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OCEAN 240B (eventually OCEAN 215) Methods of Oceanographic Data Analysis Spring Quarter, 2015 S. Riser, Professor O. Coyle, TA E. Wilson, TA 1:30 – 3:20 Monday/Wednesday, OSB 111 hOp://flux.ocean.washington.edu/ocean_240B Concepts: (1)  EsPmaPng the mean N
1
x = x ( ti ) ; x = ∑ xi
N 1
(for example, x(t) = temperature at a point) (2)  EsPmaPng the variance and standard deviaPon N
1
2
2
x = x ( ti ) ; σ = ∑ ( xi − x )
N 1
(3)  EsPmaPng the probability distribuPon (histogram) Concepts (conPnued): (4) EsPmaPng the relaPonship (correlaPon) between x(t) and some other variable y(t) (5) FiWng a line or a curve to the relaPonship between x(t) and some other variable y(t)
(6) Reading various types of data files (7) PloWng data: how to do it in order to analyze results and get your point across to the audience (8) AppreciaPng and understanding errors in data (accuracy; precision; measurement error) How will we do this? We will learn the basic elements of a programming language in order to be able to carry out basic parameter esPmaPon from oceanographic data. Excel Fortran Matlab C, C++ , Java R Python Python CompuPng the sum of the first 100 integers 100
x = ∑ xi ; xi = {1, 2, 3,............., 100}
1
( = 5050) sum100=0 for num in xrange(101): sum100 = sum100+num print sum100 (SR) N ( N + 1)
= 5050
Gauss’s sum: SG =
2
sum(xrange(101)) print sum (EW) def sumInt(i_min, i_max): """Efficiently calculate the sum of the integers from i_min to i_max (inc.) """ n = abs(i_max -­‐ i_min) if n == 0: #both ints are the same return i_min elif (n % 2) == 0: #there are an even number of ints to sum return n/2*(i_max + i_min) else: #there are an odd number of ints to sum (OC) return (n+1)/2*(i_max + i_min) Grading 6-­‐7 homework assignments (given some data, perform some calculaPons on the data and produce a plot and scienPfic interpretaPon of results, using Python) The last assignment might be a double assignment in the form of a short project and oral presentaPon. Grades based on accuracy and efficiency of the code, graphics (plots) produced, and interpretaPon. NOTE: no mid-­‐term exam, no final exam.