Defining several maxima in the matrix

Hello!

I have a maximum, he is at the very beginning, how can I do this so that conditionally in the first 100 lines the maxima are not protected?

And the second question is if I have several maxima (intervals of maxima +/- 1 but one at the beginning of the column and the other at the end, how to make it so that only the second is visible?

[Lev Mihailov]

[d,f] = max(matrix,[],1);
if i = 1:length(d)
   f(i)<=100   
   g(i)=f+100
end
% I do not know how to logically tell matlab

[dpb]

Don't understand the question, sorry...show us a (small) dataset that illustrates what you have and what your required result should be (and the logic of how you determined that was the right answer).

If, from the last code snippet you're simply wanting to add to those elements that meet a logical condition, use logical addressing--

ix=(f<=100);     % logical vector; T|F.  T for condition
f(ix)=f(ix)+100; % add a constant to those elements

you can assign those results to another array...

g(ix)=f(ix)+100; % g is size(f)
g=f(ix)+100;     % g is size of sum(ix) -- just the elements that were T

but in the latter assignment, where the elements were in original vector f is lost; there are just those from 1:N where N=sum(ix)

[Lev Mihailov]

I have a matrix, in the first column 2 3 4 5 6 7 8, in the second 2 3 4 5 6 7 8, in the third 5 5 5 5 4 3 2, I need to know the maximum of each column and take away from him 6, but when in the third column this happens 5-6, the matlab swears.

It should be so that in the third column instead of 5-6 (maximum on the first line minus 6) there were 5 no more than 5, but I do not know how to do it

I also need to take into account, for another task, the number of values ​​to the maximum And the maximum at the very beginning

[Lev Mihailov]

[d,g] = max(Wscat,[],1);
for i = 1:length(d)
    
    if g(i)+BB>size(Wscat,1);
        PP=Wscat((g(i)-100:g(i)),i) ;
        P{i}=PP(PP ~= 0);
        
    elseif g(i)-100<0
        PP=Wscat(1:g(i),i) ;
        P{i}=PP(PP ~= 0);
        
    else 
        PP=Wscat((g(i)-100:g(i)),i) ;
        P{i}=PP(PP ~= 0);
        
end

end

Ll=cellfun('prodofsize',P);

 for i = 1:length(d)


if g(i)+Ll(i)>size(Wscat,1);
    nmm=Wscat(g(i):end,i)  ; 
    mn=Wscat((g(i)-50:g(i)),i) ;
    V{i}=mn(mn ~= 0);
    T{i}=nmm(nmm ~= 0);
elseif g(i)-50<0
    mn=Wscat(1:g(i),i) ;
    nmm=Wscat(g(i):g(i)+Ll(i),i)  ;
    V{i}=mn(mn ~= 0);
    T{i}=nmm(nmm ~= 0);
else
    nmm=Wscat(g(i):g(i)+Ll(i),i)  ; 
    mn=Wscat((g(i)-50:g(i)),i) ;
    V{i}=mn(mn ~= 0);
    T{i}=nmm(nmm ~= 0);
    end

      
 end

[Lev Mihailov]

Error Subscript indices must either be real positive integers or logicals.

else 
        PP=Wscat((g(i)-50:g(i)),i) ;
        P{i}=PP(PP ~= 0);
        
        % so g = 1 in the 700 column