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IT1005

IT1005. Lab session on week 6 (2 nd meeting). Lab 2 - Recap. By now, you must ensure that you are familiar with Matlab environments: Matlab main window, M-File Editor, Command Window, Workspace, Figure Window, Docking, etc.

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IT1005

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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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