Re: [Gnuplot-info] Printing of alphabetical data in x-axis

[Lars H. <la...@ho...>]

Hello!

> I made the datafile of following format:
>
> 1(A)    45
> 2(S)    36
> 3(G)    63
>
> Number in the parenthesis in the first column denotes the
> index no. of amino acid residues- A,S,G. This way I have
> been able to plot the graphs where 1,2,3 are printed on
> the x-axis, but I want A,S,G to be printed on the x-axis
> rather than the numbers. How can this be achieved with
> Gnuplot?

I would do it like follows. The datafile should be like this 
(three columns):

1 A 45
2 S 36
3 G 63

Now I plot column 3 over column 1
  plot "datafile" using 1:3
Since gnuplot is not able to use the information of column 2 
for the tic markers of the x-axis, I would set them 
manually
  set xtics ("A" 1, "S" 2, "G" 3)
This produces three tics at the positions 1, 2 and 3 named 
A, S and G. There are more options for manually set xtics, 
especially font types or rotating text (depends on the 
terminal abilities);  see  "help xtics". If you wuold like 
to set also minor tics, see "help mxtics".

Before others accuse me: There are ways of using the second 
columns textkind information for the xtics automatically. 
Most of the solutions I saw for this problem were very 
complicated and depended on the help of external 
programmes. 

Regards
Lars