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# Lecture7

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### Lecture7

1. 1. Lecture 7 Solving linear equation Eng. Mohamed Awni Electrical & Computer Engineering Dept.
2. 2. Agenda 2 Relational Operators Determinant & inverse of a matrix Solving linear equations  Exercise
3. 3. Relational Operators Relational operators Produce logical values (true OR false) (One or zero) >> 5>2 ans = 1 >> 5<4 ans = 0 >> 1.5<=1.5 ans = 1 >> 2>=pi ans = 0 ans = 0 >> 1.8==1.801
4. 4. • When relational operators are used on arrays, the relational operator is applied element-by-element Relational Operators • Produces a logical array with the same dimensions as the original operands
5. 5. Relational Operators in images
6. 6. Determinant & inverse of a matrix det(v) • Return the determinant of the square matrix. • Matrix must be square • Matrix must be square Inv (v) • Is a matrix such that when multiplied on the right or on the left by the given matrix, yields the identity matrix; I
7. 7. Determinant & inverse of a matrix For a square matrix to have an inverse, its determinant must be non- zero value,
8. 8. Solving linear equations
9. 9. Solving system of linear equations using the inv() function
10. 10. Raise the power of A to -1 left division () operator
11. 11. Exercises