问题
I want to remove all empty cells at the bottom of a matlab cell array. However all code example that I found collapse the matrix to a vector, which is not what I want.
So this code
a = { 1, 2; 3, 4; [], []}
emptyCells = cellfun('isempty', a);
a(emptyCells) = []
results in this vector
a = [1] [3] [2] [4]
But I want instead this array
a =
[1] [2] [3] [4]
How would I do that?
回答1:
If you want to delete all the rows in your cell array where all cell are empty, you can use the follwing:
a = { 1, 2; 3, 4; [], []}
emptyCells = cellfun('isempty', a);
a(all(emptyCells,2),:) = []
a =
[1] [2]
[3] [4]
The reason it didn't work in your formulation is that if you index with an array, the output is reshaped to a vector (since there is no guarantee that entire rows or columns will be removed, and not simply individual elements somewhere).
回答2:
This works for me:
a = { 1, 2; 3, 4; [], []};
emptyCells = cellfun('isempty', a);
cols = size(a,2);
a(emptyCells) = [];
a = reshape(a, [], cols);
but I'm not sure if it will be general enough for you - will you always have complete rows of empty cells at the bottom of your array?
回答3:
There is a function that generalizes the removing specific row/columns from a cell, which is called fun_removecellrowcols. Due to the removal, cell dimensions are resized.
回答4:
A simpler solution very specific to your problem is to convert the cell directly into a matrix:
cleanedA = cell2mat(a);
It converts to a normal matrix, and while doing this it removes the empty cells.
Then, of course, you can reconvert it to a cell array with the following command:
a = mat2cell(cleanedA, [1 1], [1 1])
Its not generic, but for the example posted it is the simplest solution I can think of.
来源：https://stackoverflow.com/questions/9697900/remove-empty-cells-in-matlab