How to Extract 2048 values containing the maximum value?

Question

Elham 2022-6-28

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1749970-how-to-extract-2048-values-containing-the-maximum-value

回答： Voss 2022-6-28

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?

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Answer 1

Les Beckham 2022-6-28

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1749970-how-to-extract-2048-values-containing-the-maximum-value#answer_995830

编辑：Les Beckham 2022-6-28

在 MATLAB Online 中打开

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