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Removing zeros in excel

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LIM JIAXIN
LIM JIAXIN el 7 de Feb. de 2019
Respondida: Guillaume el 7 de Feb. de 2019
Hi Guys,
Does anyone know how to remove zeros while keeping the zero that is at the beginning and end of a value from excel sheet to make figure 1 to look like figure 2.
Thank you!
  6 comentarios
Walter Roberson
Walter Roberson el 7 de Feb. de 2019
II am not clear on why the 0 is not preserved on top of the column with 4s?
Bob Thompson
Bob Thompson el 7 de Feb. de 2019
Editada: Bob Thompson el 7 de Feb. de 2019
There are two 0s on top of the 4s, only the adjacent one is retained.
At least that is what it looks like to me.

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Respuesta aceptada

Guillaume
Guillaume el 7 de Feb. de 2019
No loop, no cellfun:
filetoedit = 'C:\somewhere\somefile.xlsx';
[data, ~, ascell] = xlsread(filetoedit);
ascell(~conv2(data ~= 0, [1; 1; 1], 'same')) = {[]}; %the conv2(data ~= 0, [1; 1; 1], 'same') expands non-zeros one row up and down. The remaining 0 are replaced by []
xlswrite(filetoedit, ascell);

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Bob Thompson
Bob Thompson el 7 de Feb. de 2019
Guillaume and Walter will probably have much better methods for doing this, but here is my first thought.
[num,txt,data] = xlsread('myfile.xlsx'); % Read the excel file
for i = 1:size(data,1); % Loop through rows
for j = 1:size(data,2); % Loop through columns
if i > 1 & i < size(data,1) & data{i,j} == 0 & data{i+1,j} == 0 & data{i-1,j} == 0
data{i,j} = [];
elseif i == 1 & data{i,j} == 0 & data{i+1,j} == 0
data{i,j} = [];
elseif i == size(data,1) & data{i,j} == 0 & data{i-1,j} == 0
data{i,j} = [];
end
end
end
Unfortunately, I wasn't able to find a method that didn't involve loops, but I'm also not very good with cellfun.
  1 comentario
Guillaume
Guillaume el 7 de Feb. de 2019
cellfun is just a loop in disguise, often slower. What you gain with cellfun is guarantee that the output is the correct size and clarity (in my opinion) of the code. cellfun is also an example of functional programming which may be preferred over the imperative nature of loops.
Neither loops, nor cellfun are needed for this however.

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