How do I change a copy of a cell array without changing the original cell array?

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Robert Pastor 2021-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/866900-how-do-i-change-a-copy-of-a-cell-array-without-changing-the-original-cell-array

评论： Rik 2021-6-29

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I have a 1x2 cell array of two collisionBox objects.

I want to create a copy of the cell array and then change the Pose matrices in the collisionBox objects.

However, when I change the copy, the original changes as well.

How to create a copy of a cell array that is not linked to the original?

ws_ = ws;
ws_{1}{1}.Pose(1,4) = -ws{1}{1}.Pose(1,4);
ws_{1}{1}.Pose(3,4) = -ws{1}{1}.Pose(3,4);
ws_{1}{2}.Pose(1,4) = -ws{1}{2}.Pose(1,4);
ws_{1}{2}.Pose(3,4) = -ws{1}{2}.Pose(3,4);

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Robert Pastor 2021-6-29

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After learning that this is not cell array specific, but rather handle class specific, I found this workaround here

copyStream = getByteStreamFromArray(objToCopy);
objCopy = getArrayFromByteStream(copyStream);

Works for cel array as well.

Rik 2021-6-29

This has indeed nothing to do with the cell. There are two fundamental kinds of variables: handle classes and data classes. A handle will only contain a pointer to the data itself, so copying the variable will only create a new pointer to the same data. Copying a data variable will create a copy of the data itself (although for memory efficiency Matlab uses a copy-on-write system where a variable is only actually duplicated when you change an element).

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