Extract and display result from table MATLAB - matlab

Question

I am trying to extract the lowest value for V from the table produced for each force (F) in order to establish the optimum result, e.g. for F=5000, V=0.06575 is the optimum result.
I want to be able to display this for each instance of F. I'm not quite sure where I am going wrong.
%===========================================
%This Script calculates
%===========================================
%Parameter Values
%F:force (N)
%L1: Length of beam 1 (m)
%L2: Length of beam 2 (m)
%H: Height of beam 1 (m)
%h: Height of beam 2 (m)
%b: Cross section width (m)
%S: Yield strength (Pa)
%N: Factor of safety
%V:Volume of the beam (m^2)
%=========================================
clc %clear command window
clear all %clear all variables previously generated and stored in Matlab
format short g
L1=2;
L2=3;
b=0.05;
S=248;
K=1.42;
results=[];
optimalresults=[];
nd=3.6; %desired factor of safety calculated by group number
for F=5000:100:6000
for h=0.2:0.005:0.3 %loop of h
for H=0.2:0.005:0.3 % loop of H
M1=F*(L1+L2);
M2=F*L2;
I1=b*H^3/12;
I2=b*h^3/12;
Y1=H/2;
Y2=h/2;
Max_stress_1=M1*Y1/I1;
Max_stress_2=K*(M2*Y2/I2);
Max_total_stress=max(Max_stress_1,Max_stress_2);
Max_total_stress=Max_total_stress/1e6;
N=0.577*S/Max_total_stress;
%if N is greater than desired factor of safety then display results
if N >= nd
V=(b*L1*H)+(b*L2*h);
results=[results; F,V,N];sort(F);
end
end
end
results_sorted=sortrows(results,1); %sorts factor of safety from min to max
disp(' F V N');
disp(results_sorted);
optimum=results_sorted(1,:)
end
What do I have to change to display the minimal value of V for each F?

Answer 1

My guess is that you probably want this bit outside of the 3 for loops:
results_sorted=sortrows(results,1); %sorts factor of safety from min to max
disp(' F V N');
disp(results_sorted);
optimum=results_sorted(1,:)
Also, I am not sure what you achieve with sort(F); inside the loop.

Answer 2

I think your code needs two changes before you can get the minimal value of V for each F:
Where you use sortrows, you should sort the table using the second column (V), so that the lowest V gets placed in the top row. results_sorted=sortrows(results,2);
You should sort only the results for the current F, so either you clear the variable "results" for each F iteration results=[]; or you use a new variable. Be sure to check if "results" is not empty before sorting the rows.
The variable "optimum" has now the lowest V for each F iteration.