# Monthly Archives: February 2013

## AMAT 415 — Weeks 6 & 7 problems

Please report typos and errors by email. 28) Find all the solutions of .  (Hint: Rewrite the equations in terms of exponentials and manipulate it into a quadratic equation in the variable .) 29) Suppose is analytic on .  Let … Continue reading

## AMAT 415 — Matlab activity 5: Downsampling, upsampling and interpolation

(As usual, please report errors or typos by email.) Let’s plot the cosine wave of frequency 60 Hz, sampled 1000 times per second for 1 second: t = 0:0.001:1-0.001; x = cos(2*pi*60*t); plot(t,x); (Maximize your figure window if the graph … Continue reading

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## AMAT 415 — Assignment 2 solutions

Here are the solutions to assignment 2: pdf Please report any typos or errors to me by email.

## AMAT 415 — Midterm 1 solutions

Here are the solutions for midterm 1: pdf

## AMAT 415 — Letter grade conversion

Here are the numerical grades you need to achieve to be guaranteed given letter grade. A+ 95-100 A 90-94.99 A- 85-89 B+ 80-84.99 B 75-79.99 B- 70-74.99 C+ 65-69.99 C 60-64.99 C- 55-59.99 D 50-54.99 F < 50

## AMAT 415 — Hints for assignment 2

Here are some hints for assignment 2: pdf Please report any errors or typos.

## AMAT 415 — Aliasing and leakage

Here are the pictures I showed in class to illustrate aliasing and leakage.

## AMAT 415 — Matlab activity 4: Reversing, shifting and convolution

(Added 2013.02.06: Here are a few hints: pdf) In this activity we study the some basic operations on signals and their interaction with the discrete Fourier transform. First, we will write a function that will reverse a signal.  That is, … Continue reading