How to Extract 2048 values containing the maximum value?

Hi,

I have a file with total of 49,152 x1 values. I want to split them into ranges of 2048 values and extract the 2048 values that has the maximum number so I can plot the largest 2048 values. This is the code I have right now:

plot(A(1:2048))
hold on
for i = 1:(numel(A)/2048)-1
    data_segment = A(1+2048*i: 2048*(i+1));
    z{i}=sum(data_segment);
    z=z';
    plot(data_segment)
end
hold off
xlim([1,2048])
%%ivMax=index of max
[Vmax,ivMax]=max(A)
L=data_segment(ivMax/2048)

Vmax gives me the maximum value and ivMax tells me the index of where to find that value. I set L to find which set of 2048 values to find the max and got ~21. How can I extract the 21st 2048 values? Is there any easier way to do this?

Answer 1

[Les Beckham]

Note that this plots the group that contains the maximum datapoint in all of the data. It does not "plot the largest 2048 values". It is difficult to tell from your question if that is what you really want or not. Or maybe, in the context of your data, it is the same thing (without access to your data it is impossible to tell).

A = rand(49152,1) * 100; % sample data
[Amax, imax] = max(A)

Amax = 99.9989

imax = 31210

groupsize = 2048;
start_index = floor(imax/groupsize) * groupsize

start_index = 30720

plot(A(start_index:(start_index + groupsize - 1)));
grid on
hold on
plot(imax - start_index, A(imax), 'r*'); % highlight the max datapoint

[Elham]

Yes I want to plot only the largest 2048 values. Here are the numbers.

Answer 2

[Voss]

"I want to plot only the largest 2048 values"

A = readmatrix('Data2048.txt');
A = sort(A,'descend');
plot(A(1:2048))