add column of sequential numbers to table

I have an 1870x12 tabl, I want to add a 13th column that just sequentially counts (e.i. cell 1 reads 1, cell 2 reads 2, etc all the way to 1870). Not sure how to accomplish this, I previously had it so that it created a new column with just zeros, but not sure how to get it to be a sequential count instead. Thanks for the help!!

T.(name) = zeros(1870,1); %to make new column of just zeros where original table is T

Answer 1

[Voss]

Here's one way to do it (shown using a smaller table):

T = array2table(rand(15,4))

T = 15×4 table
      Var1        Var2        Var3        Var4  
    ________    ________    ________    ________

     0.74338      0.1352     0.63025     0.48214
     0.02299     0.35028     0.93461     0.35399
     0.46931     0.90706     0.36703     0.13832
     0.55901     0.80218    0.025169      0.7931
      0.4281     0.42508     0.65878     0.94011
     0.41303     0.49159     0.68385     0.10559
     0.38813     0.84224     0.60001     0.18712
      0.2503     0.82437      0.9315     0.22304
     0.32831    0.034636     0.16947     0.55141
     0.76743     0.26209     0.34005     0.87865
      0.3409     0.55099     0.99775     0.93093
    0.051406     0.42341     0.67854    0.059411
     0.27198     0.67174     0.46781     0.53463
    0.010137     0.29492     0.90293     0.68013
     0.73003     0.89482     0.53096     0.32032

T.new_column = (1:size(T,1)).'

T = 15×5 table
      Var1        Var2        Var3        Var4      new_column
    ________    ________    ________    ________    __________

     0.74338      0.1352     0.63025     0.48214         1    
     0.02299     0.35028     0.93461     0.35399         2    
     0.46931     0.90706     0.36703     0.13832         3    
     0.55901     0.80218    0.025169      0.7931         4    
      0.4281     0.42508     0.65878     0.94011         5    
     0.41303     0.49159     0.68385     0.10559         6    
     0.38813     0.84224     0.60001     0.18712         7    
      0.2503     0.82437      0.9315     0.22304         8    
     0.32831    0.034636     0.16947     0.55141         9    
     0.76743     0.26209     0.34005     0.87865        10    
      0.3409     0.55099     0.99775     0.93093        11    
    0.051406     0.42341     0.67854    0.059411        12    
     0.27198     0.67174     0.46781     0.53463        13    
    0.010137     0.29492     0.90293     0.68013        14    
     0.73003     0.89482     0.53096     0.32032        15    

[Kaiya Shealy]

This works, thank you!

[Voss]

You're welcome!

[Tu DoThanh]

Dear sir, how to put the new column to the front of the table - i mean in the first column