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

Question

omar th 2022-7-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1768275-how-can-i-find-the-max-value-from-many-max-values-inside-the-while-loop

评论： omar th 2022-7-26

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

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omar th 2022-7-26

在 MATLAB Online 中打开

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 2022-7-26

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 2022-7-26

" 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 ?

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Answer 1

David Hill 2022-7-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1768275-how-can-i-find-the-max-value-from-many-max-values-inside-the-while-loop#answer_1015490

在 MATLAB Online 中打开

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

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David Hill 2022-7-26

在 MATLAB Online 中打开

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

omar th 2022-7-26

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

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