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02-Matlab Fundamentals

02-Matlab Fundamentals - 2 Matlab Fundamentals Chapter...

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2: Matlab Fundamentals 2: Matlab Fundamentals
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Sep 20, 2006 13:17 ECOR2606 -- Hassan & Holtz 2 Chapter Objectives Introduction and overview of Matlab command mode and its use in interactive computations. Assignment of numbers (scalars) to variables. Assignment of vectors and matrices to variables; colon operator, linspace and logspace functions. Understand priority rules (for + , * , ^ , etc.) in arithmetic expressions. General understanding of some built-in functions. Use of the Help facilities. Learn how to use vectors to create simple plots of arithmetic expressions.
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Sep 20, 2006 13:17 ECOR2606 -- Hassan & Holtz 3 2.1 The Matlab Environment Matlab has 3 primary windows: Command Window – enter commands and data, see results. Graphics window – used to display plots and graphs. Edit window – edit m-files (Matlab programs). See next chapter. Command window prompt: >> Enter arithmetic expressions: >> 55 – 16 Result is displayed: ans = 39 Can use the variable 'ans': >> ans + 11 ans = 50
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Sep 20, 2006 13:17 ECOR2606 -- Hassan & Holtz 4 2.2 Assignment Scalar values can be assigned to variables: >> a = 4 a = 4 Variable names are case-sensitive : >> A = 5 A = 5 (output reformatted for brevity) >> a a = 4 >> A A = 5 Statements (“ commands ”) ending in ';' have output suppressed: >> A = 6; Several statements can be on one line: >> a = 4, A = 6; x = A-5; a = 4
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Sep 20, 2006 13:17 ECOR2606 -- Hassan & Holtz 5 Matlab Workspace Workspace contains variables and their values, functions, etc. Private to each user. Accumulates values and data as you work. Initially empty when Matlab starts except for built-in variables: sqrt of -1 ̶ 3.14159... ̶ 2.7183... ̶ eps realmin realmax Workspace normally disappears when Matlab exists Can be saved and restored later, on a different machine not usually done, as other techniques (scripts, m-files) are usually better. Very bad idea to change these built-in variables (except for i , j ).
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Sep 20, 2006 13:17 ECOR2606 -- Hassan & Holtz 6 2.2 Assignment (contd.) Matlab can deal with complex numbers: >> x = 2 + 4*i x = 2 + 4i >> x*x ans = -12 + 16i i and j are indistinguishable in defining complex numbers: >> x = 2 + 4*j
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