MATLAB: For loop – what about the min and max values

for loopmaximumminimum

For loop – what about my min and max values? I'm using a for loop and although my plot is right, I'm only seeing my maximum x-axis value in the Workspace Max column. Is there a way to have the Min and Max columns actually correct?
Many thanks
iter=1;
for f=50:1000
rho_a=1.2041; 
sigma=11000; 
phi=0.99; 
alpha=1; 
c=343.26; 
i=sqrt(-1); 
L=0.1; 
a=0.03; 
k_a=(2*pi*f)/c; 
k_2=((2*pi*f)/c)*sqrt(alpha-((i*sigma*phi)/(2*pi*f*rho_a))); 
z_c_2=((rho_a*c)/phi)*sqrt(alpha-((i*sigma*phi)/(2*pi*f*rho_a))); 
z_1=(z_c_2*cot(k_2*L)*(cos(k_a*a)+(i/(rho_a*c))*sin(k_a*a)))/(i*cos(k_a*a)-(1/(rho_a*c))*sin(k_a*a));
R=((z_1/(rho_a*c))-1)/(1+(z_1/(rho_a*c)));
Rrec(iter)=R;
AbsCoef=1-(real(R))^2;
AbsCoefrec(iter)=AbsCoef;
z_1rec(iter)=z_1;
iter=iter+1;
end
plot(50:1000,AbsCoefrec)

Best Answer

Your x axis is the loop variable f, which can only take on one value at a time, thus the min and max are the same. To do what you want, you would have to modify your code something like this
freq = 50:1000;
AbsCoefrec = zeros(size(freq));  % preallocate!
for f = freq
% ---insert code here---
end
plot(freq,AbsCoefrec)
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