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create a matrix with ones and zeros

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Tony Montgomery
Tony Montgomery 2014-9-6
评论： Tony Montgomery 2014-9-6
in need to create an array of 20-by-20 the first row needs to be 19 ones and 1 zero the first column is all ones the last row is is all ones from the first row first column diagnally to the last row last column needs to be filled with ones, the rest are all zero.
now I can type this all out but there must be a better way
my question is how do i create this array?

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Star Strider
Star Strider 2014-9-6
编辑：Star Strider 2014-9-6
This looks like what you want:
a = ones(1,20);
M = diag(a);
M(1,:) = [ones(1,19) 0];
M(:,1) = a';
M(20,:) = a;
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Star Strider
Star Strider 2014-9-6
My pleasure!
I just realised that I could have used ‘a’ in M(1:) as well:
M(1,:) = [a(1:19) 0];
Tony Montgomery
Tony Montgomery 2014-9-6
okay another problem close to the first.
need to create a similar array, but instead add variables.
so for example the last row need to be 19 of variable b and 1 one. how can i do that?

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