please help me to solve it

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Abdulrasheed le 22 Oct 2014

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https://fr.mathworks.com/matlabcentral/answers/159597-please-help-me-to-solve-it

Modifié(e) : Abdulrasheed le 22 Oct 2014

Exercise 1 . Use the function modified from Table 8.5-2, Page 355 listed below to solve the problems listed for Problem 17 plus the additional problem A = [ 3 -4; 6 -8]; b=[ 5; 2]; Part b. Draw the modified flow chart for this code reflecting the changes made to the program in the book. A copy of the book figure is posted. function [ x ] = lineq( A, b ) % Modified Function from Palm, 8.5-2, computes linear equation solution % with checks for valid solutions sizeA = size(A); if rank(A) == rank([A b]) % The ranks are equil. if rank(A) == sizeA(2) % number of independent equations = # of variables disp(' Unique solution'); x = A\b; display(x); else % rank of A less than the number of unknowns disp(' Infinite number of solutions'); rr = rref( [ A b ]); fprintf(' Reduced Row Echelon Form =\n'); disp(rr); disp(' Psuedo inverse result'); x = pinv(A)*b; fprintf(' x =\n'); disp(x); end else if( rank([ A b ]) > sizeA(2) ) % Too much information disp(' Least Squares Solution') x = A\b; fprintf(' x =\n'); disp(x); else % 0*x = b - a solution is infinite disp(' Psuedo inverse result'); x = pinv(A)*b; fprintf(' x =\n'); disp(x); end end % check the result,this should be close to zero. fprintf(' A x - b =\n'); disp( A*x-b ); end

Exercise 2: In the space below, write the Matlab code you would need to graphically find the solution to the set of equations given below, using a PLOT command. -2x + y = -5 (1) 2x + y = 5 (2)

Exercise 3: Three cables are used to tether a balloon as shown. Determine the vertical force P exerted by the balloon at A knowing that the tension in cable AD is 481 N. Use a matrix linear equation solution method