What is wrong with my code?

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Alexandra Huff 2016-8-5

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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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Answer 1

Star Strider 2016-8-5

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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 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 2016-8-5

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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’