Unit10 Lab A - 7-A.4 function anArray = Prob7_A_4 % creates...

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Unformatted text preview: 7-A.4 function anArray = Prob7_A_4 % creates the array given in the problem definition % INPUTS: None % OUTPUT: the array given in Problem 7-A.4 anArray = [7:7:42; 6:-2:-4; 44:11:99; -9:4:11; 61:-25:-64]'; 7-A.10 function anArray = prob7_A_10(anArray) % sets the corners of the input array to 99 % INPUT: An n by m array % OUTPUT: The modified n by m array anArray(1,1)=99; anArray(1,end)=99; anArray(end,1)=99; anArray(end,end)=99; %or... %anArray([1,end],[1,end])=99 % or... % [n,m] = size(anArray); % anArray([1,n,n*(m-1)+1,n*m])=99; 7-A.12 function anArray = Prob7_A_12(anArray) % reverses the order of elements in the second column % of the input array % INPUT: An n by m array % OUTPUT: An n by m array anArray(:,2) = anArray(end:-1:1,2); 7-A.16 function solnVector = Prob7_A_16 % Solves the system of equations: % 2x+5y+z=12 % x+2y-3z=5 % x-y+z=-1 % INPUTS: None % OUTPUT: A column vector of [x; y; z] A = [2 5 1;1 2 -3; 1 -1 1]; B = [12; 5; -1]; solnVector = A\B; 7-A.17 function solnVector = Prob7_A_17 % Solves the system of equations: % x+y-z=6 % 2x-y+2z=3 % 3x+2y+5z=35 % INPUTS: None % OUTPUT: A column vector of [x; y; z] A = [1 1 -1; 2 -1 2; 3 2 5]; B = [6; 3; 35]; solnVector = A\B; 7-A.18 function solnVector = Prob7_A_18(V, coeff) % solves linear system of equations % INPUTS: A vector of the right hand-side values V % An array of system coefficients coeff % such that: % coeff*X = V % OUTPUT: The solution in a column vector solnVector = coeff\V; 7-A.19 function [locations, values] = Prob7_A_19(anArray) % finds the indices and values of the elements in an array % that are less than zero % INPUT: An array % OUTPUTS: An nx2 array of indices % An nx1 vector of values [locationRow locationCol] = find(anArray<0); locations = [locationRow locationCol]; values = anArray(find(anArray<0)); ...
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Unit10 Lab A - 7-A.4 function anArray = Prob7_A_4 % creates...

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