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MATLAB Lab Session 6 Recap: Mastering Environment, Operations, and Basic Array Manipulations

In this session recap, we cover essential MATLAB tools and functionalities, including navigating the main window, using the M-File Editor, Command Window, and Debugger. You must familiarize yourself with array and matrix creation, indexing, and manipulation techniques, as well as relational and logical operations. Engage in practical tests and exercises to reinforce your understanding. Explore additional challenges related to leveling land for construction and compute the required soil volume. Don’t forget to submit any questions via email while respecting the guidelines.

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MATLAB Lab Session 6 Recap: Mastering Environment, Operations, and Basic Array Manipulations

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  1. IT1005 Lab session on week 6 (2nd meeting)

  2. Lab 2 - Recap • By now, you must ensure that you are familiarwith Matlab environments: • Matlab main window, M-File Editor, Command Window, Workspace, Figure Window, Docking, etc. • Matlab debugger, breakpoint, stepping functions, looking at workspace during stepping, ‘go to cursor’, adjusting program based on the error messages, etc. • Remember that you can always just select Matlab codes using ‘Select tool’ in Adobe Acrobat, then do copy-paste to Matlab rather than typing it all again. • For lab assignments, for trying codes in lecture notes, etc.

  3. Symbols and Keyboard Locations The other keys should be quite straightforward… http://en.wikipedia.org/wiki/Keyboard_layout#US

  4. Review on Array/Vector/Matrix • Creation • mat = [], repmat, ones, zeros, eye, diag, rand, etc • Accessing elements/indexing (index start from 1!) • mat(indices), the usage of ‘:’, mat([indices1 … indicesn]) • Manipulation: add, edit, delete row/col, sort, find • mat(:,x) = y • Operation: +, -, *, /, .*, ./ • matA op matB, mat op scalar (scalar expansion) • Multidimensional array: 3-D… • We seldom go beyond 3D…

  5. Quick Test • Simple test to about array: • Create an array of size 4*5 with all ‘1’ (then all ‘0’). • Try repmat, manual creation, using [1;1;1;1]*[1 1 1 1 1] =) • Compute this: [1 2] .* [2 1] = [3 4] [2 1] • Change .* to *, ./, /, +, or - • Create this array [1 2 3; 4 5 6; 7 8 9],then perform these operations: • Change the 2nd row to 100 90 80! • Change the 3rd col to 20 10 0! • Change the main diagonal to all zeros!

  6. Relational and Logical Operations • Matlab relational operations • <, >, <=, >=, ==, ~= • relational operations on array  the result is array • floating-point imprecision  use eps • Logical operators • &, |, ~, &&, || • short circuit

  7. Quick Test • Simple test to about relational/logical operations: • How to make these statements produce ans = 1 • You can only supply ONE single operatoror MATLAB function to replace ‘…’ • 10+30*2-5/4 … 2*5-10 • sin(pi) == 0? • … ( [10 20 30] / 10 ... [1 2 3] ) • 10 > 20 ... 5 … 2 • 10 > 5 … 5 > 2 • … … 10 > 20 && 5 < 2 …

  8. Lab 3 – Free and Easy Time • Now, you are free to explore Matlab,especially to find answers for Lab 3 • For those who have done Lab 3, try this extra challenges!The solution is at the end of this session • There is a land of size 3m*5m • The height of each square meter on that land is known:[1 2 3 4 5; 2 3 4 5 6; 7 7 7 7 7] above sea level (denoted in meter). • A house of size 3*5 is going to be built there. • Before building it, the land must be leveled! • We want the land to have height 5m above sea level. • Question: what is the minimum amount of soil (in cubic meter) thatmust be added (or perhaps removed) in order to make this land flat? • Hint: explore array operations, Matlab function ‘sum’, and ‘mesh’ or ‘surf’!

  9. Lab 3 Marking + Midterm Test • I will be away • @ Jakarta, Indonesia during mid semester break • 22 Feb night – 2 March • Lab 3 marks will be available on 3 or 4 March. • Will not be as fast as Lab 0/1 last week. • If you have any questions, try IVLE forum first,ask your class mates, or ask Colin. • I will occasionally check my emails from home,but will not be able to reply that fast! • Or ask on Monday morning, before your Mid-term exam!

  10. Remember This! • E-mail answers to: stevenhalim at gmail.com • With subject header: • “IT1005-LabGroupID” “FullName”, • e.g. IT1005-7A StevenHalim • Mr Gmail will sort your emails for me =) • Try to submit your answers ONCE • Do not submit again to fix some minor mistakes! • Shorter (but correct) answers ~ better marks =) • Remember, I have ~100 emails/week !

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