MATLAB: How to delete columns from something that isn’t a matrix

columndatadeletematrix

I've got some data that I need columns deleting from, specificially 3,4,5,9,10,12,13,14 but whenever I try the following code, with data set A, I get the answer "Deletion requires an existing variable."
 A(:,[3 4 5 9 10 12 13 14])=[];
Is this because my data is not technically a matrix?
Below is some of my data
 2018-01-01T00:00 273.450   2.350 -999.000 -999.000 -999.000 -999.000 -999.000  -1.000 -999.000 -999.000   0.000 -999.000 -999.000 -999.000
2018-01-01T01:00 273.250   1.570 -999.000 -999.000 -999.000 -999.000 -999.000  -1.000 -999.000 -999.000   0.000 -999.000 -999.000 -999.000
2018-01-01T02:00 273.350   0.510 -999.000 -999.000 -999.000 -999.000 -999.000  -1.000 -999.000 -999.000   0.000 -999.000 -999.000 -999.000
2018-01-01T03:00 273.250   1.420 -999.000 -999.000 -999.000 -999.000 -999.000  -1.000 -999.000 -999.000   0.000 -999.000 -999.000 -999.000
2018-01-01T04:00 273.350   0.140 -999.000 -999.000 -999.000 -999.000 -999.000  -1.000 -999.000 -999.000   0.000 -999.000 -999.000 -999.000
2018-01-01T05:00 275.550   0.700 -999.000 -999.000 -999.000 -999.000 -999.000  -1.000 -999.000 -999.000   0.000 -999.000 -999.000 -999.000
Thanks!

Best Answer

EDITED
T=readtable('sample.txt'); % your filename
T(:,[3 4 5 9 10 12 13 14])=[]
Gives:
 T =
  6×7 table
           Var1            Var2     Var6    Var7    Var8    Var11    Var15
    __________________    ______    ____    ____    ____    _____    _____
    '2018-01-01T00:00'    273.45    -999    -999    -999    -999     -999 
    '2018-01-01T01:00'    273.25    -999    -999    -999    -999     -999 
    '2018-01-01T02:00'    273.35    -999    -999    -999    -999     -999 
    '2018-01-01T03:00'    273.25    -999    -999    -999    -999     -999 
    '2018-01-01T04:00'    273.35    -999    -999    -999    -999     -999 
    '2018-01-01T05:00'    275.55    -999    -999    -999    -999     -999
Note: Download the attached document and try my code.
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