plz give me a solution
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Write a function called large_elements that takes as input an array named X that is a matrix or a vector. The function identifies those elements of X that are greater than the sum of their two indexes. For example, if the element X(2,3) is 6, then that element would be identified because 6 is greater than 2 + 3. The output of the function gives the indexes of such elements found in row-‐ major order. It is a matrix with exactly two columns. The first column contains the row indexes, while the second column contains the corresponding column indexes. For example, the statement indexes = large_elements([1 4; 5 2; 6 0], will make indexes equal to [1 2; 2 1; 3 1]. If no such element exists, the function returns an empty array.
function found = large_elements(A)
[row col] = size(A);
found = [];
for ii = 1:row
for jj = 1:col
if A(ii,jj) > ii + jj
found = [found; ii jj];
else found = [];
end
end
end
end
Problem 4 (large_elements): Feedback: Your function performed correctly for argument(s) 1
Feedback: Your function performed correctly for argument(s) [1 2 3 4 5 6 7 8 9 10]
Feedback: Your function made an error for argument(s) [10 9 8 7 6 5 4 3 2 1]
Your solution is _not_ correct.
4 个评论
Walter Roberson
2015-5-30
Do not tag individuals.
Jyoti Sharma
2017-7-5
编辑：Jyoti Sharma
2017-7-5
My code worked. I think you should remove the else statement. Try this:
function y = small_elements(v)
[r,c] = size(v);
n=0;
y = [];
for j = 1:c
for i = 1:r
if v(i,j) < i*j;
n = n+1;
y = [y; i j];
end
end
end
Walter Roberson
2017-7-5
Jyoti, that is what I suggested two years ago.
grooshka
2018-4-16
What is the purpose of n variable?
采纳的回答
Walter Roberson
2015-5-30
0 个投票
In the "else" case, leave found unchanged instead of overwriting all of it with [].
2 个评论
Edward Kofi Mahama
2017-11-11
Please why did you add " n=0" and "n = n+1" to the code. I don't understand why the code should not work without that. Can you please help explain? Thanks in advance
Walter Roberson
2017-11-11
Jyoti Sharma added the counter. I do not know why.
There is another way of writing the code that does use a counter:
function y = small_elements(v)
[r,c] = size(v);
n=0;
y = [];
for j = 1:c
for i = 1:r
if v(i,j) < i*j;
n = n+1;
y(n,:) = [i j];
end
end
end
更多回答（1 个）
Jorge Alberto Fuentes Casillas
2017-4-18
编辑：Walter Roberson
2017-4-18
This code is for this case: "Write a function called small_elements that takes as input an array named X that is a matrix or a vector...."
function indexes = small_elements(v)
[i j] = size(v);
position = 0;
indexes_rows = [];
indexes_columns = [];
if ~isempty(v)
for columns = 1:j
for rows = 1:i
elem_in_i = v(rows,columns);
product_ij = rows*columns;
if elem_in_i<product_ij
position = position+1;
indexes_rows(position) = (rows);
indexes_columns(position) = (columns);
end
end
end
if isempty(indexes_rows) || isempty(indexes_columns)
indexes = [];
else
indexes = [indexes_rows',indexes_columns']; % A matrix of only 2 columns is created.
end
else
indexes = [];
end
end
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