Starting diary file diary-04-Oct-2010.txt


A = [ .15 -.04 ; .04 .15]
b = [ 0 ; 1.6]
x = A \ b
x = b / A

147 / 49
49 \ 147

A * b
b * A
b
c = [ 3 4]
c * A
ans =
x = c / A
x * A
c
A \ c

B = rand(2)
A
X = A \ B
A*X
A * X - B
A \ B
A / B
B / A
clc

axis([-3 5 0 12])
xlabel('x1')
ylabel('x2')
title('Intersecting lines')
x1 = [-3:5]
x1 =
x2 = .15 * x1 / .04
plot(x1,x2)
hold on
x2 = (1.6 - .04 * x1) /.15
plot(x1,x2,'r')
x = A \ b
clc

A = rand(3)
b =rand(3,1)
x = A \ b
A*x - b

A = [3 1 4 ; 0 1 5 ; 0 0 9]
x = A \ b
A*x - b
b

edit bslashtx
x = A\b
x = bslashtx(A,b)

R = rand(3)
triu(R)
triu(R,1)
tril(R)

A = [10 -7 0 ; -3 -2 6 ; 5 -1 5]
lugui(A)

[L,U,p] = lutx(A)
L * U
A

diary off