how to drawing dotted plot

[1surya]

I have 100 amino acid residues which have phi and psi angle.These range from -180 to 180 degress.
I represented the frequencies of 100 residues in the form of a two dimentional array with the help of references.
I took a range of 10 degrees
like -180 t0 -170(total i have 36 for phi and 36 for psi angles) .For each phi and psi corresponding angles I counted to which square it falls and I incremented it.Now I got the frequencies of the amino acids which falls in a perticular angle(its like 36 rows and 36 colums ).Now I want to represent it in the graphical way.Like more freq in one color and less frequencies in light color.
I tried by installing GD module.but I am not successfull.
Can any body sujjest me how can I do graphical representation with perl

 

[fortytwo]

Hi,

Have a look at these graphics modules:

http://search.cpan.org/modlist/Graphics

although I would consider doing this with rrdtool which is not perl:

http://www.lk.etc.tu-bs.de/lug/linuxtage/blt_2/cd_online/vortraege/rrdtool/website/

Will.
fortytwo
will@hellacool.co.uk

 

[1surya]

Hi will
My idea is same as yours but I am not successfull in using GD module in my perl script
my script is unable to load GD::Image object.
I am not abel to fix the problem.
I will go through rrdtool .
thank you for your sujjestions