How to group a matrix based on one column?
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Hi,
I have a 64600x59 matrix data. I need unique values and also non-unique values grouped. Usually i use unique() function and then check if my rows matches with unique value rows, then i group by this using for loop. But this time my data is very big and it takes too much time.
I am curious about if there is any shortcut way or a function in matlab for me to group every same value in a different cell or table. This way i will be seeing non-unique values as grouped.
Do you have any ideas or suggestions?
Thank you
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Peter Perkins
2023-6-5
There are any number of ways to do grouped calculations, includng groupsummary/transform/filter/counts, varfun/rowfun, and (as Stephen123 says) findgroups/splitapply.
But first you need to show exactly what you have and exactly what you want.
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Matt J
2023-5-9
编辑:Matt J
2023-5-9
Usually i use unique() function and then check if my rows matches with unique value rows, then i group by this using for loop.
If using unique(), the 3rd output argument gives the group label. There is no need for a for-loop.
[values, ~, groupLabel]=unique(data);
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