MATLAB: Removing rows from table based on content

conditional removalMATLABremoving rowstable

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.

Best Answer

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"
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