It looks like you're new here. If you want to get involved, click one of these buttons!

- 141.5K All Categories
- 104.7K Programming Languages
- 6.4K Assembler Developer
- 1.9K Basic
- 39.8K C and C++
- 4.3K C#
- 7.9K Delphi and Kylix
- 4 Haskell
- 9.6K Java
- 4.1K Pascal
- 1.3K Perl
- 2K PHP
- 518 Python
- 37 Ruby
- 4.3K VB.NET
- 1.6K VBA
- 20.8K Visual Basic
- 2.6K Game programming
- 312 Console programming
- 89 DirectX Game dev
- 1 Minecraft
- 110 Newbie Game Programmers
- 2 Oculus Rift
- 8.9K Applications
- 1.8K Computer Graphics
- 730 Computer Hardware
- 3.4K Database & SQL
- 522 Electronics development
- 1.6K Matlab
- 628 Sound & Music
- 257 XML Development
- 3.3K Classifieds
- 196 Co-operative Projects
- 185 For sale
- 189 FreeLance Software City
- 1.9K Jobs Available
- 600 Jobs Wanted
- 201 Wanted
- 2.9K Microsoft .NET
- 1.7K ASP.NET
- 1.1K .NET General
- 3.3K Miscellaneous
- 4 Join the Team
- 0 User Profiles
- 352 Comments on this site
- 59 Computer Emulators
- 2.1K General programming
- 182 New programming languages
- 604 Off topic board
- 170 Mobile & Wireless
- 44 Android
- 124 Palm Pilot
- 335 Multimedia
- 151 Demo programming
- 184 MP3 programming
- 0 Bash scripts
- 19 Cloud Computing
- 53 FreeBSD
- 1.7K LINUX programming
- 367 MS-DOS
- 0 Shell scripting
- 320 Windows CE & Pocket PC
- 4.1K Windows programming
- 895 Software Development
- 408 Algorithms
- 68 Object Orientation
- 89 Project Management
- 90 Quality & Testing
- 239 Security
- 7.6K WEB-Development
- 1.8K Active Server Pages
- 61 AJAX
- 2 Bootstrap Themes
- 55 CGI Development
- 19 ColdFusion
- 222 Flash development
- 1.4K HTML & WEB-Design
- 1.4K Internet Development
- 2.2K JavaScript
- 34 JQuery
- 284 WEB Servers
- 151 WEB-Services / SOAP

This is my VERY first stab at matlab - a question on my linear algebra homework that is requiring its use. As follows:

A graph with ?ve nodes and m directed edges can be described by an m x 2 matrix M by the following rule:

label the edges as 1,2,...,m.

row i of the matrix M is given by the vector

[starting node number of the edge i, ending node number of the edge i]

(a) Write a MATLAB code (or use another package) that creates the m x 5

incidence matrix A from M. Print A for the complete graph with ?ve nodes (labeled 1, 2, 3, 4 and 5) and all m = 10 edges such that:

The edges are always directed from a smaller node number to a larger

node number

Both columns of M are increasing

(b) Print basis for C(A) and C(AT), the column space and the row space of A.

(c) Print L = AT A and ?nd the nullspace of L.

(d) Compute the projection p of b = (1,2,...,10) onto the column space

C(A). Since the columns of A are dependent, you will have to remove column 5 of A and calculate again the 4 x 4 matrix L1 as in part (c), so that L1 is invertible, to solve L1x = AT b and compute p = Ax.

Here is my code so far, I think I almost got it except for part a) and removing the column in part d). I'm kind of lost in part a) I'm confused as how one does this sort of thing in matlab. I've programmed before my only in java and C.

[code]%Problem #10

%part a)

%part b)

C = colspace(A) % columns are basis for column space of A

R = colspace(transpose(A)) % rows are basis for row space of A

%part c)

L = transpose(A) * A

null(L) %null space of L

%part d)

b = [1;2;3;4;5;6;7;8;9;10];

%remove last colmun from A, update

%compute projection

L1 = transpose(A)* A;

B = transpose(A) * b;

p = A * linsolve(L1,B)[/code]

Terms of use / Privacy statement / Publisher: Lars Hagelin

Programmers Heaven articles / Programmers Heaven files / Programmers Heaven uploaded content / Programmers Heaven C Sharp ebook / Operated by CommunityHeaven LLC

© 1997-2015 Programmersheaven.com - All rights reserved.