How to solve for subscripted assignment mismatch error in for loop?

I am trying to solve an equation for a variable given another variable values and a parameter. Gamma is the given variable and I will solve for K. I tried using for loop, but I cannot get the solution due to an error: Subscripted assignment dimension mismatch.

c=5;
rho=0.06;
mu=0;
psi=1; 
i=1;
sigma = 0.1;
gamma = 0:0.01:0.2;
beta_1 = 1/2 - mu/sigma^2 + sqrt((mu/sigma^2 - 1/2)^2 + 2*rho/sigma^2);
solK = zeros(1,21);

for n = 0:20

      K = sym('K');

      eqn = (beta_1-2)*psi*K/(c*rho) - (rho + beta_1*0.01*n*K)/(rho + 0.01*n*K)^2 == i/c;

      solK(1,n+1) = solve(eqn, K);

end

[Geoff Hayes]

Anuudari - please copy and paste the full error message so that we know exactly at which line (in your above code) the error is being thrown. The problem is most likely with

 solK(1,n+1) = solve(eqn, K);

and this could be because the result from

 solve(eqn, K)

is a symbolic array and not a double/scalar. Try stepping through the code (using the debugger) to see what is happening at this line.

[Anuudari Burenbat]

Thanks, Geoff,

Yep the error is here: Subscripted assignment dimension mismatch.

Error in DRi (line 14)

solK(1,n+1) = solve(eqn, K);

Stalin, when I do just that it gets another error: In an assignment A(I) = B, the number of elements in B and I must be the same.

[Geoff Hayes]

Anuudari - what does solve(eqn, K) return? Put a breakpoint at this line and then run your code. When the debugger pauses here, run

 solve(eqn, K)

in the Command Window. Look at the result and its type by using class. When you have done so, does it make sense to assign the above to

 solK(1,n+1)

[Anuudari Burenbat]

I worked it out thanks Geoff!

Answer 1

[Stalin Samuel]

i am not sure but if you do like below error removed

solK(n+1) =solve(eqn, K);