MATLAB: How to stop for loop from overwriting

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I am trying to solve for Z multiple times due to a change in P. I want to save every result rather than my script cotinuously overwriting the result. How do i do this?
numData = xlsread('Measuring Waves with Pressure Transducers Sheet');
%Pressure From Excel
P = numData(:,13);
Ruskin = numData(:,14);
Burst = numData(:,1);
%Variables from excel calcs
W = 0.392699;
K = 13.8125;
q = 10.13;
d = 9.5;
g = 9.81;
x = 1025;
%Use H=F(Min:Max) for values
for ii = 1:length(P)
  
    syms z
    
eqn = (P(ii).*10.^4./x)-(q.*10.^4./x)==((W.^2.*cosh(K.*(d+z)))/(sinh(K.*d)))-g.*z;
   Sx = solve(eqn,z)
end

Best Answer

 Sx = cell(numel(P), 1); % before loop 
 Sx{ii} = ... inside loop
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