MATLAB Answers

Delete entire rows based on one condition

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Khayroon Suleyman
Khayroon Suleyman on 5 Dec 2019
Edited: Luna on 9 Dec 2019
Hello,
I am a beginner in Matlab. I have a table that has 7 columns and 240 rows.
I need to delete entire rows based on the following condition:
1. if a value of column 7 is superior than 1000 and inferior than 100 => delete this row
I have attached an image of how the datset looks like. Please help!

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Answers (1)

Luna
Luna on 5 Dec 2019
Edited: Luna on 6 Dec 2019
Hi,
Try this:
data = num2cell(randi(5000,240,7)); % sample random data in a cell array
my_Table = cell2table(data); % convert cell array to table
new_table = my_Table(~(my_Table.data7 > 1000 | my_Table.data7 < 100),:); % filter and remove

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Luna
Luna on 6 Dec 2019
I think we have some misunderstanding here.
  1. You should define variable names while using cell2table. If you do not define them, Matlab autogenerates variable names for you and most probably the variable name will not be TargetexpRT. You should go to your Matlab's Workspace and double click the table to see what are your variable names.
  2. How did you import your CourseworkFinalDATAEXCEL ? when you run the line CourseworkFinalDATAEXCEL = cell2table(data); this only overrides my randomly created data to your CourseworkFinalDATAEXCEL so you should make an import again.
Here is some tips how to import from Excel:
readtable you should put 'ReadRowNames' input as true to read first column of your excel file as variable names.
Here in your case with your variable names:
CourseworkFinalDATAEXCEL = readtable('CourseworkFinalDATAEXCEL.xlsx','ReadRowNames',true);
new_table = CourseworkFinalDATAEXCEL(~(CourseworkFinalDATAEXCEL.TargetexpRT > 1000 | CourseworkFinalDATAEXCEL.TargetexpRT < 100),:);
Khayroon Suleyman
Khayroon Suleyman on 6 Dec 2019
It says:
Error using readtable (line 216)
Unable to open file 'CourseworkFinalDATAEXCEL.xlsx' as a workbook. Check that the file exists, read access is available, and the
file is a valid spreadsheet file.
Luna
Luna on 9 Dec 2019
Use the fullfile path and name together for example:
readtable('C:\Users\Desktop\...\CourseworkFinalDATAEXCEL.xlsx','ReadRowNames',true);
The path is where your excel file is.

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