Need to access the structure values in numerical form and store it in an array each time the loop runs

Hi all,

I am trying to access the structure values from the followign code and want to store it in the form of an array each time the loop runs. I have tried using stryct2cell and cell2mat but they give certain errors. I need the numerical values of x and y by solving the two equations.

Since I am very new to MATLAB programming, I do not much of an idea what does the structure hold in this case and how can we access the numerical values. Kindly help me.

for i = 1:127
    syms x y
    sol = solve([(1-x)*(1-exp(-y))+ A32T22_array(i)*(1-x)*exp(-y)+ T2T12_array(i) + R2_array(i) == 1, x + R1_array(i)*(1-x)*exp(-y) == R2_array(i), x>0, y>0], [x,y]);
    R12T12_array(i) = solxy(1,1);
    ad_array(i) = solxy(2,1);
end

Answer 1

[darova]

Make some modifications

An example

syms x y
sol = solve([5*x-y y-1])

sol = struct with fields:
    x: [1×1 sym]
    y: [1×1 sym]

[RAVI SINGH]

Hi @darova

Thank you for the suggestions.

I tried as you suggested. However, there is an error for that case:

" Unable to perform assignment because the left and right sides have a different number of elements.

Error in Ge_absorption_coefficient (line 70)

R12T12_array(i) = sol.x; "

What are fields and how are they defined. Is it possible to extract the value of them?

I had extracted for one sample without using the loop and I did get it in fractional terms where I had to convert it into double integer form. However, same did not work for a loop.

[darova]

Looks like you have several roots

just type in the other line

sol.x

And see how many roots you have. Maybe you need something lke this:

R12T12_array = nan(127,5);              % assuming max number of roots: 5
for i = 1:127
    % code
    n = numel(sol.x);
    R12T12_array(i,1:n) = sol.x;        % write roots
end

[RAVI SINGH]

@darova: thank you very much for your help.

Though there was a small mistake in one of the equations, however, what you suggested really helped. I also checked it for a different set of simpler equations to test it. Though I need to learn it much better, I understand a bit of it now, thanks to you.