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The MatLab Language

The MatLab Language. Mathematics Laboratory The MathWorks www.mathworks.com. General. Comments – “%” in first column Result Control - “;” at the end "x=5" x = 5 "x=7;“ "x" x = 7. General (continued). Range Operator "x=3:2:13" x = 3 5 7 9 11 13

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The MatLab Language

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  1. The MatLab Language Mathematics Laboratory The MathWorks www.mathworks.com

  2. General • Comments – “%” in first column • Result Control - “;” at the end • "x=5" x = 5 • "x=7;“ • "x" x = 7

  3. General (continued) • Range Operator • "x=3:2:13" x = 3 5 7 9 11 13 • Line Continuation - three periods • Directory • "dir" announ~2.doc mathview.doc matlab_6.doc matlab~2.doc intro.m matlab.doc matlab~1.doc vector.m announ~1.doc language.m matlab1.doc matlab~1.ppt

  4. General (continued) • Print Working Directory • "pwd" ans = E:\DOC\JEFF\COURSES\BEI\SHORTC~1\MATLAB • Change Directory - cd • "cd .." • "pwd" ans = E:\DOC\JEFF\COURSES\BEI\SHORTC~1

  5. General (continued) • "cd matlab" • "pwd" ans = E:\DOC\JEFF\COURSES\BEI\SHORTC~1\MATLAB

  6. Scalars, Vectors, and Matrices • Creating a row vector • "X=[1,2,3] or X=[1 2 3] X = 1 2 3 • Creating a column vector • "Y=[1;2;3]" or "Y=[1 2 3]" Y = 1 2 3

  7. Vector / Matrix Operations • "Z=[y,2*y,3*y]" creates ? • Z = 1 2 3 2 4 6 3 6 9

  8. Indexing • "Z(2,3)=?" ans = 6 • "W=Z(1:2,2:3)" W = 2 3 4 6 • "W=Z(:,2)" W = 2 4 6

  9. Indexing (Continued) • "W=Z(2,:)" W = 2 4 6 • "Z(2,:)=[6,4,2] does ?" Z = 1 2 3 6 4 2 3 6 9 • "Z(2,:)=[ ] does ?" Z = 1 2 3 3 6 9

  10. Matrix Operations • A+B - Addition, element by element • "ZZ=[1,1,1;2,2,2]" ZZ = 1 1 1 2 2 2 • "W=Z+ZZ" W = 2 3 4 5 8 11

  11. Matrix Operations (Continued) • A' - Transpose • A*B - Matrix Multiplication • "ZZ=ZZ' " ZZ = 1 2 1 2 1 2 • "W=Z*ZZ" W = 6 12 18 36

  12. Matrix Operations (Continued) • A.*B - Element by Element Multiply • Also: A/B, A\B, A./B, A.^2 • Reserved Symbols • Scalars: pi, i, j, inf, NaN, clock, date, ans • "x=pi" x = 3.1416 • "x=i" x = 0 + 1.0000i

  13. Scalars (Continued) • "x=j" x = 0 + 1.0000i

  14. Matrices: zeros, ones, eye • "zeros(3,5)" ans = 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

  15. Matrices (Continued) • "ones(5,3)" ans = 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

  16. Matrices (Continued) • "eye(4)" - the identity matrix ans = 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1

  17. Relational Operators • "<" - less than • "<=" - less than or equal to • ">" - greater than • ">=" - greater than or equal to • "==" - test for equality • "~=" - not equal to • "&" - AND • "|" - OR • "~" - NOT

  18. Control Flow (If) if x>5 & x<8 ------- ------- elseif(x>=8) ------- ------- else ------- end

  19. Control Flow (For Loops) for k=7:21 ------- ------- end

  20. Control Flow (While Loops) k=1; while k=<10 ------- ------- k=k+1; end

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