Delete entire rows based on one condition

2019 12 5
1 个回答
更新时间：2022 5 29
46 次查看（30 天）

0 个投票

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!

请先登录，再回答此问题。

回答（1 个）

Luna
Luna 2019-12-5
编辑：Luna 2019-12-6

3 个投票

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

11 个评论
显示 9更早的评论 隐藏 9更早的评论

Image Analyst
Image Analyst 2019-12-5
Try again -- he want to delete those rows, not extract (keep) them.
Luna
Luna 2019-12-6
Made a small change. Can you check again?
Khayroon Suleyman
Khayroon Suleyman 2019-12-6
Still doesn't do what I want it to unfortunately
Luna
Luna 2019-12-6
编辑：Luna 2019-12-6
Can you share your code and we make updates on it?
my_Table -> your table name (which is CourseworkFi....)
data7 -> your 7th column name. (which is Targetexp...)
Use (.) dot notation between.
Khayroon Suleyman
Khayroon Suleyman 2019-12-6
There is no issue with the code, but it just doesn't remove the rows that have values in column 7 that are greater than 1000 and less than 100.
Khayroon Suleyman
Khayroon Suleyman 2019-12-6
I used this code but it said: Unrecognized table variable name 'TargetexpRT'.
data = num2cell(randi(5000,240,7)); % sample random data in a cell array
CourseworkFinalDATAEXCEL = cell2table(data); % convert cell array to table
new_table = CourseworkFinalDATAEXCEL (~(CourseworkFinalDATAEXCEL.TargetexpRT > 1000 | CourseworkFinalDATAEXCEL.TargetexpRT < 100),:); % filter and remove
Luna
Luna 2019-12-6
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 2019-12-6
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 2019-12-9
编辑：Luna 2019-12-9
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.

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 Spreadsheets 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by