code vectorization: assign numbers or datetime/durations to cell arrays, without any loop
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Here following I am trying to assign numbers or datetime/durations to a cell array, without any loop.
In one case the result is correct (as expected), in other two cases the results are not correct.
How to fix the cases that do not give the correct result ?
Case 1 : the result is correct
a = cell(3,3);
index = [1 1
2 1];
a(index(:,1),index(:,2)) = {1}
Case 2 : the result is not correct
a = cell(3,3);
index = [1 1
2 1
3 3];
a(index(:,1),index(:,2)) = {1}
I woud have expected the following result, as the correct one:
{[ 1]} {0×0 double} {0×0 double}
{[ 1]} {0×0 double} {0×0 double}
{0×0 double} {0×0 double} {[ 1]}
Case 3 : the result is not correct
a = cell(3,3);
index = [1 1
2 1
3 3];
b = datetime({'00:01:35'
'00:01:11'
'00:04:21'});
a(index(:,1),index(:,2)) = {b}
I woud have expected the following result, as the correct one:
{'00:01:35'} {0×0 double} {0×0 double}
{'00:01:11'} {0×0 double} {0×0 double}
{0×0 double} {0×0 double} {'00:04:21'}
采纳的回答
Case 1:
a = cell(3,3);
index = [1 1
2 1];
idx = sub2ind(size(a),index(:,1),index(:,2));
a(idx) = {1}
Case 2:
a = cell(3,3);
index = [1 1
2 1
3 3];
idx = sub2ind(size(a),index(:,1),index(:,2));
a(idx) = {1}
Case 3:
a = cell(3,3);
index = [1 1
2 1
3 3];
b = datetime({'00:01:35'
'00:01:11'
'00:04:21'});
idx = sub2ind(size(a),index(:,1),index(:,2));
a(idx) = num2cell(b) % use num2cell to convert from datetime array to cell array
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