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|00000000| 5c 73 65 63 74 69 6f 6e | 7b 65 79 65 20 2d 2d 2d |\section|{eye ---|
|00000010| 20 49 64 65 6e 74 69 74 | 79 20 6d 61 74 72 69 78 | Identit|y matrix|
|00000020| 7d 0d 5c 6c 61 62 65 6c | 7b 66 6e 3a 65 79 65 7d |}.\label|{fn:eye}|
|00000030| 0d 5c 69 6e 64 65 78 7b | 65 79 65 28 29 7d 0d 5c |.\index{|eye()}.\|
|00000040| 69 6e 64 65 78 7b 6d 61 | 74 72 69 78 21 69 64 65 |index{ma|trix!ide|
|00000050| 6e 74 69 74 79 7d 0d 5c | 69 6e 64 65 78 7b 69 64 |ntity}.\|index{id|
|00000060| 65 6e 74 69 74 79 20 6d | 61 74 72 69 78 7d 0d 5c |entity m|atrix}.\|
|00000070| 62 65 67 69 6e 7b 72 61 | 69 6c 7d 0d 49 64 65 6e |begin{ra|il}.Iden|
|00000080| 74 69 74 79 20 3a 20 27 | 65 79 65 27 20 27 28 27 |tity : '|eye' '('|
|00000090| 20 28 20 28 53 63 61 6c | 61 72 20 27 2c 27 20 53 | ( (Scal|ar ',' S|
|000000a0| 63 61 6c 61 72 29 20 7c | 20 4d 61 74 72 69 78 29 |calar) || Matrix)|
|000000b0| 20 20 27 29 27 20 3b 0d | 5c 65 6e 64 7b 72 61 69 | ')' ;.|\end{rai|
|000000c0| 6c 7d 0d 0d 5c 76 65 72 | 62 2b 65 79 65 2b 20 67 |l}..\ver|b+eye+ g|
|000000d0| 65 6e 65 72 61 74 65 73 | 20 61 6e 20 69 64 65 6e |enerates| an iden|
|000000e0| 74 69 74 79 20 6d 61 74 | 72 69 78 2e 20 54 68 69 |tity mat|rix. Thi|
|000000f0| 73 20 69 73 20 61 20 6d | 61 74 72 69 78 20 77 69 |s is a m|atrix wi|
|00000100| 74 68 20 65 61 63 68 0d | 65 6c 65 6d 65 6e 74 20 |th each.|element |
|00000110| 6f 6e 20 74 68 65 20 6d | 61 69 6e 20 64 69 61 67 |on the m|ain diag|
|00000120| 6f 6e 61 6c 20 73 65 74 | 20 74 6f 20 24 31 24 20 |onal set| to $1$ |
|00000130| 61 6e 64 20 61 6c 6c 20 | 6f 74 68 65 72 20 65 6c |and all |other el|
|00000140| 65 6d 65 6e 74 73 20 73 | 65 74 20 74 6f 0d 24 30 |ements s|et to.$0|
|00000150| 24 2e 20 49 66 20 74 68 | 65 20 61 72 67 75 6d 65 |$. If th|e argume|
|00000160| 6e 74 73 20 61 72 65 20 | 74 77 6f 20 73 63 61 6c |nts are |two scal|
|00000170| 61 72 73 2c 20 74 68 65 | 20 66 69 72 73 74 20 73 |ars, the| first s|
|00000180| 70 65 63 69 66 69 65 73 | 20 74 68 65 20 6e 75 6d |pecifies| the num|
|00000190| 62 65 72 0d 6f 66 20 72 | 6f 77 73 20 61 6e 64 20 |ber.of r|ows and |
|000001a0| 74 68 65 20 73 65 63 6f | 6e 64 20 73 70 65 63 69 |the seco|nd speci|
|000001b0| 66 69 65 73 20 74 68 65 | 20 6e 75 6d 62 65 72 20 |fies the| number |
|000001c0| 6f 66 20 63 6f 6c 75 6d | 6e 73 20 69 6e 20 74 68 |of colum|ns in th|
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|000001e0| 74 68 65 20 61 72 67 75 | 6d 65 6e 74 20 69 73 20 |the argu|ment is |
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|00000200| 74 20 6d 75 73 74 20 68 | 61 76 65 20 74 77 6f 20 |t must h|ave two |
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|00000220| 68 65 0d 66 69 72 73 74 | 20 65 6c 65 6d 65 6e 74 |he.first| element|
|00000230| 20 73 70 65 63 69 66 79 | 69 6e 67 20 74 68 65 20 | specify|ing the |
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|00000250| 61 6e 64 20 74 68 65 20 | 73 65 63 6f 6e 64 20 65 |and the |second e|
|00000260| 6c 65 6d 65 6e 74 20 0d | 73 70 65 63 69 66 79 69 |lement .|specifyi|
|00000270| 6e 67 20 74 68 65 20 6e | 75 6d 62 65 72 20 6f 66 |ng the n|umber of|
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|00000290| 72 65 73 75 6c 74 2e 0d | 0d 24 5c 4c 6f 6e 67 72 |result..|.$\Longr|
|000002a0| 69 67 68 74 61 72 72 6f | 77 24 20 54 68 69 73 20 |ightarro|w$ This |
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|000002f0| 6f 61 64 65 64 20 6f 6e | 20 73 74 61 72 74 2d 75 |oaded on| start-u|
|00000300| 70 20 66 72 6f 6d 20 74 | 68 65 20 5c 76 65 72 62 |p from t|he \verb|
|00000310| 2b 65 79 65 2e 72 2b 20 | 66 69 6c 65 20 69 6e 20 |+eye.r+ |file in |
|00000320| 74 68 65 0d 73 74 61 6e | 64 61 72 64 20 5c 76 65 |the.stan|dard \ve|
|00000330| 72 62 2b 72 6c 69 62 2b | 20 64 69 72 65 63 74 6f |rb+rlib+| directo|
|00000340| 72 79 2e 20 55 73 65 20 | 6f 66 20 74 68 65 20 5c |ry. Use |of the \|
|00000350| 76 65 72 62 2b 2d 72 2b | 20 6f 70 74 69 6f 6e 2c |verb+-r+| option,|
|00000360| 20 69 6e 63 6f 72 72 65 | 63 74 6c 79 20 0d 73 65 | incorre|ctly .se|
|00000370| 74 74 69 6e 67 20 74 68 | 65 20 5c 76 65 72 62 2b |tting th|e \verb+|
|00000380| 52 4c 41 42 5f 4c 49 42 | 5f 44 49 52 2b 20 65 6e |RLAB_LIB|_DIR+ en|
|00000390| 76 69 72 6f 6e 6d 65 6e | 74 61 6c 20 76 61 72 69 |vironmen|tal vari|
|000003a0| 61 62 6c 65 2c 20 6f 72 | 20 6d 6f 64 69 66 79 69 |able, or| modifyi|
|000003b0| 6e 67 0d 5c 76 65 72 62 | 2b 65 79 65 2e 72 2b 20 |ng.\verb|+eye.r+ |
|000003c0| 6d 61 79 20 6d 61 6b 65 | 20 74 68 69 73 20 66 75 |may make| this fu|
|000003d0| 6e 63 74 69 6f 6e 20 75 | 6e 61 76 61 69 6c 61 62 |nction u|navailab|
|000003e0| 6c 65 2e 0d 0d 5c 70 61 | 72 61 67 72 61 70 68 7b |le...\pa|ragraph{|
|000003f0| 45 78 61 6d 70 6c 65 7d | 0d 5c 69 6e 64 65 78 7b |Example}|.\index{|
|00000400| 65 78 61 6d 70 6c 65 20 | 6f 66 20 65 79 65 28 29 |example |of eye()|
|00000410| 7d 0d 5c 69 6e 64 65 78 | 7b 65 79 65 28 29 21 65 |}.\index|{eye()!e|
|00000420| 78 61 6d 70 6c 65 7d 0d | 5c 62 65 67 69 6e 7b 76 |xample}.|\begin{v|
|00000430| 65 72 62 61 74 69 6d 7d | 0d 3e 20 65 79 65 28 33 |erbatim}|.> eye(3|
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|00000490| 30 20 20 20 20 20 20 20 | 20 20 20 30 20 20 20 20 |0 | 0 |
|000004a0| 20 20 20 20 20 20 31 20 | 20 0d 3e 20 65 79 65 28 | 1 | .> eye(|
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|00000510| 20 20 20 20 20 20 30 20 | 20 20 20 20 20 20 20 20 | 0 | |
|00000520| 20 30 20 20 0d 3e 20 65 | 79 65 28 5b 33 2c 34 5d | 0 .> e|ye([3,4]|
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|000005c0| 61 6e 64 28 32 2c 34 29 | 0d 20 63 20 3d 0d 20 20 |and(2,4)|. c =. |
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|00000610| 20 20 20 20 20 30 2e 34 | 39 34 20 20 20 20 20 20 | 0.4|94 |
|00000620| 30 2e 33 32 34 20 20 0d | 3e 20 65 79 65 28 73 69 |0.324 .|> eye(si|
|00000630| 7a 65 28 63 29 29 0d 20 | 20 20 20 20 20 20 20 31 |ze(c)). | 1|
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|00000690| 0d 5c 65 6e 64 7b 76 65 | 72 62 61 74 69 6d 7d 0d |.\end{ve|rbatim}.|
|000006a0| 0d 53 65 65 20 61 6c 73 | 6f 3a 20 50 61 67 65 7e |.See als|o: Page~|
|000006b0| 5c 70 61 67 65 72 65 66 | 7b 66 6e 3a 64 69 61 67 |\pageref|{fn:diag|
|000006c0| 7d 20 5c 76 65 72 62 2b | 64 69 61 67 28 29 2b 2c |} \verb+|diag()+,|
|000006d0| 0d 50 61 67 65 7e 5c 70 | 61 67 65 72 65 66 7b 66 |.Page~\p|ageref{f|
|000006e0| 6e 3a 6f 6e 65 73 7d 20 | 5c 76 65 72 62 2b 6f 6e |n:ones} |\verb+on|
|000006f0| 65 73 28 29 2b 2c 0d 50 | 61 67 65 7e 5c 70 61 67 |es()+,.P|age~\pag|
|00000700| 65 72 65 66 7b 66 6e 3a | 7a 65 72 6f 73 7d 20 5c |eref{fn:|zeros} \|
|00000710| 76 65 72 62 2b 7a 65 72 | 6f 73 28 29 2b 2e 0d 0d |verb+zer|os()+...|
|00000720| 0d 5c 6e 65 77 70 61 67 | 65 0d 0d 0d 0d 0d 0d 0d |.\newpag|e.......|
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