 + A3_3*B3_1) + C2_3*(A3_1*B1_2 …"
E(1)
ans = "C1_1*(A1_1*B1_1 + A1_2*B2_1 + A1_3*B3_1) + C2_1*(A1_1*B1_2 + A1_2*B2_2 + A1_3*B3_2) + C3_1*(A1_1*B1_3 + A1_2*B2_3 + A1_3*B3_3)"

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采纳的回答

Anjaneyulu Bairi
Anjaneyulu Bairi 2023-8-28
I understand that you are trying to convert symbolic matrix expression into string.
You can use “string” function to convert it.
To avoid error while converting to string, please use “syms” like below instead of “symmatrix” to create symbolic matrix.
N=100
S = sym('S', [N N])
S_str=string(S)
“S_str” is the string form of “S” symbolic expression.
Hope it helps!

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