Eye command with a matrix

2013 2 20
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Use the eye command to create the array A shown on the left below. Then use the
colon to address elements in the arrays and the eye command to change A to match the array
shown on the right.
http://i49.tinypic.com/20go38i.jpg
So far I have tried
A=eye(7,7)
A=[2,2,2,0,5,5,5;2,2,2,0,5,5,5;3,3,3,0,5,5,5;0,0,0,1,0,0,0;4,4,7,0,9,9,9;4,4,7,0,9,9,9;4,4,7,0,9,9,9]
to match the array i did
B=[A eye(7,0)]

7 个评论
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Image Analyst
Image Analyst 2013-2-20
编辑：Image Analyst 2013-2-20
So? What's wrong with that? It produces the "A" array you want. Do you have a question? I'm not sure what B is for.
marie
marie 2013-2-20
because it asks to use the colon to address elements in the arrays I'm not sure if A=[2,2,2,0,5,5,5;2,2,2,0,5,5,5;3,3,3,0,5,5,5;0,0,0,1,0,0,0;4,4,7,0,9,9,9;4,4,7,0,9,9,9;4,4,7,0,9,9,9] is right
and the B is just to give the new array a name
Sean de Wolski
Sean de Wolski 2013-2-20
I don't see any correlation between an identity matrix and that matrix B.
If you need to use colon:
I = eye(7);
I(1:2,1:3) = 2;
I(1:2,5:7) = 5;
etc. until it's filled up.
Youssef Khmou
Youssef Khmou 2013-2-20
its right, are you sure its "eye" not "ones " ?
marie
marie 2013-2-20
编辑：marie 2013-2-20
when I do I(:3,1:3) = 3 it gives me an error did i use the wrong command?
Santosh
Santosh 2013-2-20
colon is a vectorization operator whose usage is m:n. :3 here is not correct.
marie
marie 2013-2-20
I got it thank you!

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marie
marie
2013-2-20

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