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MATLAB Examples

MATLAB Examples. Selim Aksoy Bilkent University Department of Computer Engineering saksoy@cs.bilkent.edu.tr. MATLAB Examples. Find the number of positive numbers in a vector

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MATLAB Examples

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  1. MATLAB Examples Selim Aksoy Bilkent University Department of Computer Engineering saksoy@cs.bilkent.edu.tr

  2. MATLAB Examples • Find the number of positive numbers in a vector x = input( 'Enter a vector: ' );count = 0;for ii = 1:length(x), if ( x(ii) > 0 ), count = count + 1; endendfprintf('Number of positive numbers is %d\n', count); CS 111

  3. MATLAB Examples • Find the index of the largest number in a vector x = input( 'Enter a vector: ' );max_value = x(1);max_index = 1;for ii = 2:length(x), if ( x(ii) > max_value ), max_value = x(ii); max_index = ii; endendfprintf( 'Max value is %d\n', max_value );fprintf( 'Its index is %d\n', max_index ); • What if the max value occurs more than once? CS 111

  4. MATLAB Examples • Print a triangle of stars in n rows n = input( 'Enter the number of rows: ' );for ii = 1:n, for jj = 1:ii, fprintf( '*' ); end fprintf( '\n' );end CS 111

  5. MATLAB Examples • Find the kth digit of a number (kth digit from the right) num = input( 'Enter the number: ' );k = input( 'Enter the digit you want: ' );num_orig = num;for ii = 1:k, digit = mod( num, 10 ); num = fix( num / 10 );endfprintf('Digit %d of %d is %d\n', k, num_orig, digit); CS 111

  6. MATLAB Examples • Sort the numbers in a given vector x = input( 'Enter the vector to sort: ' );n = length(x);%length of the vector%Sort the vector in ascending order using selection sortfor ii = 1:n-1,%Find the minimum value in x(ii) through x(n) iptr = ii;for jj = ii+1:n,if ( x(jj) < x(iptr) ), iptr = jj;endend%iptr now points to the minimum value,%so swap x(iptr) with x(ii) if ii ~= iptrif ( ii ~= iptr ), temp = x(ii); x(ii) = x(iptr); x(iptr) = temp;endenddisp( 'Sorted vector:' );disp(x); CS 111

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