1.000  Comp Programming for Sci & Eng

office hour today canceled

Hi class,

I have to cancel the office hour today since I am feeling under the weather. Roberto will have office hour next Monday (10-11:30am), in the Ippen Room (48-311). He will also have graded homework 8, 9, and 10 for you to pick up. I will release solution to pset #10 by Saturday so you will have all the materials to study.

Best of luck on the final! Don't forget to fill out the teaching evaluations :)

Best,
Ruby

Announced on 11 December 2014  3:06  p.m. by Xiaojing Fu

Wavelet question

Hello class

There was a question after the class today on how to choose the thresholds on the details coefficients for de-noising. There are different methods to select threshold, as you can see on the De-noising window. In the noisy doppler example, we chose a fixed form threshold method. This gives a threshold of stddev_noise*sqrt(2*ln(N)), where stddev_noise is the standard deviation of noise, and N is the length of the signal. The value of sqrt(2*ln(N)) gives minimum of the maximum mean square error. In our case, a white noise with stddev_noise=1 was used. So the threshold was sqrt(2*log(1000)) = 3.72.

We can also see it differently in our case: since we know that there are no details in the original signal at late time (frequencies decreasing with time in the doppler signal), we choose a threshold window that encompasses the late time in detail signal entirely.

The lecture note is uploaded on the Stellar.

Best
Birendra

Announced on 09 December 2014  12:19  a.m. by Birendra Jha

Office hours

Hi all,

I will have office hours this week on Wednesday (10-11:30am) instead of tomorrow and next week on Monday (10-11:30am), both in the Ippen Room (48-311).

Best,
Roberto

Announced on 08 December 2014  9:50  a.m. by Roberto Rusconi

Homework #10 posted

Hi all,

Homework #10 has been posted. It will be due this Friday (Dec. 5th) at 3pm. The lecture notes on Fourier Transforms are also available now on course website.

Best,
Ruby

Announced on 02 December 2014  11:44  a.m. by Xiaojing Fu

Office hours on Tue 16 moved to Mon 15

Hi all,

The office hours of Tuesday, December 16 have been moved to Monday 15. Same time (10-11.30 am) but different location (Ippen Room, 48-311).

Best,
Roberto

Announced on 02 December 2014  11:39  a.m. by Roberto Rusconi