how to add specific columns in table (in verse)

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);

Answer 1

[Jiri Hajek]

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);

[Daniel Cisek]

It could be something like this:

sum(T1{:,find(~contains(T1.Properties.VariableNames,"Ligota"))},2)

Or it's better solution?

[Jiri Hajek]

Nice. It must suit you, doesn't matter how many other ways there are to get to the same result.

[Stephen23]

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]

Thanks Stephen23. I always try to compress code as much as possible. Maybe it's time to think about how to write it transparently.