Define character array char = 'Hallo ich'; Display character array using MATLAB built-in function; Extract word ich into new variable char_ext.

In MATLAB, you can define a character array and manipulate it as follows:

1. Define the character array:
```matlab
charArray = 'Hallo ich';
```

2. Display the character array using a built-in function:
```matlab
disp(charArray);
```

3. Extract the word "ich" into a new variable:
```matlab
char_ext = 'ich'; % Direct assignment since we know the word
```

Alternatively, if you want to extract it programmatically, you can use string manipulation functions:
```matlab
words = strsplit(charArray); % Split the string into words
char_ext = words{2}; % Extract the second word
```

This will give you the desired output.