how to calculate the maximum of a probability array

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ELISABETTA BILLOTTA ，2023-3-11

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https://ww2.mathworks.cn/matlabcentral/answers/1926775-how-to-calculate-the-maximum-of-a-probability-array

回答： Voss ，2023-3-13

采纳的回答： Voss

i have such a script where PP_all is a 100651x1 matrix and it derives from this formula

PP_all=1-((1-P_1_4).*(1-P_1_6).*(1-P_1_9).*(1-P_2_2).*(1-P_6).*(1-P_7).*(1-P_8).*(1-P_9 ).*(1-P_10));

at each point of the grid, therefore, the product of these values is displayed.

Now instead, in each point of the grid, I have to visualize the maximum value among all these probabilities that created me PP_all. It is as if they were a series of grids superimposed on each other and in the end, at each point, I only display the maximum value of all and create a new grid.

So I need to obtain another 100651x1 matrix (useful for visualizing the final map) where each point of the grid represents the maximum value among all the probabilities P_1_4, P_1_6,P_2_2...P_10.

Can anyone help me?

longrd=0:0.1:40;                 
latgrd=30:0.1:55;
limlon=[min(longrd),max(longrd)];
limlat=[min(latgrd),max(latgrd)];
ic=0; 
for i=1:length(longrd)         
    for j=1:length(latgrd)
        ic=ic+1;
        lonlatgrd(ic,1)=longrd(i);
        lonlatgrd(ic,2)=latgrd(j);
    end
end
figure()
for i=1:length(longrd)
    for j=1:length(latgrd)
        XX(i,j)=longrd(i);
        YY(i,j)=latgrd(j);
        isel1=find(lonlatgrd(:,1)==longrd(i));
        isel2=find(lonlatgrd(isel1,2)==latgrd(j));
        isel=isel1(isel2);
        ZZ(i,j)=PP_all(isel));
    end
end
contourf(XX,YY,ZZ,500,'linecolor','none'); 
colormap jet
hold on
load coastlines.mat;
xlim([min(longrd), max(longrd)]);
ylim([min(latgrd), max(latgrd)]);
colorbar;
pbaspect([1 1 1]);

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ELISABETTA BILLOTTA 2023-3-13

PP_all is not a function but a .mat file that derives from

PP_all=1-((1-P_1_2).*(1-P_1_6).*(1-P_1_9).*(1-P_2_2).*(1-P_6).*(1-P_7).*(1- P_8).*(1-P_9 ).*(1-P_10)).

I am attaching it but I don't have to change a function: it is as if I had to superimpose the grids P_1_4, P_1_6,P_1_9...P_10 and then, once superimposed, choose what is the maximum illness for each point of the grid. Then recreate a 100651x1 matrix consisting of all the maximum values.

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Answer 1

Voss 2023-3-13

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https://ww2.mathworks.cn/matlabcentral/answers/1926775-how-to-calculate-the-maximum-of-a-probability-array#answer_1192100

PP_temp = [P_1_2, P_1_6, P_1_9, P_2_2, P_6, P_7, P_8, P_9, P_10];
PP_max = max(PP_temp,[],2);

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