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## Octave and Matlab

1) Exercises for Octave / Matlab:

(a) If A is a matrix created by command A=rand(10,10);, what is a command to get the sub-matrix of elements whose both coordinates are odd?

(b) Write an expression for the sum of the integers from 1 to 100.

(c) Write an expression for the sum of the powers of 0.5 to the numbers from 1 to 10.

2) Download and decompress (stock prices: date, open, high, low, close, volume) (18MB)  stckPrcs.tar.bz2

(a) in Octave, ‘load’ BDXA (in B/BDXA.us.txt and Octave needs to be in directory where BDXA.us.txt is):

(b) at which data the BDXA had the highest price (need to use functions below for date as solution):

m = max(BDXA(:,2))

i = find(BDXA(:,2) == m)

date = BDXA(i, 1)

For the submission

1) send in the plain text the commands you used in part 1) (a,b,c) : there should be 3 lines.

2) send in the plain text the ‘date’ variable you found in part 2) b) : there should be one number.

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