How can I find the max value from many max values inside the " WHILE LOOP " ?

if we run the code below we will get the maxpower in each round of "for loop" means the for loop starts from -28.64 up to +28.64 which means

20 steps. Now, the maxpower is obtained from each round (20 steps of the for loop). My question is how can I find the maximum value from many maxpower values inside while loop ?

Thanks in advance

Angleoption11 = [-28.6479 -27.5 -18.33 -13.75 -11 -9.16 -7.85 -6.87 -6.11 -5.5 5.5 6.11 6.87 7.85 9.16 11 13.75 18.33 27.5 28.6479];
while true
    previouspower = currentpower;
    for current_index1 = 1:numel(Angleoption11)
        pickangle11 = Angleoption11(current_index1);
        distance = sqrt((x1-x2.').^2 + (y1-y2.').^2)
        currentpower=pt*distance
    end
    [maxpower, index]=max(currentpower);
end

[James Tursa]

It is unclear what this code does or is intended to do. E.g.,

• There is no break out of the forever while loop, so the code will never terminate on its own
• previouspower is never used
• pickangle11 is never used
• The distance calculation doesn't depend on anything in the loop
• pt is not defined anywhere
• x1, x2, y1, y2 are not defined anywhere
• Etc.

It is impossible to advise you how to get your desired result when your code does not appear to be a minimal working example. Or maybe you could use some numeric example inputs and show us what your desired numeric outputs would be.

[omar th]

first thank you for your fast response. Second, actually I just wanted to give simple example to make it easy for understanding. Below the the code that I wanted to find the maxpower. if you run this code you see 20 value in for loop and max function obtain ONE value from this 20 values, again for loop will be excuted 20 values and again max function will obtain one value and so forth.... at the end of the code will be stopped for example when the code is break

there are 5 maxpower values. My question I want to find the max value from these 5 values. I hope to let you get my question

thanks in advance, again

function UAVBSsMobilityBasedOnSINR(NumDrone, v, ro, center)

Numpoint1 = 1;center1=[0 0];center2=[0 0];
Numpoint2 = 1;ro1=1000;ro2=1000; vs1=0;vs2=0;v1=15/3.6;v2=15/3.6;


theta_point1=2*pi*(rand(Numpoint1,1)); % distributed random number of random point
g1 = 0.5 * ro1 + 0.5 * ro1 * rand(Numpoint1,1); % let the point deployed away from the center of circle network layout
Pospoint1_x=center1(1)+g1.*cos(theta_point1); % Initial positions
Pospoint1_y=center1(2)+g1.*sin(theta_point1);
Pospoint1 = [Pospoint1_x ,Pospoint1_y];

theta_point2=2*pi*(rand(Numpoint2,1)); % distributed random number of random point
g2 = 0.5 * ro2 + 0.5 * ro2 * rand(Numpoint2,1); % let the random point deployed away from the center of circle network layout
Pospoint_x=center2(1)+g2.*cos(theta_point2); % Initial positions
Pospoint2_y=center2(2)+g2.*sin(theta_point2);
Pospoint2 = [Pospoint_x ,Pospoint2_y];

hfig = figure('Color', 'w');
hax = axes('Parent', hfig);
hpoint(1) = plot(Pospoint1(1,1),Pospoint1(1,2),'Parent', hax,'Marker', '*','Color', 'k','LineStyle', 'none','MarkerSize', 12);
hold(hax, 'on')
axis(hax, 'equal')
hpoint(2) = plot(Pospoint2(1,1),Pospoint2(1,2),'Parent', hax,'Marker', '*','Color', 'r','LineStyle', 'none','MarkerSize', 12);
hold(hax, 'on')
axis(hax, 'equal')
ro=1000;center=[0 0];

t1 = linspace(0, 2*pi, 100);
plot(ro * cos(t1) + center(1), ro * sin(t1) + center(2));
      
Angleoption11 = [-28.6479 -27.5 -18.33 -13.75 -11 -9.16 -7.85 -6.87 -6.11 -5.5 5.5 6.11 6.87 7.85 9.16 11 13.75 18.33 27.5 28.6479];
Angleoption22 = [-28.6479 -27.5 -18.33 -13.75 -11 -9.16 -7.85 -6.87 -6.11 -5.5 5.5 6.11 6.87 7.85 9.16 11 13.75 18.33 27.5 28.6479];
alpha =2;pt=10;
currentpower1=zeros(1,1);
currentpower2=zeros(1,1);


while true
    
    
    previouspower1 = currentpower1;
    previouspower2 = currentpower2;

    for current_index1 = 1:numel(Angleoption11)
    pickangle11 = Angleoption11(current_index1);
        dist_d1_d2 = sqrt((Pospoint_x-Pospoint1_x.').^2 + (Pospoint2_y-Pospoint1_y.').^2)

        previouspower1 = currentpower1;
    currentpower1 = pt* (dist_d1_d2)^-alpha;

        [Pospoint1, pickangle11] = moveit1(Pospoint1, pickangle11, v1, ro1, center1);
        fprintf(' 1 Change its Strategy ')
        set(hpoint(1), 'XData', Pospoint1(1,1), 'YData', Pospoint1(1,2))
        drawnow
        pause(1)
    
    end
    
    for current_index2 = 1:numel(Angleoption22)
    pickangle22 = Angleoption22(current_index2);
    dist_d1_d2 = sqrt((Pospoint_x-Pospoint1_x.').^2 + (Pospoint2_y-Pospoint1_y.').^2)

    currentpower2 = pt* (dist_d1_d2)^-alpha
            previouspower2 = currentpower2;

         [Pospoint2, pickangle22] = moveit1(Pospoint2, pickangle22, v1, ro1, center1);
        fprintf(' 2 Change its Strategy ')
        set(hpoint(2), 'XData', Pospoint2(1,1), 'YData', Pospoint2(1,2))
        drawnow
        pause(1)
        

    
    end
        [maxpower1, ~] = max(currentpower1);
    [maxpower2, ~] = max(currentpower2);
    
    condition1 = currentpower1 > maxpower1;
    if condition1
        [Pospoint1,pickangle11] = stop1(Pospoint1,pickangle11, vs1,ro1, center1);
        fprintf(' P 1 ')
    
    end
    
    condition2 = currentpower2 > maxpower2;
    if condition2 
            [Pospoint1,pickangle22] = stop1(Pospoint1,pickangle22, vs1,ro1, center1);
        fprintf(' P 2 ')
    end
    
    cond11 = ((currentpower1-previouspower1)<0.1) && ((currentpower1-previouspower2)<0.1);
    condition = condition1 & condition2 & cond11;
    if condition
        break
    end
    
end

end

[dpb]

Save the max you find each iteration in another array -- when the outer iteration is complete, then use max on that array.

Or, you can compare the new maximum to the previous each time and save the greater on each pass -- to do this you also must have a GlobalMax value that starts of first iteration holding the maximum; for subsequent does the comparison first.

[omar th]

" Or, you can compare the new maximum to the previous each time and save the greater on each pass -- to do this you also must have a GlobalMax value that starts of first iteration holding the maximum; for subsequent does the comparison first."

thank you so much for your reply, actually this is what I want GlobalMax, so would you explain it more ?

Answer 1

[David Hill]

GlobalMax=-9999;
while true
    for 
        %calculations
    end
    if maxpower>GlobalMax
        GlobalMax=maxpower;
    end
end

[omar th]

first thank you for your response. If the global max generated during the excution which means during running the code at some point the global max power will be reached so I want the code stop at this point when reached that Global max

[David Hill]

while true
    for 
        %calculations
    end
    if maxpower>GlobalMax
        GlobalMax=maxpower;
    else
        break;%break when the maxpower stops increasing?
    end
end

[omar th]

Let's say by using for loop 20 values will be calculated again for loop will produce 20 values and so on. Here I want to compare the the max value from the the first 20 value and max value from the second 20 value and so on. let say for loop will work for 5 times. Now I have 5 max values how can I choose one max value from these 5 max values and consider the selected max value as Global max