lecture 3 matrix algebra a vector can be interpreted as a file of data a matrix is a collection of...
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Lecture 3Matrix algebra
Species Taxon GuildMean length (mm)
Site 1 Site 2 Site 3 Site 4
Nanoptilium kunzei (Heer, 1841) Ptiliidae Necrophagous 0.60 0 0 0 0Acrotrichis dispar (Matthews, 1865) Ptiliidae Necrophagous 0.65 13 0 4 7Acrotrichis silvatica Rosskothen, 1935 Ptiliidae Necrophagous 0.80 16 0 2 0Acrotrichis rugulosa Rosskothen, 1935 Ptiliidae Necrophagous 0.90 0 0 1 0Acrotrichis grandicollis (Mannerheim, 1844) Ptiliidae Necrophagous 0.95 1 0 0 1Acrotrichis fratercula (Matthews, 1878) Ptiliidae Necrophagous 1.00 0 1 0 0Carcinops pumilio (Erichson, 1834) Histeridae Predator 2.15 1 0 0 0Saprinus aeneus (Fabricius, 1775) Histeridae Predator 3.00 13 23 4 9Gnathoncus nannetensis (Marseul, 1862) Histeridae Predator 3.10 0 0 0 2Margarinotus carbonarius (Hoffmann, 1803) Histeridae Predator 3.60 0 5 0 0Rugilus erichsonii (Fauvel, 1867) Staphylinidae Predator 3.75 8 0 5 0Margarinotus ventralis (Marseul, 1854) Histeridae Predator 4.00 3 2 6 1Saprinus planiusculus Motschulsky, 1849 Histeridae Predator 4.45 0 5 0 0Margarinotus merdarius (Hoffmann, 1803) Histeridae Predator 4.50 5 0 6 0
A vector can be interpreted as a
file of data
A matrix is a collection of
vectors and can be interpreted as a data base
The red matrix contain three
column vectors
Handling biological data is most easily done with a matrix approach.An Excel worksheet is a matrix.
A general structure of databases
11 1n
m1 mn
a a
A
a a
11 12 13
21 22 23
31 32 33
a a a
V a a a
a a a
1
2
3
4
a
aV
a
a
1 2 3 4V a a a a
The first subscript denotes rows, the second columns.n and m define the dimension of a matrix. A has m rows and n columns.
Two matrices are equal if they have the same dimension and all corresponding values are identical.
Column vector
Row vector
11 12 13
21 22 23
31 32 33
a a a
V a a a
a a a
1234
8765
6543
4321
A
In biology and statistics are square matrices An,n of particular importance
1864
8753
6542
4321
A
The symmetric matrix is a matrix where An,m = A m,n.
1864
0753
0042
0001
A
1000
8700
6540
4321
A
Lower and upper triangular matrices
Some elementary types of matrices
1000
0700
0040
0001
A
The diagonal matrix is a square and symmetrical.
1000
0100
0010
0001
A
Unit matrix I 3Λ is a matrix with one row and one column. It is a scalar (ordinary number).
Matrix operations
1 2 3 2 4 0 2 8 1 5 14 4
2 2 4 1 2 0 7 5 5 10 9 9A
3 5 7 6 9 1 0 0 1 9 14 9
3 1 0 1 1 4 5 6 1 9 8 5
Addition and Subtraction
Addition and subtraction are only defined for matrices with identical dimensions
nmnmnn
mm
baba
baba
......
............
............
......
11
111111
BA
S-product1 2 3 1 2 3 1 2 3 3 6 9 1 2 3 3 1 3 2 3 3
2 2 4 2 2 4 2 2 4 6 6 12 2 2 4 3 2 3 2 3 4A 3
3 5 7 3 5 7 3 5 7 9 15 21 3 5 7 3 3 3 5 3 7
3 1 0 3 1 0 3 1 0 9 3 0 3 1 0 3 3 3 1 3 0
A B B A 1B A
A B B A
A (B C) (A B) C
A A
(A B) A B
A( ) A A
BB
nmn
m
bb
bb
......
............
............
......
1
111
The inner or dot or scalar product
Assume you have production data (in tons) of winter wheat (15 t), summer wheat (20 t), and barley (30 t). In the next year weather condition reduced the winter wheat production
by 20%, the summer wheat production by 10% and the barley production by 30%. How many tons do you get the next year?
(15*0.8 + 20* 0.9 + 30 * 0.7) t = 51 t.
0.8
P 15 20 30 0.9 15*0.8 20*0.9 30*0.7 51
0.7
1 n
1 n i ii 1
n
b
A B a ... a ... a b scalar
b
The dot product is only defined for matrices, where the number of columns in the first matrix equals the number of rows in the second matrix.
We add another year and ask how many cereals we get if the second year is good and gives 10 % more of winter wheat, 20 % more of summer wheat and 25 % more of barley. For
both years we start counting with the original data and get a vector with one row that is the result of a two step process
0.8 1.1
P 15 20 30 0.9 1.2 15*0.8 20*0.9 30*0.7 15*1.1 20*1.2 30*1.25 51 78
0.7 1.25
m m
1i i1 1i iki 1 i 111 1m 11 1k 1 1 1 k
m mn1 nm m1 mk m 1 m k
ni i1 ni iki 1 i 1
a b ... a ba ... a b ... b A B ... A B
A B ... ... ... ... ... ... ... ... ... ... ... ...
a ... a a ... a A B ... A Ba b ... a b
A B B A
(A B) C A (B C) A B C
(A B) C A C B C
ikjkij CBA
izyzlmkljkij CZDCBA ...
4039
2021
3029
44
33
21
12
5432
1234
4321
402030
392129
514
423
332
421
*4321
4312
Transpose A’ ot AT
mnn
mT
mnm
n
aa
aa
aa
aa
...
.........
.........
...
......
............
......
1
111
1
111
394
483
56.312
141459.3171828.21
3456.314159.3
981171828.2
4321T
BA TT AB
TTT ABBA )(
Matrix add in for Excel:www.digilander.libero.it/foxes/SoftwareDownload.htm
Species wros wron wil ter swi sos mil lipPterostichus nigrita (Paykull) 0 2 61 53 0 18 39 2Platynus assimilis (Paykull) 0 0 1 0 0 9 0 117Amara brunea (Gyllenhal) 1 1 0 0 19 40 0 1Agonum lugens (Duftshmid) 1 1 2 2 0 0 0 0Loricera pilicornis (Fabricius) 0 0 1 0 0 0 3 0Pterostichus vernalis (Panzer) 1 1 21 2 0 1 7 0Amara plebeja (Gyllenhal) 0 0 0 0 1 2 0 4Badister unipustulatus Bonelli 0 0 0 0 4 1 0 3Lasoitrechus discus (Fabricius) 0 0 0 1 0 0 1 0Poecilus cupreus (Linnaeus) 0 0 0 0 0 2 0 0Amara aulica (Panzer) 0 1 0 0 0 0 0 0Anisodatylus binotatus (Fabricius) 0 0 0 0 0 0 2 0Bembidion articulatum (Panzer) 0 0 0 0 0 0 1 0Clivina collaris (Herbst) 0 0 0 0 0 0 2 0
Ground beetles on Mazurian lake islands (Mamry)
Photo Marek Ostrowski
Carabus auratus Carabus problematicus
Species wros wron wil ter swi sos mil lipPterostichus nigrita (Paykull) 0 2 61 53 0 18 39 2Platynus assimilis (Paykull) 0 0 1 0 0 9 0 117Amara brunea (Gyllenhal) 1 1 0 0 19 40 0 1Agonum lugens (Duftshmid) 1 1 2 2 0 0 0 0Loricera pilicornis (Fabricius) 0 0 1 0 0 0 3 0Pterostichus vernalis (Panzer) 1 1 21 2 0 1 7 0Amara plebeja (Gyllenhal) 0 0 0 0 1 2 0 4Badister unipustulatus Bonelli 0 0 0 0 4 1 0 3Lasoitrechus discus (Fabricius) 0 0 0 1 0 0 1 0Poecilus cupreus (Linnaeus) 0 0 0 0 0 2 0 0Amara aulica (Panzer) 0 1 0 0 0 0 0 0Anisodatylus binotatus (Fabricius) 0 0 0 0 0 0 2 0Bembidion articulatum (Panzer) 0 0 0 0 0 0 1 0Clivina collaris (Herbst) 0 0 0 0 0 0 2 0
Panagaeus cruxmajor (Linnaeus) 0 24 0 0 1 0 5 1Poecilus versicolor (Sturm) 0 0 0 0 0 0 0 2Pterostichus gracilis Dejean) 0 0 0 0 0 0 0 0Stenolophus mixtus 0 0 0 1 0 0 0 0Pseudoophonus rufipes (De Geer) 0 0 13 0 0 5 3 2Harpalus latus (Linnaeus) 0 0 0 0 0 3 0 2Agonum duftshmidi Shmidt 0 0 1 0 0 0 0 0Harpalus solitaris Dejean 0 0 0 0 1 0 1 0
Species associations
S
Panagaeus cruxmajor (Linnaeus)
Poecilus versicolor (Sturm)
Pterostichus gracilis Dejean)
Stenolophus mixtus
Pseudoophonus rufipes (De Geer)
Harpalus latus (Linnaeus)
Agonum duftshmidi Shmidt
Harpalus solitaris Dejean
wros 0 0 0 0 0 0 0 0wron 24 0 0 0 0 0 0 0wil 0 0 0 0 13 0 1 0ter 0 0 0 1 0 0 0 0swi 1 0 0 0 0 0 0 1sos 0 0 0 0 5 3 0 0mil 5 0 0 0 3 0 0 1lip 1 2 0 0 2 2 0 0
Species wros wron wil ter swi sos mil lipPterostichus nigrita (Paykull) 0 2 61 53 0 18 39 2Platynus assimilis (Paykull) 0 0 1 0 0 9 0 117Amara brunea (Gyllenhal) 1 1 0 0 19 40 0 1Agonum lugens (Duftshmid) 1 1 2 2 0 0 0 0Loricera pilicornis (Fabricius) 0 0 1 0 0 0 3 0Pterostichus vernalis (Panzer) 1 1 21 2 0 1 7 0Amara plebeja (Gyllenhal) 0 0 0 0 1 2 0 4Badister unipustulatus Bonelli 0 0 0 0 4 1 0 3Lasoitrechus discus (Fabricius) 0 0 0 1 0 0 1 0Poecilus cupreus (Linnaeus) 0 0 0 0 0 2 0 0Amara aulica (Panzer) 0 1 0 0 0 0 0 0Anisodatylus binotatus (Fabricius) 0 0 0 0 0 0 2 0Bembidion articulatum (Panzer) 0 0 0 0 0 0 1 0Clivina collaris (Herbst) 0 0 0 0 0 0 2 0
Species
Panagaeus cruxmajor (Linnaeus)
Poecilus versicolor (Sturm)
Pterostichus gracilis Dejean)
Stenolophus mixtus
Pseudoophonus rufipes (De Geer)
Harpalus latus (Linnaeus)
Agonum duftshmidi Shmidt
Harpalus solitaris Dejean
Pterostichus nigrita (Paykull) 245 4 0 53 1004 58 61 39Platynus assimilis (Paykull) 117 234 0 0 292 261 1 0Amara brunea (Gyllenhal) 44 2 0 0 202 122 0 19Agonum lugens (Duftshmid) 24 0 0 2 26 0 2 0Loricera pilicornis (Fabricius) 15 0 0 0 22 0 1 3Pterostichus vernalis (Panzer) 59 0 0 2 299 3 21 7Amara plebeja (Gyllenhal) 5 8 0 0 18 14 0 1Badister unipustulatus Bonelli 7 6 0 0 11 9 0 4Lasoitrechus discus (Fabricius) 5 0 0 1 3 0 0 1Poecilus cupreus (Linnaeus) 0 0 0 0 10 6 0 0Amara aulica (Panzer) 24 0 0 0 0 0 0 0Anisodatylus binotatus (Fabricius) 10 0 0 0 6 0 0 2Bembidion articulatum (Panzer) 5 0 0 0 3 0 0 1Clivina collaris (Herbst) 10 0 0 0 6 0 0 2
Assume you are studying a contagious disease. You identified as small group of 4 persons infected by the disease.
These 4 persons contacted in a given time with another group of 5 persons. The latter 5 persons had contact with other persons, say with 6, and so on. How often did a person
of group C indirectly contact with a person of group A?
0010
1000
1001
0010
1101
A
A1 2 3 4
B
12345
00010
00010
11000
11000
00010
10001
B
B1 2 3 4 5
C
123456
0010
0010
1010
1010
0010
1111
0010
1000
1001
0010
1101
00010
00010
11000
11000
00010
10001
ABC
A1 2 3 4
C
123456
We eliminate group B and leave the first and last group.
No. 1 of group C indirectly contacted with all members of group A.No. 2 of group A indirectly contacted with all six persons of group C.
23322221 11 SOaOFeaOFeSa
32
31
21
2322
2
2
aa
aa
aa
22230
002
002
321
321
321
aaa
aaa
aaa
22
0
0
230
102
021
3
2
1
a
a
a
Lecture 4
The Gauß scheme A linear system of equations
22230
002
002
3121
3321
3221
aaaa
aaaa
aaaa
Matrix algebra deals essentially with linear linear systems.
Multiplicative elements.A non-linear system
Solving simple stoichiometric equations
nnaaaaa uuuux ...3322110
2
1
222121
212111
2
1
2221
1211 ;
c
c
baba
baba
b
b
aa
aa
CBA
BA
2221
1211
2
1
2
1 /aa
aa
b
b
c
c
BC
2221212
2121111
babac
babac
The division through a vector or a matrix is not defined!
2 equations and four unknowns
230
102
021
/
22
0
0
3
2
1
a
a
a
Solving a linear system
22
0
0
230
102
021
3
2
1
a
a
a
For a non-singular square matrix the inverse is defined as
IAA
IAA
1
1
987
642
321
A
1296
654
321
A
r2=2r1 r3=2r1+r2
Singular matrices are those where some rows or columns can be expressed by a linear
combination of others.Such columns or rows do not contain additional
information.They are redundant.
nnkkkk VVVVV ...332211
A linear combination of vectors
A matrix is singular if it’s determinant is zero.
122122112221
1211
2221
1211
aaaaaa
aaDet
aa
aa
AA
A
Det A: determinant of AA matrix is singular if at least one of the parameters k is not zero.
1112
2122
21122211
1
2212
2111
1aa
aa
aaaa
aa
aa
A
A
(A•B)-1 = B-1 •A-1 ≠ A-1 •B-1
nn
nn
a
a
a
a
a
a
1...00
............
0...1
0
0...01
...00
............
0...0
0...0
22
11
1
22
11
A
A
Determinant
The inverse of a 2x2 matrix The inverse of a diagonal matrix
The inverse of a square matrix only exists if its determinant differs from zero.
Singular matrices do not have an inverse
The inverse can be unequivocally calculated by the Gauss-Jordan algorithm
The Nine Chapters on the Mathematical Art.(1000BC-100AD). Systems of linear equations, Gaussian elimination
22
0
0
230
102
021
230
102
021
230
102
0211
3
2
1
3
2
1
3
2
1
1
a
a
a
a
a
a
a
a
a
I
Solving a simple linear system
23222 82114 SOOFeOFeS
23322221 11 SOaOFeaOFeSa
BAX
IAA
BAAXABAX
1
1
11
XXIIX
I
1...00
............
0...10
0...01
Identity matrix
Only possible if A is not singular.If A is singular the system has no solution.
The general solution of a linear system
13.25.09
12833
10423
zyx
zyx
zyxSystems with a unique solution
The number of independent equations equals the number of unknowns.
3.25.09
833
423
13.25.09
12833
10423
X: Not singular The augmented matrix Xaug is not singular and has the same rank as X.
The rank of a matrix is minimum number of rows/columns of the largest non-singular submatrix
0678.0
5627.4
3819.0
1
12
10
3.25.09
833
4231
z
y
x
1 2 3 4 1
1 2 3 4 2
31 2 3 4
41 2 3 4
1 2 3 4
1 2 3 4
1 2 3
2x 6x 5x 9x 10 x2 6 5 9 10
2x 5x 6x 7x 12 x2 5 6 7 12
x4x 4x 7x 6x 14 4 4 7 6 14
5 3 8 5 16x5x 3x 8x 5x 16
2x 3x 4x 5x 10
4x 6x 8x 10x 20
4x 5x 6x
1
2
34
41 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
x2 3 4 5 10
x4 6 8 10 20
x7x 14 4 5 6 7 14
5 6 7 8 16x5x 6x 7x 8x 16
2x 3x 4x 5x 10 2 3 4 5
4x 6x 8x 10x 12 4 6 8 10
4x 5x 6x 7x 14 4 5 6 7
5 6 75x 6x 7x 8x 16
1
2
3
4
11 2 3 4
21 2 3 4
31 2 3 4
4
1 2 3 4
1
x 10
x 12
x 14
8 16x
x2x 3x 6x 9x 10 2 3 6 9 10
x2x 4x 5x 6x 12 2 4 5 6 12
x4 5 4 7 144x 5x 4x 7x 14
x
2x 3x 4x 5x 10
4x
1
2 3 42
1 2 3 43
1 2 3 44
1 2 3 4
1 2 3 4
1 2
102 3 4 5x
6x 8x 10x 12 124 6 8 10x
4x 5x 6x 7x 14 144 5 6 7x
165 6 7 85x 6x 7x 8x 16x
1610 12 14 1610x 12x 14x 16x 16
2x 3x 4x 5x 10
4x 6x 8
1
3 42
1 2 3 43
1 2 3 44
1 2 3 4
102 3 4 5x
x 10x 12 124 6 8 10x
4x 5x 6x 7x 14 144 5 6 7x
165 6 7 85x 6x 7x 8x 16x
3210 12 14 1610x 12x 14x 16x 32
Consistent
Rank(A) = rank(A:B) = n
Consistent
Rank(A) = rank(A:B) < n
Inconsistent
Rank(A) < rank(A:B)
Consistent
Rank(A) = rank(A:B) < n
Inconsistent
Rank(A) < rank(A:B)
Consistent
Rank(A) = rank(A:B) = n
Infinite number of solutions
No solution
Infinite number of solutions
No solution
Infinite number of solutions
The transition matrix
Assume a gene with four different alleles. Each allele can mutate into anther allele.The mutation probabilities can be measured.
991.0003.0002.0001.0
004.0995.0003.0001.0
004.0001.0994.0001.0
001.0001.0001.0997.0
A→A B→A C→A D→A
Sum 1 1 11
Transition matrixProbability matrix
1.0
3.0
2.0
4.0
Initial allele frequencies
What are the frequencies in the next generation?
A→A
A→B
A→C
A→D
1008.0991.0*1.0003.0*3.0002.0*2.0001.0*4.0)1(
2999.0004.0*1.0995.0*3.0003.0*2.0001.0*4.0)1(
1999.0004.0*1.0001.0*3.0994.0*2.0001.0*4.0)1(
3994.0001.0*1.0001.0*3.0001.0*2.0997.0*4.0)1(
tD
tC
tB
tA
)(
)(
)(
)(
991.0003.0002.0001.0
004.0995.0003.0001.0
004.0001.0994.0001.0
001.0001.0001.0997.0
)1(
)1(
)1(
)1(
tD
tC
tB
tA
tD
tC
tB
tA
Σ = 1
The frequencies at time t+1 do only depent on the frequencies at time t but not on earlier ones.Markov process
)()1( tt PFF
A B C D EigenvaluesA 0.997 0.001 0.001 0.001 0.988697B 0.001 0.994 0.001 0.004 0.992303C 0.001 0.003 0.995 0.004 0.996D 0.001 0.002 0.003 0.991 1
Eigenvectors0 0 0.842927 0.48866
0.555069 0.780106 -0.18732 0.438110.241044 -0.5988 -0.46829 0.65716-0.79611 -0.1813 -0.18732 0.3707
)(
)(
)(
)(
991.0003.0002.0001.0
004.0995.0003.0001.0
004.0001.0994.0001.0
001.0001.0001.0997.0
)(
)(
)(
)(
)1(
)1(
)1(
)1(
tD
tC
tB
tA
tD
tC
tB
tA
tD
tC
tB
tA
Does the mutation process result in stable allele frequencies?
NAN Stable state vectorEigenvector of A
0)(
0
NIA
NAN
NAN
Eigenvalue Unit matrix Eigenvector
The largest eigenvalue defines the stable state vector
Every probability matrix has at least one eigenvalue = 1.
gfNN
The insulin – glycogen systemAt high blood glucose levels insulin stimulates glycogen synthesis and inhibits
glycogen breakdown.
The change in glycogen concentration DN can be modelled by the sum of constant production g and concentration
dependent breakdown fN.
01
0
g
fN
NgfN
At equilibrium we have
010
011
0
0
01
1
00111
2
2
2
2
g
f
N
N
g
f
N
N
Ng
fNN TT
The vector {-f,g} is the stationary state vector (the largest eigenvector) of the dispersion matrix and
gives the equilibrium conditions (stationary point).
The value -1 is the eigenvalue of this system.
1
12
2
N
ND
The symmetric and square matrix D that contains squared values is called the dispersion matrix
The glycogen concentration at equilibrium:
fg
Nequi The equilbrium concentration does not depend on the initial concentrations
A matrix with n columns has n eigenvalues and n eigenvectors.
Some properties of eigenvectors
11
UUAAUUUΛAU
UΛΛU
If L is the diagonal matrix of eigenvalues:
The product of all eigenvalues equals the
determinant of a matrix.
n
i i1det A
The determinant is zero if at least one of the eigenvalues is zero.
In this case the matrix is singular.
The eigenvectors of symmetric matrices are orthogonal
0'
:)(
UUA symmetric
Eigenvectors do not change after a matrix is multiplied by a scalar k.
Eigenvalues are also multiplied by k.
0][][ uIkkAuIA
If A is trianagular or diagonal the eigenvalues of A are the diagonal
entries of A.A Eigenvalues
2 3 -1 3 23 2 -6 3
4 -5 45 5
Page Rank
Google sorts internet pages according to a ranking of websites based on the probablitites to be directled to this page.
Assume a surfer clicks with probability d to a certain website A. Having N sites in the world (30 to 50 bilion) the probability to reach A is d/N.Assume further we have four site A, B, C, D, with links to A. Assume further the four sites have cA, cB, cC, and cD links and kA, kB, kC, and kD links to A. If the probability to be on one of these sites is pA, pB, pC, and pD, the probability to reach A from any of the sites is therefore
D
ADD
C
ACC
B
ABBA c
dkp
c
dkp
c
dkpp
d
d
d
d
N
p
p
p
p
cdkcdkcdk
cdkcdkcdk
cdkcdkcdk
cdkcdkcdk
D
C
B
A
CDCBDBADA
DCDCBBACA
DBDCBCABA
DADCACBAB
1
1///
/1//
//1/
///1
Google uses a fixed value of d=0.15. Needed is the number of links per website.
Probability matrix P Rank vector u
Internet pages are ranked according to probability to be reached
C
CC
B
BB
A
AAD
D
DD
B
BB
A
AAC
D
DD
C
CC
A
AAB
D
DD
C
CC
B
BBA
cdk
pcdk
pcdk
pNd
p
cdk
pcdk
pcdk
pNd
p
cdk
pcdk
pcdk
pNd
p
cdk
pcdk
pcdk
pNd
p
The total probability to reach A is
D
ADD
C
ACC
B
ABBA c
dkp
c
dkp
c
dkpp
D
ADD
C
ACC
B
ABBA c
dkp
c
dkp
c
dkp
N
dp
15.0
15.0
15.0
15.0
41
1000
075.0115.00
075.015.0115.0
0001
D
C
B
A
p
p
p
p
PA 1 0 0 0 0.0375B -0.15 1 -0.15 -0.075 0.0375C 0 -0.15 1 -0.075 0.0375D 0 0 0 1 0.0375
P-1
1 0 0 0 A 0.03750.153453 1.023018 0.153453 0.088235 B 0.0531810.023018 0.153453 1.023018 0.088235 C 0.04829
0 0 0 1 D 0.0375
A B
C D
Larry Page (1973-
Sergej Brin (1973-
Page Rank as an eigenvector problem
15.0
15.0
15.0
15.0
41
1000
075.0115.00
075.015.0115.0
0001
D
C
B
A
p
p
p
p In reality the constant is very small
0
1000
0100
0010
0001
0000
075.0015.00
075.015.0015.0
0000
0
1000
075.0115.00
075.015.0115.0
0001
D
C
B
A
D
C
B
A
p
p
p
p
p
p
p
p
The final page rank is given by the stationary state vector (the vector of the largest eigenvalue).
A B C D EigenvaluesA 0 0 0 0 -0.15 0B -0.15 0 -0.15 -0.075 0 0C 0 -0.15 0 -0.075 0 0D 0 0 0 0 0.15 0
Eigenvectors0 0.707107 0.408248 0
0.707107 0 0.408248 0.707110.707107 -0.70711 0 -0.7071
0 0 -0.8165 0
Home work and literatureRefresh:
• Vectors• Vector operations (sum, S-product, scalar product)• Scalar product of orthogonal vectors• Distance metrics (Euclidean, Manhattan, Minkowski)• Cartesian system, orthogonal vectors• Matrix• Types of matrices• Basic matrix operations (sum, S-product, dot product)
Prepare to the next lecture:
• Linear equations• Inverse• Stochiometric equations
Literature:
Mathe-onlineStoichiometric equations: http://sciencesoft.at/equation/index?lang=enStoichiometry: http://en.wikipedia.org/wiki/Stoichiometry