Question

Question 8
Data Structures - arrays, matrices and strings
(a)
Write a MATLAB script that will copy all of the negative values in a matrix,M, to a new vector, N.[7 marks]

(b) Write a MATLAB script that reads in two strings from the user and comparesthem, printing’same’if they are the same or the indexes of the characterswhich differ if they are different. For example, if the user typed in ’car’and ’cat’, the script would print ’the words differ in characters: 3’. For thisquestion, you can assume the two strings entered are of the same length.[6 marks]

Answer 1

Answer a)
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To get all -ve value in matrix M to a new vector N, the following code can be used
M = [1 2 -4 5;-6 9 -10 8] %make a matrix
N = M( M < 0) %copy -ve value from M to N

Answer b)
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s1 = input('Enter string 1: ', 's');
s2 = input('Enter string 2: ', 's');
if s1 == s2
   disp('same');
else
   idx = find(s1 ~= s2);
   disp(['the words differ in characters: ', num2str(idx)]);
end

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output
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Enter string 1: > cat
Enter string 2: > car
the words differ in characters: 3