What is wrong with my code?
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Hi. I am trying to write a function that takes two inputs (N and n) and return a n by n array at the top right corner of N. So far i have:
function M = top_right(N,n)
M = N(1:n, 1:n);
回答（3 个）
Star Strider
2016-8-5
I’m not exactly certain what you want to do.
See if this works for you:
N = 6; % Argument
n = 3; % Argument
M = zeros(N); % Create ‘M’
M(1:n, N-n+1:N) = 1 % Set Top Right Corner To ‘1’
M =
M =
0 0 0 1 1 1
0 0 0 1 1 1
0 0 0 1 1 1
0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 0 0 0
4 个评论
Alexandra Huff
2016-8-5
Star Strider
2016-8-5
Another approach:
N = 6; % Argument
n = 3; % Argument
M = randi(99,N); % Create ‘M’
M(1:n, N-n+1:N) = rand(n) % Set Top Right Corner To ‘rand’
79 68 70 0.119 0.34039 0.75127
95 76 4 0.49836 0.58527 0.2551
65 74 28 0.95974 0.22381 0.50596
4 39 5 4 49 68
85 65 10 44 45 65
93 17 82 38 64 17
Alexandra Huff
2016-8-5
Star Strider
2016-8-5
I don’t see any way to do what you want without specifically defining ‘N’ and ‘n’ unless you do it randomly:
N = randi(8); % Argument
n = randi(N-2); % Argument
M = zeros(N); % Create ‘M’
M(1:n, N-n+1:N) = 1 % Set Top Right Corner To ‘1’
I’m keeping the matrices small for convenience. You can also define ‘n’ as:
n = randi(N-randi(N-1));
That way, you don’t have to define anything specifically, since all the parameters are random integers.
Azzi Abdelmalek
2016-8-5
idx=sub2ind(size(N),1:n, 1:n)
M=N(idx)
Walter Roberson
2016-8-5
编辑：Walter Roberson
2016-8-5
M = N(1:n, end-n+1:end);
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2016-8-5
2016-8-5
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