using the table format, how to filter on words

Question

Erik Sund 2015-2-12

回答： ag 2024-11-13，18:24

My table looks like this:

Place1 Place2 Place3 ...

A A C

B A A

C C B

C C A

A C A

I want to remove all rows not containing say 'B' and ending up with

Place1 Place2 Place3

B A A

C C B

strcmp(table.Place1,{'B'}) % works in one column

strcmp(table(:,{'Place1','Place2','Place3'}),{'B'}) % returns 0

Answer 1

ag 2024-11-13，18:24

Hi Erik,

To filter the rows containing 'B', you can use logical indexing as described in the below steps:

Use "ismember" function to check each element of the array to see if it matches 'B'.
Use "any" function to check if there is at least one true value in each row of the logical array produced by ismember. This operation should be performed across the second dimension (i.e., columns), meaning it checks each row for any occurrence of true.

The below code snippet illustrates the above approach:

axis = 2 % coloumns
rowsWithB = any(ismember(table{:,:}, 'B'), axis);

For more details, please refer to the following MathWorks documentation:

Hope this helps!