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plotting figure ignore blank entries

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Emily Platt
Emily Platt on 19 May 2021
Commented: Adam Danz on 22 May 2021
hello
i have a cell array with 5000+ rows and 1 column
i was to plot a figure but my problem is that there are many blank entries. i want the figure to consider plots from the previous entry that has a number to the next one (i.e. i will be doing a stacked time series so i dont want these empty cells to be completely ignored)
  3 Comments
Emily Platt
Emily Platt on 20 May 2021
TapsX=
'321'
''
''
''
''
''
''
''
'264'
''
''
''
''
''
''
''
'301'
...
so between every value there are 7 empty cells
I want to use the plot function to make a simple one line figure

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Accepted Answer

Adam Danz
Adam Danz on 20 May 2021
Edited: Adam Danz on 20 May 2021
Convert the cell array of character vectors or the string array to a numeric vector, then remove NaN values.
% Or string array: TapsX = ["123" "" "" "" "200" "" "" "321" "" ""];
TapsX = {'123' '' '' '' '200' '' '' '321' '' ''};
TapsXnum = str2double(TapsX)
TapsXnum = 1×10
123 NaN NaN NaN 200 NaN NaN 321 NaN NaN
TapsXnum(isnan(TapsXnum)) = []
TapsXnum = 1×3
123 200 321
Since you have TapsX I assume you have TapsY with the same problem. In that case you'll need to remove the elements pair-wise to maintain the paired coordinates.
TapsX = ["123" "94" "" "" "200" "" "88" "321" "" "2"];
TapsY = [ "" "94" "135" "" "200" "" "88" "" "112" "2"];
TapsXnum = str2double(TapsX);
TapsYnum = str2double(TapsY);
nanIdx = isnan(TapsXnum) | isnan(TapsYnum);
TapsXnum(nanIdx) = []
TapsXnum = 1×4
94 200 88 2
TapsYnum(nanIdx) = []
TapsYnum = 1×4
94 200 88 2
Lastly, I suspicious as to why your numeric values are represented as strings in the first place. If the are read in that way from a file, the best solution might be to read them in correctly as numeric values. Why are they strings?
  2 Comments
Adam Danz
Adam Danz on 22 May 2021
You shouldn't have too much trouble adapting that to your data. If you have any trouble show us what you've got and I can help straighten it out.

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More Answers (1)

Mathieu NOE
Mathieu NOE on 20 May 2021
hello
remove first the empty cells , example below (R is the cell array)
R = R(~cellfun('isempty',R));
plot(cell2mat(R))
  1 Comment
Adam Danz
Adam Danz on 20 May 2021
The output is a char array. If R is a row vector, then the output is one long char vector.
R = {'123' '' '' '' '200' '' '' '321' '' ''}';
R = R(~cellfun('isempty',R))
R = 3×1 cell array
{'123'} {'200'} {'321'}
cell2mat(R)
ans = 3×3 char array
'123' '200' '321'

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