is there a way for a creation of variables for machine learning inside a loop from a dataset of waves

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Ri go 2024-11-28

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https://ww2.mathworks.cn/matlabcentral/answers/2169533-is-there-a-way-for-a-creation-of-variables-for-machine-learning-inside-a-loop-from-a-dataset-of-wave

编辑： Stephen23 2024-12-8

i have this dataset of wavelengths, problem is they are flipped and as such whenever i load the data i run a secondary part to rotate and flip, though so far i only have a way to read it and not really make use of it inside an ai machine learning thing

clc; clear; close all;
load('-mat','sub-036_task-eyesclosed_eeg.set','data','group','subject')
data_plot=flip(rot90(data,1));
N=width(data_plot);
B=height(data_plot);
figure 
%----------------------- all of this is just for plotting and seeing it in stackedplot
T = array2table(data_plot, 'VariableNames',"CH: "+(1:N));
s = stackedplot(T);
s.AxesProperties(1);
ax = findobj(s.NodeChildren, 'Type','Axes');
set(ax, 'YTick', []);
%--------------------------
xlim([-500 B+500])
grid on
set (zoom(gcf), 'Motion', 'horizontal', 'Enable', 'on');
%--------------------------

i was wondering if there is a way to make like a for loop so in each loop i get data_1 then data_2 data_3 etc etc etc or how could i use a machine learning or signal labeler app or ai or artificial neural network and deal with the issue that i need to rotateflip the data?

the database is from https://openneuro.org/datasets/ds004504/versions/1.0.7

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Stephen23 2024-12-8

编辑：Stephen23 2024-12-8

在 MATLAB Online 中打开

"i was wondering if there is a way to make like a for loop so in each loop i get data_1 then data_2 data_3 etc etc etc "

The most important change is to always LOAD into an output variable:

S = load(..);

which you can then trivially loop over the fieldnames:

F = fieldnames(S);
for k = 1:numel(F)
    A = S.(F{k});
    .. do whatever with A
end

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Walter Roberson 2024-12-7

在 MATLAB Online 中打开

x = [1 2 3 4];
y = [100 200 300 400];
data = [x; y];
data
data = 2×4
     1     2     3     4
   100   200   300   400
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
flip(data)
ans = 2×4
   100   200   300   400
     1     2     3     4
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
data.'
ans = 4×2
     1   100
     2   200
     3   300
     4   400
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
flip(data.')
ans = 4×2
     4   400
     3   300
     2   200
     1   100
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
rot90(data,1)
ans = 4×2
     4   400
     3   300
     2   200
     1   100
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
flip(rot90(data,1))
ans = 4×2
     1   100
     2   200
     3   300
     4   400
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>

so data.' gives the same result as flip(rot90(data,1)).

Stephen23 2024-12-8

在 MATLAB Online 中打开

Note that LOAD accepts a regular expression directly:

data = load('sub-036_task-eyesclosed_eeg.set', '-regexp','^data_\d+$');

https://www.mathworks.com/help/matlab/ref/load.html#btm0etn-1-variables

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is there a way for a creation of variables for machine learning inside a loop from a dataset of waves

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