MATLAB: Can we convert a vector elements into symbolic variables but all it elements should all act individually as symbolic variabls

MATLABsymbolicsymbolic computationssymbolic conversionSymbolic Math Toolboxsymbolic variable

 k=sym('k',[4,1])
 
k =
 
 k1
 k2
 k3
 k4
 
>> k1
Undefined function or variable 'k1'.
% how to make all elements of k as symbolic variable

Best Answer

syms(sym('k', [4 1]))

However typically you should instead

k = sym('k', [4 1])
k(1)

Related Solutions

MATLAB: Creating a diagonalmatrix with diag and add a value to it

Try this. It shows an example with symbolic variables to show that it creates the correct matrix. You can try it with k as a numeric vector

k = sym('k', [1, 8]);
A = diag(k(2:end-1),1) + diag(k(2:end-1),-1) + diag(k(1:end-1)+k(2:end));

Result

>> A
A =
[ k1 + k2,      k2,       0,       0,       0,       0,       0]
[      k2, k2 + k3,      k3,       0,       0,       0,       0]
[       0,      k3, k3 + k4,      k4,       0,       0,       0]
[       0,       0,      k4, k4 + k5,      k5,       0,       0]
[       0,       0,       0,      k5, k5 + k6,      k6,       0]
[       0,       0,       0,       0,      k6, k6 + k7,      k7]
[       0,       0,       0,       0,       0,      k7, k7 + k8]

MATLAB: How to subs element of strucs in a loop

K = sym('k', n, n)
varnames = fieldnames(sol);
numvars = length(varnames);
solz = struct();
for K = 1 : numvars
  thisvar = varnames{K};
  solz.(thisvar) = subs(sol.(thisvar), z, 1);
end

Best Answer

Related Solutions

MATLAB: Creating a diagonalmatrix with diag and add a value to it

MATLAB: How to subs element of strucs in a loop

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