plot parametric relationship between sigma max and tau max and highlighting the points which apply to the admissible values

As per my understanding, you want to create a plot that highlights the points which are less than or equal to the admissible values for both “sigma” and “tau”.

Consider the code below:

figure; 
tau_max = randi([10 50],1,10); 
sigma_max = randi([1 5],1,10); 
tau_adm = 40; 
sigma_adm = 4; 
plot(tau_max,sigma_max); 
for i=1:10 
    hold on 
    if(tau_max(i)<= tau_adm && sigma_max(i)<= sigma_adm) 
        plot(tau_max(i),sigma_max(i),"r*"); 
    end 
    hold off 
end 
title('Parametric relationship between Sigma max (d) and Tau max (d)') 
xlabel('Tau max (d)') 
ylabel('Sigma max (d)') 

The arrays "tau_max" and "sigma_max" are assigned with some random values, with the help of "randi" function. "tau_adm" & "sigma_adm" are assigned with the values 40 & 4 respectively.

To highlight the points which are less than or equal to the admissible values ("tau_adm" & "sigma_adm"), a combination of "for" loop and "if" statement is used.

You can refer to the documentation of "for" loop and "if" statement, for more info:

for loop to repeat specified number of times - MATLAB for - MathWorks India

Execute statements if condition is true - MATLAB if elseif else - MathWorks India

Hope this answer helps you.

Thanks,

Bhanu Prakash.