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how to add specific columns in table (in verse)

3 vues (au cours des 30 derniers jours)
Daniel Cisek
Daniel Cisek le 7 Déc 2022
Modifié(e) : Stephen23 le 7 Déc 2022
I have a table T1 in cell that looks like this (values are double):
T1 =
Ligota1 Ligota2 Orzesze1 Orzesze2 Tychy1 Tychy2
_______ _______ ________ ________ _________ _________
1 2 3 4 5 6
7 8 9 1 2 3
4 5 6 7 8 9
0 1 2 3 4 5
6 7 8 9 0 10
How to add table rows omitting specific columns e.g. names begining with 'Ligota'. I tried to do it with varfun and rowfun functions with no luck. I was able to sum only the rows of all columns:
sum(T1{:,:},2);

Réponse acceptée

Jiri Hajek
Jiri Hajek le 7 Déc 2022
Hi,
you've righly spotted the subtle difference parentheses vs curly braces ("Curly braces, {}, returns an array concatenated from the contents of selected rows and variables.", see here). So it is sufficient to tell the summation operator, which columns to sum (let's say 2nd and 4th):
sum(T1{:,[2,4]},2);
  4 commentaires
Stephen23
Stephen23 le 7 Déc 2022
Modifié(e) : Stephen23 le 7 Déc 2022
Although code golf is popular, for clarity and ease of debugging you could use two lines and logical indexing:
X = contains(T1.Properties.VariableNames,"Ligota");
S = sum(T1{:,~X,2)
Daniel Cisek
Daniel Cisek le 7 Déc 2022
Thanks Stephen23. I always try to compress code as much as possible. Maybe it's time to think about how to write it transparently.

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