Removing rows from table based on content

Question

Jakub Steiner 2021-2-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/738267-removing-rows-from-table-based-on-content

评论： Jakub Steiner 2021-2-7

采纳的回答： KALYAN ACHARJYA

Sample.txt

在 MATLAB Online 中打开

Hi,

I got some data with "false" values that I need to remove

The data looks as following...

I need to remove all rows that include the letter "x". The fourth column sometimes consists only of the letter "x", sometimes it consists of "x" and other values as seen on the picture.

I am loading the data usinf following code

filename = 'Sample.txt';
fileID = fopen(filename);
opts = detectImportOptions(filename);
opts.VariableTypes{1} = 'string';
opts.VariableTypes{4} = 'string';
M = readtable(filename,opts);
fclose(fileID);

All help is welcomed and appreciated.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

KALYAN ACHARJYA 2021-2-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/738267-removing-rows-from-table-based-on-content#answer_616827

编辑：KALYAN ACHARJYA 2021-2-7

在 MATLAB Online 中打开

If you are wish to check the single string with x only, as in the rows 6 and 7, then you can accomplish it easily. In that case it avoid the removal of row 5, where x is also there within the string ( with Gap consideation).

id=find(strcmp('x',M.Var4));
M(id,:) = []

Result:

M =
  10×4 table
         Var1          Var2       Var3                    Var4             
    _______________    ____    __________    ______________________________
    "1598607723000"      4     6.5162e+14    "9049F00430000764B1BD4046DCEA"
    "1598607723000"     12     6.5162e+14    "8D06A10E99158B12D00427C73A6C"
    "1598607723000"     14     6.5162e+14    "8D06A10E99158B12D00427C73A6C"
    "1598607723000"     16     6.5162e+14    "8D06A10E99158B12D00427C73A6C"
    "1598607723000"     10     6.5162e+14    "8D06A10E99158B12D00427C73A6C"
    "1598607723000"     12     6.5162e+14    "x  5D4BCCB982A069"           
    "1598607723000"     14     6.5162e+14    "8D48C12B5811F16DD1085E938F4F"
    "1598607723000"     12     6.5162e+14    "8D48C12B5811F16DD1085E938F4F"
    "1598607723000"      4     6.5162e+14    "8D48C12B5811F16DD1085E938F4F"
    "1598607723000"      3     6.5162e+14    "8D48C12B5811F16DD1085E938F4F"

But If you wish to remove the 5 rows also, within the strings x is there, not single 'x' string, in that case I have used loop, may be it can be avoided.

for i=1:length(M.Var4)
     id(i)=max(strcmp('x',split(M.Var4(i))))
end 
M(id,:) = []

Result:

M =
  9×4 table
         Var1          Var2       Var3                    Var4             
    _______________    ____    __________    ______________________________
    "1598607723000"      4     6.5162e+14    "9049F00430000764B1BD4046DCEA"
    "1598607723000"     12     6.5162e+14    "8D06A10E99158B12D00427C73A6C"
    "1598607723000"     14     6.5162e+14    "8D06A10E99158B12D00427C73A6C"
    "1598607723000"     16     6.5162e+14    "8D06A10E99158B12D00427C73A6C"
    "1598607723000"     10     6.5162e+14    "8D06A10E99158B12D00427C73A6C"
    "1598607723000"     14     6.5162e+14    "8D48C12B5811F16DD1085E938F4F"
    "1598607723000"     12     6.5162e+14    "8D48C12B5811F16DD1085E938F4F"
    "1598607723000"      4     6.5162e+14    "8D48C12B5811F16DD1085E938F4F"
    "1598607723000"      3     6.5162e+14    "8D48C12B5811F16DD1085E938F4F"