1 / 17

Lecture 1: Matlab Universe

Lecture 1: Matlab Universe. Tom Rebold ENGR 52. Course Overview. The Way the Class Works. I lecture for 15 – 20 minutes You do lab for 30 – 40 minutes Labs link to extra Problems online for fast students Everyone turn in a solution to the last problem they solve today

menriquez
Download Presentation

Lecture 1: Matlab Universe

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lecture 1: Matlab Universe Tom Rebold ENGR 52

  2. Course Overview

  3. The Way the Class Works • I lecture for 15 – 20 minutes • You do lab for 30 – 40 minutes • Labs link to extra Problems online for fast students • Everyone turn in a solution to the last problem they solve today • HOMEWORK: Bring in 3 Math problems to solve…medium, hard, impossible • We’ll have independent study time

  4. To Buy Matlab • Student Version, $100 • Can purchase, download online • Link from ENGR196.3 class webpage • Bookstore does not stock • MATLAB retails for $1600, so it’s a pretty good deal • BETTER DEAL: FreeMAT !! • Open source version, powerful, free, legal

  5. Why MATLAB • 10x faster compared to other choices: • C++, Fortran, Java • Excel, MathCad, Mathematica, Labview • Matlab is a Very High Level Language • Designed for complex numerical calculations • Vast array of Toolboxes for different specialties • Excellent visualization tools • Symbolic math somewhat awkward • Simulink for modelling dynamic systems, 10x faster still

  6. Today’s Agenda • MATLAB Overview • Working in MATLAB’s Environment • Simple calculations, variables

  7. MATLAB’s ENVIRONMENT

  8. Download week1.zip • Follow instructions in Lab1 • View toolbox demos • Experiment with workspace configuration

  9. Numeric Data • At it’s most basic level, Matlab can be used as a simple calculator, by typing in an arithmetic expression and hitting enter. For example, at the command prompt, type: >> 8/10 >>4 * 3 >>8/10 + 4*3 >>9^2 (what does the ^ operator do? )

  10. Arithmetic rules of precedence >> 8 + 3*5 >> 8 + (3*5) >> (8 + 3) * 5 >> 4^2 – 12 >> 8/4*2 >> 8/(4*2) >> 3*4^2 >> (3*4)^2 >> 27^(1/3) >> 27^1/3

  11. built in functions • Matlab has hundreds of built in functions to do more complicated math • sqrt(9) • log10(1000) • log(10) • pi • cos(pi) • i • exp(i*pi)

  12. Variables • Usually we need to hang on to the result of a calculation • We need a way to name memory for storage • Variable--name of a place in memory where information is stored • r = 8/10 • r • s=20*r • score = 4 * r + s • z = sqrt(1000) • z = sqrt(s)

  13. Assignment Operator • = means “gets” • Translation: MATLAB: r = 8/10 ENGLISH: r “gets” the value 8/10 • OK in Math x + 2 = 20 NOT OK IN MATLAB !! (only variable on Left Side)

  14. Expressing Math in MATLAB 2 • yx _______________x-y • 3x _______________2y

  15. Saving Work in Matlab Script (.m) files • You’ll want to build up complex calculations slowly • Try, correct, try again, improve, etc • .m Files store your calculations • Can be edited in Matlab • Can be re-executed by typing the file name

  16. Example .m file • Volume of a Cylinder. The volume of a cylinder is V= pr2h. A particular cylinder is 15 meters high with a radius of 8 meters. We want to construct another cylinder tank with a volume 20% greater, but with the same height. How large must its radius be? The session follows: • r = 8; • h = 15; • V = pi*r^2*h • V = V + 0.2*V  adds 20% to V • r = sqrt(V/ (pi * h)) Put this in a file calledcyl_volume.m to save retyping

  17. Solve some problems! • Pick any problem, solve it and print your solution .m file • Write name, turn in • You may wish to save your class .m files on a USB drive

More Related