How to divide data into different cells?

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Ahmad Kamal Bin Mohd Nor 2019-8-28

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https://ww2.mathworks.cn/matlabcentral/answers/477874-how-to-divide-data-into-different-cells

评论： Jon 2019-8-28

Ok stuck here. Pls gives some help.

dataTrain is a table of all my data. This is a time series dataset. It has more than 20 variables. Variable 1 is the individual no. There are 'n' = 260 individuals. Variable 2 is time. Variable No. 3 is the 'Output' while No. 4 to end are the 'Inputs'

I want to divide all of this data into cells of Xtrain(Inputs) and Ytrain(Output) according to individual no.

This is my code

Xtrain = cell(n,1);
Ytrain = cell(n,1);
i = 1;
j = 1;
k = 1;
for j = 1:n;
while dataTrain{i,1} == j;
L(:,i)= dataTrain{i,4:end};
M(:,i)= dataTrain{i,3};
i = i + 1;
end
Xtrain{j,:} = L(:,k:i-1);
Ytrain{j,:} = M(:,k:i-1);
k = i;
j = j + 1;
end

However when I do this, Xtrain and Ytrain stopped at 259, Matlab gives 'Row index exceeds table dimensions.'

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Ahmad Kamal Bin Mohd Nor 2019-8-28

var.mat

here is the MAT file with the dataTrain table

you can use the code I had given to test

Ahmad Kamal Bin Mohd Nor 2019-8-28

if you run the code, it will take some time.

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Answer 1

Jon 2019-8-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/477874-how-to-divide-data-into-different-cells#answer_389433

编辑：Jon 2019-8-28

在 MATLAB Online 中打开

Your looping logic looks quite complicated, and it is difficult to follow exactly what your intent is here. From your verbal description it sounded like you just want to make two cell arrays one with the input data and the other with the output data.

So is what you are trying to do just as simple as the following or am I not understanding what you are trying to accomplish (I'm assuming you want the individual number and time in both arrays)

Xtrain = horzcat(dataTrain(:,1:2),dataTrain(:,4:end))
Ytrain = dataTrain(:,1:3)

I would also recommend that for this type of data you are much better of either using MATLAB tables or if infact this is actually time series data use a timetable

For more info, on the command line enter

doc timetable

or enter

doc table

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Jon 2019-8-28

编辑：Jon 2019-8-28

在 MATLAB Online 中打开

Oh, so you already have your data in a table.

I would recommend just working with your data in this existing table. It is generally not necessary or desirable to break up a large overall table into individual tables. You can use indexing and grouping variables to collect the subsets of data that you want for particular parts of your analysis.

So for example if at some point in your analysis you wanted what you call the input data and output data for Fleet number 213 as numerical arrays you could just use

xTrain = dataTrain(dataTrain.Fleet==213,[2,4:27])
yTrain = dataTrain(dataTrain.Fleet==213,2:3)

where I have included the Cycle (time) column in each, but omitted the Fleet number (since presumably you would know what that was since that was the subset you selected.

The above could of course be included in some type of loop that did the analysis for each fleet member, in which case, if your loop index was k, you would substitue dataTrain.Fleet == k for dataTrain.Fleet == 213

Does this help? If you are still stuck, please say a little more about what you want to do with the data and what subsets of the data you need to extract.

Ahmad Kamal Bin Mohd Nor 2019-8-28

wow... this works

thanks!!!!

Jon 2019-8-28

Excellent! I've found that working with MATLAB tables has hugely simplified a lot of data analysis that I do.

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How to divide data into different cells?

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