Difference between revisions of "Homework 2" - Rhea

Latest revision as of 23:38, 1 July 2009

Problem 1

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Problem 7

Adam has posted some Helpful Youtube videos which will be very helpful in working this problem. Nice find! - Landis

7. Convolution implementation Write a Matlab function that per- forms convolution of two discrete-time input signals. Note that the theoretical convolution defined in class has signals $$ x[n] $$ defined for $n \in ( -\infty , \infty )$ . Since this is not practically realizable, have your code assume that a finite-length input signal is such that it is zero outside of the specified range. For example, both signals $$ x_1[n] $$ and $$ x_2[n] $$ plotted below can be represented by a vector in Matlab as [2, 3, 1]. Compare your code’s functionality against the builtin Matlab function conv (type “help conv” on the command line for more information).

So, are you saying that our code cannot call the function conv, but can use for loops even though they are slow. Just clarifying-- Adam Frey
Yes, your function may use loops, but should not call the conv function. I simply want you to write a function that works identically to conv. If you are feeling ambitious, you can try this without loops, though I would strongly recommend writing it using for-loops first. Huffmalm

Another note: if you are unfamiliar, you may define functions in matlab by including "function" on the first line of your .m file. For instance, write

function y = myconv(x,h)

at the top of the script which performs convolution of x and h and calls the output y. Then save the function as myconv.m. In this way, the user can input x and h from the command line, and call your function simply by typing "myconv(x,h)" on the command line. Huffmalm

Bonus (Convolution without loops)

Ted Schnittgen_ECE301_Summer2009

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@@ Line 16: / Line 16: @@
 . Convolution implementation Write a Matlab function that per-
 forms convolution of two discrete-time input signals. Note that the
-theoretical convolution defined in class has signals x[n] defined for
+theoretical convolution defined in class has signals <math>x[n]</math> defined for
-n 2 (−1,1). Since this is not practically realizable, have your code
+<math> n \in ( -\infty , \infty )</math>. Since this is not practically realizable, have your code
 assume that a finite-length input signal is such that it is zero outside of
-the specified range. For example, both signals x1[n] and x2[n] plotted
+the specified range. For example, both signals <math>x_1[n]</math> and <math>x_2[n]</math> plotted
 below can be represented by a vector in Matlab as [2, 3, 1]. Compare
 your code’s functionality against the builtin Matlab function conv (type
 “help conv” on the command line for more information).
-So, are you saying that our code cannot call the function conv, but can use for loops even though they are slow. Just clarifying-- Adam Frey
+* So, are you saying that our code cannot call the function conv, but can use for loops even though they are slow. Just clarifying-- Adam Frey
+* Yes, your function may use loops, but should not call the conv function.  I simply want you to write a function that works identically to conv.  If you are feeling ambitious, you can try this without loops, though I would strongly recommend writing it using for-loops first. [[User:Huffmalm|Huffmalm]]
+Another note: if you are unfamiliar, you may define functions in matlab by including "function" on the first line of your .m file.  For instance, write
+function y = myconv(x,h)
+at the top of the script which performs convolution of x and h and calls the output y.  Then save the function as myconv.m.  In this way, the user can input x and h from the command line, and call your function simply by typing "myconv(x,h)" on the command line. [[User:Huffmalm|Huffmalm]]
+* [[HW 3.7 - Arjun Bajaj 301_summer 09]]
+* [[HW 3.7 - Navroz Kwatra 301_Summer 09]]
+* [[HW 3.7 - Anish Venkat 301_summer09]]
+* [[HW 3.7 - Howard Ho_ECE301_Summer2009]]
+* [[HW 3.7 - Ryne Rayburn_ECE301_Summer2009]]
+* [[HW 3.7 - Rob Swanson_ECE301_Summer2009]]
+* [[HW 3.7 - Nick Gentry_ECE301_Summer2009]]
+* [[HW 3.7 - Lu Zhang_ECE301_Summer2009]]
+* [[HW 3.7 - Joseph Yu_ECE301_Summer2009]]
+* [[HW 3.7 - Tyler Mattmuller_ECE301_Summer2009]]
+* [[HW 3.7 - Ted Schnittgen_ECE301_Summer2009]]
+* [[HW 3.7 - Adam Frey_ECE301_Summer2009]]
+* [[HW 3.7 - Vishal Ramani_ECE301_Summer2009]]
+* [[HW 3.7 - Muhammad Aizuddin Zulkifli_ECE301_Summer2009]]
+* [[HW 3.7 - William Owens_ECE301_Summer2009]]
+* [[HW 3.7 - Shannon Abrell_ECE301_Summer2009]]
+* [[HW 3.7 - Yicheng Guo_ECE301_Summer2009]]
+* [[HW 3.7 - Adam Siembida_ECE301_Summer2009]]
+* [[HW 3.7 - James Phillips_ECE301_Summer2009]]
+* [[HW 3.7 - Mohd Faiz Mohd Asri_ECE301_Summer2009]]
+* [[HW 3.7 - Evan Witkoske ECE301 summer2009]]
+* [[HW 3.7 - Jamis_Martin_ECE301_Summer2009]]
+== Bonus (Convolution without loops) ==
+* [[Ted Schnittgen_ECE301_Summer2009]]
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