Error when calculating the distance between two three-dimensional points

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lil brain
lil brain 2023-5-8
回答： Walter Roberson 2023-5-8
Hi,
I have a cell array that contains cells in which there are numerical arrays with 9 columns. In that numerical array the columns 1-3 are x, y, and z coordinates of point A. The columns 4-6 are x, y, and z coordinates of point B. And the columns 7-9 are x, y, and z coordinates of point C.
I wrote this code to measure the distances between point C and A.
for i = 1:numel(pre_xyz)
right_hand{i} = sqrt((pre_xyz{i}(:,7)-pre_xyz{i}(:,1)).^2 + (pre_xyz{i}(:,8)-pre_xyz{i}(:,2)).^2 + (pre_xyz{i}(:,9)-pre_xyz{i}(:,3)).^2);
end
But I get this error:
Operator '-' is not supported for operands of type 'cell'.
What is the easiest fix for this?
Thanks!
  1 个评论
Walter Roberson
Walter Roberson 2023-5-8
Ran in:
I have a cell array that contains cells in which there are numerical arrays with 9 columns.
load pre_xyz
pre_xyz{1}(1:5,:)
ans = 5×9 cell array
{[-0.2839]} {[1.6748]} {[-0.2873]} {[-0.2134]} {[1.3676]} {[-0.5863]} {[-0.0471]} {[1.3579]} {[-0.5301]} {[-0.2839]} {[1.6748]} {[-0.2873]} {[-0.2124]} {[1.3671]} {[-0.5861]} {[-0.0474]} {[1.3579]} {[-0.5299]} {[-0.2839]} {[1.6748]} {[-0.2873]} {[-0.2124]} {[1.3671]} {[-0.5861]} {[-0.0474]} {[1.3579]} {[-0.5299]} {[-0.2838]} {[1.6748]} {[-0.2866]} {[-0.2130]} {[1.3676]} {[-0.5846]} {[-0.0475]} {[1.3576]} {[-0.5286]} {[-0.2838]} {[1.6748]} {[-0.2866]} {[-0.2130]} {[1.3676]} {[-0.5845]} {[-0.0475]} {[1.3576]} {[-0.5286]}
No you do not. You have a cell array that contains cell arrays.

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采纳的回答

Walter Roberson
Walter Roberson 2023-5-8
for i = 1:numel(pre_xyz)
this_pre = cell2mat(pre_xyz{i});
right_hand{i} = sqrt((this_pre(:,7)-this_pre(:,1)).^2 + (this_pre(:,8)-this_pre(:,2)).^2 + (this_pre(:,9)-this_pre(:,3)).^2);
end

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