How to append values to an array in for loop?

28 次查看（过去 30 天）
Atanu
Atanu 2022-5-5
评论： Atanu 2022-5-8
rotation_time_by_direction = [];
for i = 1:10:length(direction_table.rodent_RecordingTime)-10
direction_change = ones(1,10)';
for j = 1:10
direction_change(j,1) = abs(direction_table.direction(i,1)-direction_table.direction(i+j,1));
threshold_degree = 100;
if any(direction_change > threshold_degree)
rotation_time_by_direction = cat(1, rotation_time_by_direction, direction_table.rodent_RecordingTime(i));
end
end
end
I am trying append the rodent_RecordingTime values to rotation_time_by_direction array when rotation is more than 100 degrees over next 10 time steps. But I am not sure why the rodent_RecordingTime is appending to the array. I have attached the variables if you want to look at it. Any help is appreciated.
  2 个评论
Stephen23
Stephen23 2022-5-5
"But I am not sure why the rodent_RecordingTime is appending to the array."
cat(1, rotation_time_by_direction, direction_table.rodent_RecordingTime(i))
% ^^^^^^^^^^^^^^^^^^^^
Atanu
Atanu 2022-5-5
Sorry, I didn't get your comment. If you are asking what do I mean by "But I am not sure why the rodent_RecordingTime is appending to the array.", you can consider it redundant.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

dpb
dpb 2022-5-5
>> for i=1:10:height(direction_table)-10
dx=abs(direction_table.direction(i+1:i+9)-direction_table.direction(i));
ix=find(dx>100,1);
id=ix+i-1;
if any(ix), disp([direction_table{i,:} dx(ix)]),end
end
0 -5.1105 -465.77 -72.713 107.33
4 146.82 -398.22 -228.38 324.64
12 -126.12 -125.06 -378.62 102.2
13 -111.11 -120.79 -379.49 289.69
14 168.73 -118.5 -374.87 215.66
17 177.23 -118.23 -382.94 352.16
>>
  6 个评论
显示 4更早的评论
Atanu
Atanu 2022-5-8
Thank you everyone for your comments. I kept on trying with append method, and I think this gives me the result I wanted.
load('direction_table.mat');
rotation_time_by_direction = [];
for i = 1:10:height(direction_table)-10
direction_change = ones(1,10)';
for j = 1:10
direction_change(j,1) = abs(direction_table.direction(i,1)-direction_table.direction(i+j,1));
end
threshold_degree = 100;
if any(direction_change > threshold_degree)
rotation_time_by_direction = [rotation_time_by_direction; direction_table.rodent_RecordingTime(i)];
end
end
n_direction_table = direction_table{ismember(direction_table.rodent_RecordingTime,rotation_time_by_direction), :};

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Matrix Indexing 的更多信息

标签

产品


版本

R2022a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by