How to use "contains" statement to detect a string without ambiguity?

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Giuseppe
Giuseppe on 22 Jun 2022
Commented: Steven Lord on 22 Jun 2022
Hi to everyone,
I have a table with some data (attached file table.mat ). In the second column named " Sol_inters " I have three types of data (strings):
A
B
A & B
I want to filter the original table in order to create three filtered tables (tab_A, tab_B, tab_AB) in which their second column contains respectively "A", "B" and "A & B". So, for each table I want to mantain only rows that satisfy the condition on second column.
I 'm trying to use the "contains" statement but it fails with cases "Sol_filtered_A " and "Sol_filtered_B" becasue it maintans always also the case "A & B".
Here is my code:
% Import general solution
Sol_data = readtable('All_database_solution_test.csv','VariableNamingRule','preserve');
% Filter solutions: select if the solution occurs in point A, B or both
Sol_A = contains(Sol_data.Sol_inters,'A','IgnoreCase',false);
Sol_B = contains(Sol_data.Sol_inters,'A','IgnoreCase',false);
Sol_AB = contains(Sol_data.Sol_inters,'A & B','IgnoreCase',false);
Sol_filtered_A = Sol_data(Sol_A,:);
Sol_filtered_AB = Sol_data(Sol_AB,:);
Can you help me to solve this issue?

Accepted Answer

Stephen23
Stephen23 on 22 Jun 2022
Edited: Stephen23 on 22 Jun 2022
"Can you help me to solve this issue?"
CONTAINS() check if the pattern occurs anywhere inside the string, but this could be a substring. So if you want match only the entire string then you need to use the correct tool: MATCHES() or STRCMPI()
  2 Comments
Steven Lord
Steven Lord on 22 Jun 2022
The documentation pages for the matches and strcmpi functions each contain multiple examples showing what each function does.
If you had to use contains (as a requirement of a homework assignment, for instance) remember that contains returns a logical value, one that you can use with the & (and), | (or), and ~ (not) operators.
true & false % false
ans = logical
0
true & ~false % true
ans = logical
1

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