How to set x-axis tic values without moving the graph ?

[wahaj87]

Hi

I have a two dimensional graph in octave. I have used command :

semilogy("myarray","color","g");

It worked fine, as I require log scale for y-axis.

On x-axis it shows number of points (722) in my array named "myarray"
labeled from 0 to 800, with tics at difference of 100.

But I want that it should label 0 to -180, center point which is 722/2= 361
should be labeld 0, and point 722 should be labeled as 180.  ie;

    0...100...200...300...(361)...400...600...700...800  should be seen as
-180............................0............................180

I tried command set(gca,"xtick",[-180,180]) but it only show one tic on
xaxis labeled 180  like give below:

    ...............180..............................................

     
How to solve this problem ?

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