extract each ten values

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Housam 2019-7-14

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评论： Housam 2019-7-15

采纳的回答： Image Analyst

Hello,

I have a 60x23 cell and each cell consist of columns with different length.

I need to extract ten values starting from last ten values, then shift by one value and repeat.

In other words, after extacting the last ten values (end-9: end), i need to omit the last value. then extract the ten values before that. so on.

What would be the best way to achieve that? Thank you for the insights.

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dpb 2019-7-14

As described, probably a loop just recomputing the indices.

It's not clear, however, whether this is a moving-by-one element process or in groups of ten non-overlapping elements--the end objective could possibly be accomplished for either of those by far more efficient manners -- filter for the first, perhaps, or reshape by the 10 factor by columns for the latter for vector processing by column.

"It all depends..."

Give us a concrete example of what you're really after...

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Answer 1

Image Analyst 2019-7-14

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https://ww2.mathworks.cn/matlabcentral/answers/471630-extract-each-ten-values#answer_383146

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Try a loop to get the contents of the cells in your cell array, then extract 10 elements and move back towards the beginning of your vector one element at a time.

[rows, columns] = size(ca); % ca is your cell array with variable sized matrices in the cells.
for col = 1 : columns
    for row = 1 : rows
        % Get the array inside this cell from the cell array.
        thisVector = ca{row, col};
        % Get the size of this vector
        vecCols = length(thisVector);
        % Get last 10 values and move one element at a time towards the beginning of the vector.
        len = length(vecCols);
        for k = len - 9 : -1 : 1
            last10 = vecCols(k : k+9);
            % Now do something with last10.....
            % I don't know what that would be - you haven't told us.
        end
    end
end