Code covered by the BSD License
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bigscreen(arg)
BIGSCREEN Set graphics properties for large audiences.
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bizcard
BIZCARD Future version of The MathWorks business card.
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blackjack(N)
BLACKJACK. Use random numbers in Monte Carlo simulation.
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brownian.m
BROWNIAN Two-dimensional random walk.
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censusgui(callbackarg)
CENSUSGUI Try to predict the US population in the year 2010.
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circlegen(h)
CIRCLEGEN Generate approximate circles.
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eigsvdgui(A,job)
EIGSVDGUI Demonstrate computation of matrix eigenvalues and singular values.
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fern
FERN MATLAB implementation of the Fractal Fern
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fftgui(y)
FFTGUI Demonstration of Finite Fourier Transform.
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fftmatrix(varargin)
FFTMATRIX Plot columns of the Finite Fourier Transform matrix.
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finitefern(varargin)
FINITEFERN MATLAB implementation of the Fractal Fern.
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flame
FLAME A stiff ordinary differential equation.
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floatgui(callbackarg)
FLOATGUI Show structure of floating point numbers.
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fzerogui(F,ab,varargin)
FZEROGUI Demonstrate the zero finding algorithm used by FZERO.
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greetings(phi)
GREETINGS Seasonal holiday fractal.
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imagesvd(varargin)
IMAGESVD Principle component analysis of monochrome and color images.
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interp2dgui(arg1,arg2)
INTERPGUI Behavior of periodic parametric curves.
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interpgui(arg1,arg2)
INTERPGUI Behavior of interpolating functions.
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lorenzgui
LORENZGUI Plot the orbit around the Lorenz chaotic attractor.
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lugui(A,pivotstrat)
LUGUI Gaussian elimination demonstration.
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ncmgui
NCMGUI Master GUI for Numerical Computing with MATLAB.
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pdegui(action)
PDEGUI Demonstrate solution of model partial differential equations.
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pennymelt(delta)
PENNYMELT Heat a penny.
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pivotgolf(course,pivotstrat)
PIVOTGOLF Pivot Pickin' Golf.
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primespiral(n,c)
PRIMESPIRAL Ulam's prime number spiral.
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quadgui(F,a,b,tol,varargin)
QUADGUI Demonstrate numerical evaluation of a definite integral.
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randgui(randfun)
RANDGUI Monte Carlo computation of pi.
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randncond.m
RANDNCOND Condition of random matrices
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rungeinterp(arg)
RUNGEINTERP Runge's polynomial interpolation example.
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stegano(p,q)
STEGANO Investigate steganography in the default image.
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swinger(x,y,orbitval)
SWINGER Classic double pendulum.
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threenplus1(n)
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touchtone(arg)
TOUCHTONE Use FFT to synthesize and analyze telephone dialing
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walker
WALKER Human gait.
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waves
WAVES Wave equation in one and two space dimensions.
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bslashtx(A,b)
BSLASHTX Solve linear system (backslash)
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crypto97(x)
CRYPTO97 Cryptography example.
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digraph(file)
DIGRAPH Generate and analyze text digraph frequency matrix.
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encrypt(filein,fileout)
ENCRYPT Apply the CRYPTO function to a text file.
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ffttx(x)
FFTTX Textbook Fast Finite Fourier Transform.
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fibnum(n)
FIBNUM Fibonacci number.
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fibonacci(n)
FIBONACCI Fibonacci sequence
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fmintx(F,a,b,tol,varargin)
FMINTX Textbook version of FMINBND
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fzerotx(F,ab,varargin)
FZEROTX Textbook version of FZERO.
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goldfract(n)
GOLDFRACT Golden ratio continued fraction.
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golub(n)
GOLUB Badly conditioned integer test matrices.
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inregion(x,y,xv,yv)
INREGION True for points inside or on a polygonal region.
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lutx(A)
LUTX Triangular factorization, textbook version
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membranetx(k,m,n,np)
MEMBRANETX Textbook version of MEMBRANE, eigenfunctions of L-membrane.
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ode23tx(F,tspan,y0,arg4,varar...
ODE23TX Solve non-stiff differential equations. Textbook version of ODE23.
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pagerank(U,G,p)
PAGERANK Google's PageRank
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pagerankpow(G)
PAGERANKPOW PageRank by power method with no matrix operations.
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pchiptx(x,y,u)
PCHIPTX Textbook piecewise cubic Hermite interpolation.
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piecelin(x,y,u)
PIECELIN Piecewise linear interpolation.
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polyinterp(x,y,u)
POLYINTERP Polynomial interpolation.
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powersin(x)
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qrsteps(A,b)
QRSTEPS Orthogonal-triangular decomposition.
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quadtx(F,a,b,tol,varargin)
QUADTX Evaluate definite integral numerically.
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randmcg(p,q)
RANDMCG Multiplicative congruential uniform random number generator.
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randntx(varargin)
RANDNTX Text book version of RANDN
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randssp(p,q)
RANDSSP Multiplicative congruential uniform random number generator.
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randtx(arg1,arg2)
RANDTX Text book version of RAND
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splinetx(x,y,u)
SPLINETX Textbook spline function.
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surfer(root,n)
SURFER Create the adjacency graph of a portion of the Web.
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tridisolve(a,b,c,d)
TRIDISOLVE Solve tridiagonal system of equations.
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vandal(n)
VANDAL Symbolic Vandermonde matrix.
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Contents.m
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goldrect.m
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sunspotstx.m
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View all files
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| golub(n)
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function A = golub(n)
%GOLUB Badly conditioned integer test matrices.
% GOLUB(n) is the product of two random integer n-by-n matrices,
% one of them unit lower triangular and one unit upper triangular.
% LU factorization without pivoting fails to reveal that such
% matrices are badly conditioned.
% See also LUGUI.
s = 10;
L = tril(round(s*randn(n)),-1)+eye(n);
U = triu(round(s*randn(n)),1)+eye(n);
A = L*U;
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