reshaping vector with uneven elements and zero padding

Question

KDRA 2018-10-31

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https://ww2.mathworks.cn/matlabcentral/answers/427108-reshaping-vector-with-uneven-elements-and-zero-padding

编辑： Stephen23 2018-10-31

Hi!

I have vector with n elements and another variable specifying the length of each row. example, A = [ 5 3 8 2 3 5 8; B = [ 2 3 2 ] I want to create matix where I take first two elements of variable A, new row would be next three elements of variable A and last row would be the last two elements of ariable A. Because they have different dimensions I guess we need to add zeros in the place of missing elements. So the expected result would be: C = [5 3 0; 8 2 3; 5 8 0].

I would appreciate some tips!

K.

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Answer 1

Stephen23 2018-10-31

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https://ww2.mathworks.cn/matlabcentral/answers/427108-reshaping-vector-with-uneven-elements-and-zero-padding#answer_344350

编辑：Stephen23 2018-10-31

在 MATLAB Online 中打开

It would be simpler to use a cell array and mat2cell:

>> A = [5,3,8,2,3,5,8];
>> B = [2,3,2];
>> C = mat2cell(A,1,B);
>> C{:}
ans =
   5   3
ans =
   8   2   3
ans =
   5   8

If you really want one numeric matrix then preallocate an array and use a loop.

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Stephen23 2018-10-31

编辑：Stephen23 2018-10-31

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KDRA's "Answer" moved here and formatted properly:

Ok actually it was originally a cell array. This is my code:

for kk = 1:mfiles
       for pp = 1:length(S{kk}.Data.RecordedData.Measured)
            Data_name{kk}{pp} = S{kk}.Data.RecordedData.Measured{pp}.CurveComment.Text;
            Data_side{kk}{pp} = S{kk}.Data.RecordedData.Measured{pp}.EarSide.Text;
            for dd = 1:size(S{kk}.Data.RecordedData.Measured{pp}.XYData,2)
                Data_measured{kk}{pp}(dd) = str2double(S{kk}.Data.RecordedData.Measured{pp}.XYData{dd}.Y.Text);                
            end
       end
 end
Data_name = [Data_name(:)];
Data_side = [Data_side(:)];
Data_description = [Data_name, Data_side];
Data_description = join(Data_description,'_');

The error shows up for the very last line (First argument must be a string array, character vector, or cell array of character vectors). What I want to do is to merge the two multidimentional cell arrays into one and then fit the measured values for each of them. I thought it will be easier using matrices, therefore my question. But if there's easier way to do it, I will be more than happy to learn!

Stephen23 2018-10-31

编辑：Stephen23 2018-10-31

在 MATLAB Online 中打开

@KDRA: you have nested your cell arrays, so you have cell arrays inside other cell arrays:

Data_name{kk}{pp} = ...

I suspect that you tried to un-nest them with these lines, but you used the wrong indexing type, so basically those lines do not change the nesting and the brackets are totally superfluous:

Data_name = [Data_name(:)];
                      ^ ^   convert the cell array to a column.
            ^            ^  superfluous: there is nothing to concatenate here.

To un-nest you will need to use cell indexing (curly braces):

Data_name = [Data_name{:}];
                      ^ ^   get cell contents in a comma-separated list.
            ^            ^  concatenate the contents together.

Read more about how comma-separated lists work:

https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html

https://www.mathworks.com/matlabcentral/answers/320713-how-to-operate-on-comma-separated-lists

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