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Enhancing MATLAB Skills Through Guided Practice and Graded Tasks

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  1. Laboratory 2

  2. LABORATORY OBJECTIVES • This lab work is intended to give the students more insights on the Matlab environment and how to work more efficiently with the commands window. • The work is organized in two parts : • Part 1 : guided work, where the students can work through the examples or procedures seen during the lectures • Part 2 : graded tasks through which the students demonstrate ability to apply what they learned independently.

  3. PART 1 : GUIDED TASKS A. Example • solving a quadratic equation using Matlab as a calculator • Imagine that an engineering problem led to the following second degree polynomial : 3x2 – x +2 =0 • Answer : • Compute descriminant : d=b2 – 4ac • If d=0  x1=x2=-b/2a • If d>0  x1,2=(-bd)/2a • If d<0  x1,2=(-bid)/2a (complexe numbers)

  4. Using the commands window, enter the following commands : • First use assignment statements to define the coefficients a, b, and c • >> a=…… ; • >> b=……; • >> c=……;

  5. Next, compute the descriminant (don’t use the semi-column ; to display the value of d !) : • >> d=…………. • d = • …………

  6. Then, compute the solutions : • >> x1= ……………………… • >> x2=………………………

  7. Note that in this example you have used Matlab as a calculator; Be informed that Matlab can solve this in a much simpler manner by the use of the function “roots” which will be studied later in the semester.

  8. Part 1 B. Working efficiently with the commands window

  9. Type “whos” to display the list of all defined variables • Clear the coefficients a, b, and c • See what happens when you type the following • >> a or >> b or >> c or >> d • Next type >> clear  This should result in deleting all variables ! • Finally, enter >> clc to clear the screen display

  10. Part 2 (Graded Tasks) 1. MatlabMathematic Built-in functions

  11. Part 2 (Graded Tasks) • 2. Common Error

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