You want to find all positions of the substring 'ana' in str = 'banana bandana' and check if it exists. Which code correctly does this?

hard📝 Application Q15 of 15

MATLAB - String Handling

You want to find all positions of the substring 'ana' in str = 'banana bandana' and check if it exists. Which code correctly does this?

Apositions = strfind('ana', str); exists = contains('ana', str);

Bpositions = contains(str, 'ana'); exists = strfind(str, 'ana');

Cpositions = find(str, 'ana'); exists = contains(str, 'ana');

Dpositions = strfind(str, 'ana'); exists = contains(str, 'ana');

Step-by-Step Solution

Solution:

Step 1: Use strfind to get positions
strfind(str, 'ana') returns all starting indices of 'ana' in the string.
Step 2: Use contains to check existence
contains(str, 'ana') returns true if 'ana' is found anywhere in str.
Step 3: Verify options
positions = strfind(str, 'ana'); exists = contains(str, 'ana'); correctly uses both functions. positions = contains(str, 'ana'); exists = strfind(str, 'ana'); swaps roles. positions = strfind('ana', str); exists = contains('ana', str); reverses arguments. positions = find(str, 'ana'); exists = contains(str, 'ana'); uses invalid function find for strings.
Final Answer:
positions = strfind(str, 'ana'); exists = contains(str, 'ana'); -> Option D
Quick Check:
Positions with strfind, existence with contains [OK]

Quick Trick: Use strfind for positions, contains for true/false [OK]

Common Mistakes:

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