Need help writing a matlab function.

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Peyton
Peyton 2024-11-17，2:47
回答： Walter Roberson 2024-11-17，3:27
Write a function called hw4_problem3 that takes a vector containing integers called w
and a scalar, n, as its input arguments. The function returns the first element found in w that are
larger than or equal to n. If there is no element in w that is larger than or equal to n, return -1.
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Peyton
Peyton 2024-11-17，3:10
Can i just get an answer because i got this far
function output = hw4_problem1(A)
% Check if the input A is a numeric matrix
if ~isnumeric([1, 2, 3; 4, 5, 6])
error('Input A must be a numeric matrix.');
end
% Check if the matrix A is empty
if isempty([1, 2, 3; 4, 5, 6])
error('Input A cannot be empty.');
end
% Get the number of rows and columns of A
[numRows, numCols] = size([1, 2, 3; 4, 5, 6]);
% Output matrix for storing results (just as an example here)
output = zeros(numRows, numCols);
% Loop over the rows of A
for i = 1:numRows
for j = 1:numCols
% Example operation: simply copy the elements of A to output
output(i = 1:numRows, j = 1:numCols) = A(2,2);
end
end
end
Peyton
Peyton 2024-11-17，3:13
cause i keep getting an error

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回答（2 个）

Image Analyst
Image Analyst 2024-11-17，3:17
Ran in:
Replace all your [1, 2, 3; 4, 5, 6] by A.
Replace
output = hw4_problem1(A)
by
output = hw4_problem1(A, n)
A is a vector, not a matrix so don't overcomplicate it by worrying about rows and columns.
Hint: Use find. For example
A = [1,4,9,2,4,0,8,-20]
A = 1×8
1 4 9 2 4 0 8 -20
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
firstIndex = find(A >= 3, 1, 'first')
firstIndex = 2
value = A(firstIndex) % Get first value more than n
value = 4
Please adapt this to your homework problem.
Walter Roberson
Walter Roberson 2024-11-17，3:27
A deliberately clumsy implementation:
function appropriate_element_to_return = hw4_problem3(w, n)
array_being_indexed = w;
value_to_compare_to = n;
found_it_at_location = nan;
for index_of_array = numel(w):-1:1
if array_being_indexed(index_of_array) >= value_to_compare_to
found_it_at_location = index_of_array;
end
end
if ~isfinite(found_it_at_location)
appropriate_element_to_return = -1;
else
appropriate_element_to_return = array_being_indexed(found_it_at_location);
end
end

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