Vectorization or Looping?

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Dave O
Dave O 2022 年 11 月 27 日
コメント済み: Dave O 2022 年 11 月 27 日
I'm trying to accomplish a task through vectorization rather than reverting to my old habit of looping. I have a table, T, imported from a text file. The table is comprised of a list of items with a variable number of subtotals associated with each item. Is it possible to return the sum of the subtotals for each item without looping?
For example, with T below:
Var1 Var2
Item 1 NaN
Subtotal 1 1.4
Subtotal 2 0.7
Subtotal 3 5.4
Item2 NaN
Subtotal 1 1.9
Item 3 NaN
Subtotal 1 2.4
Subtotal 2 3.6
Desired output:
v1 v2
Item 1 7.5
Item 2 1.9
Item 3 6.0
v1 = find(contains(T.Var1,'Item'));
v2 = ?
Thanks in advance to anyone who can help!
  2 件のコメント
Dave O
Dave O 2022 年 11 月 27 日
Thank-you for directing me towards the group summary. This is exactly the functionality I needed.



Image Analyst
Image Analyst 2022 年 11 月 27 日
You forgot to attach your table. No one is going to type all that in when you could just give it to us in a .mat or text file.
In the meantime, check out findgroups, groupsummary, grpstats, and splitapply
If you have any more questions, then attach your data and code to read it in with the paperclip icon after you read this:
  1 件のコメント
Dave O
Dave O 2022 年 11 月 27 日
Thank-you for directing me to these functions. These are what I needed to accomplish my task.


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