How to save the Data in different array using Value in 2nd column

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Hello, I hope you are doing well. I have the dataset which have five columns
My second columns consists the values 15,37,25 etc
I want to to save data in different array for example if i have value of 15 in 2nd column, i want to save the values of remaining four columns which correspond to 15 in different array.
Similar method for other values too.
How can i do that in MATLAB
  3 Comments
Arif Hoq
Arif Hoq on 24 Jan 2023
do you want only for 15,37,25 ?? or do you need all the unique values of column 2?
Jan
Jan on 24 Jan 2023
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Answers (1)

Stephen23
Stephen23 on 24 Jan 2023
Edited: Stephen23 on 24 Jan 2023
Clearly creating lots of separate variables in the workspace would be a very bad approach:
So instead we will use the more efficient approach of storing the split data in one cell array:
S = load('DatasetValues.mat')
S = struct with fields:
DatasetValues: [49349×5 double]
M = S.DatasetValues
M = 49349×5
1.0e+06 * 0.2658 0.0000 0.0000 0.0001 0.0000 0.2920 0.0000 0.0000 0.0001 0.0000 0.2932 0.0000 0.0000 0.0001 0.0000 0.3079 0.0000 0.0000 0.0001 0.0000 0.3119 0.0000 0.0000 0.0001 0.0000 0.3147 0.0000 0.0000 0.0001 0.0000 0.3191 0.0000 0.0000 0.0001 0.0000 0.3249 0.0000 0.0000 0.0001 0.0000 0.3577 0.0000 0.0000 0.0001 0.0000 0.3590 0.0000 0.0000 0.0001 0.0000
[U,~,X] = unique(M(:,2));
F = @(n) M(X==n,:);
C = arrayfun(F,U, 'uni',0)
C = 29×1 cell array
{ 2967×5 double } { 6×5 double } { 3122×5 double } { 3×5 double } { 2×5 double } {16076×5 double } {[2.6727e+06 19 6.9581e-04 1.1950 1]} {[6.3468e+05 26 3.0502e-04 1.2750 2]} { 280×5 double } { 170×5 double } {[2.7925e+06 74 2.6536e-04 2.5650 3]} { 1982×5 double } { 4×5 double } { 998×5 double } { 0×5 double } { 0×5 double }
Each cell of C collects the value given in the corresponding location of U.
Although splitting data up is popular with beginners, in general data should be kept together as much as possible. The split-apply-combine workflow might be useful for you, and is supported by a number of functions:

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