What is wrong with my code?

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Alexandra Huff
Alexandra Huff 2016-8-5
编辑： Walter Roberson 2016-8-5
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);

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回答（3 个）

Star Strider
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
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Alexandra Huff
Alexandra Huff 2016-8-5
The first way is what I want but I am trying to figure out how to do it without defining specifically what N and n is. Does that clarify what I am looking for better? So, I am trying to take two inputs N and n, where N's dimension is always greater than or equal to n. Then the function returns a n by n square array at the top right corner of N.
Star Strider
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.

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Azzi Abdelmalek
Azzi Abdelmalek 2016-8-5
idx=sub2ind(size(N),1:n, 1:n)
M=N(idx)
Walter Roberson
Walter Roberson 2016-8-5
编辑：Walter Roberson 2016-8-5
M = N(1:n, end-n+1:end);

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