CS112 Scientific Computation Department of Computer Science Wellesley College Scientific Computation MATLAB Examples.

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CS112 Scientific Computation Department of Computer Science Wellesley College Scientific Computation MATLAB Examples

1-2 Data visualization and analysis ● Graphical display of data ● Statistical analysis of data ● Fitting functions to data

MATLAB Examples1-3 Sunspots ● Discovered independently by Christoph Scheiner (1610) and Galileo (1613) ● Indicate disturbances in the sun’s magnetic field ● The number of sunspots varies over time in a cyclical way ● Sunspot Cycle* discovered by Samuel Schwabe (1843) * There is some connection between sunspots and extreme weather

MATLAB Examples1-4 The sunspot data: How can we determine the length of the sunspot cycle?

MATLAB Examples1-5 The length of the sunspot cycle: ~ 12 years Note: virtually no sunspot activity in the years (Europe’s mini ice-age) and we’re currently in a low spot in the cycle!

MATLAB Examples1-6 Recent NASA sunspot data… eek!

MATLAB Examples1-7 Visualizing data

MATLAB Examples1-8 Creating and analyzing images Whodunit? Catching a ball Counting stars Visual illusion

MATLAB Examples1-9 Ribonucleic acid ● An RNA molecule is a sequence of nucleotides drawn from Adenine (A), Guanine (G), Cytosine (C), and Uracil (U) ● Three adjacent nucleotides form a triplet called a codon that corresponds to a single amino acid ● You’ll write a MATLAB program that translates a sequence of RNA nucleotides to an amino-acid sequence: UANCUAUCUAUCUUCCGGUC...  Tyr Leu Ser Ile Phe Gln Val....

MATLAB Examples1-10 Searching databases ● What is the average cholesterol level for women in their twenties who exercise at least 30 minutes a day? 189 cholesterol age sex exercise ‘m’ ‘f’‘m’ ‘f’

MATLAB Examples1-11 Designing GUI’s* ● Graphical User Interfaces simplify communication with our programs by using text boxes, pop-up windows, buttons, menus, check boxes, sliders, etc. ● We’ll use MATLAB’s GUI facilities to build our own interactive programs * Pronounced “gooey”

MATLAB Examples1-12 Animations & simulations Perceptual experiments (Oly Fernando ’08) Simulating the spread of a virus