Invalid Array Indexing when trying to plot the function

% Empirical Constants
a = 0.0513
n = 0.4176
% Density
p = 0.9
% Initial Port Diameter
d_i = 1
% Initial raidus    
r = 0.5
% Optimal 0/F Ratio
R = 4
% Mass Flow Rate
O = 20
% Burn Time
t = 5


%% Optimal Length versus Optimal O/F Ratio

Optimized_Length = ((O^(1-n))./(4^n*a*x*pi^(1-n)*p))*(d_i^(2*n+1)+2*a(2*n+1)(4*O./pi)^(n)*t)^((2*n-1)./(2*n+1))

Invalid array indexing.

Error in connector.internal.fevalMatlab

Error in connector.internal.fevalJSON

Optimal_OF_Ratio = 1:0.01:10; %Range of the O/F rato we want to know the length of
plot(x,Optimized_Length,'Markersize',2','Color',[0 0.5 0])
xlabel('Optimal O/F Ratio','FontSize',10)
ylabel('Optimal Length','FontSize',10)
set(gca,'xtick', 1:0.5:10)
set(gca,'ytick', 1:2:100)
title('Time Averaged Relationship between Optimal Length','and Optimal O/F Ratio',FontSize=15)

For some reason, I can't seem to plot because of the problem and I don't know why this is occuring. Please help! Thank you.

Answer 1

[Dyuman Joshi]

You forgot operation signs in a few places

((O^(1-n))./(4^n*a*x*pi^(1-n)*p))*(d_i^(2*n+1)+2*a(2*n+1)(4*O./pi)^(n)*t)^((2*n-1)./(2*n+1))
%                                                 ^here  ^here

I suggest you check the formula again, carefully.