How to color different variables in a scatter plot,

I am using Poisson distribution function to generate the number of variables each time I run the simulation and it generates randomly sometime 9, sometime 7 sometimes 11 and so on..

I want to color the data in scatter plot for all variables with different color for recognition of variables data. I used

if true
  colormat = random(1,3);
end

but when i plot the scatter it gives error Index exceeds matrix dimensions. Can you guide me where I am doing mistake.

Answer 1

[Walter Roberson]

random_values = YourPoisson_function(appropriate_parameters);
[unique_vals, ~, group_idx] = unique(random_values);
cmap = jet( length(unique_vals) );     %colormap with as many colors as groups
col_for_val = cmap(group_idx(:), :));   %index colormap by group number

x = 1 : length(random_values);   %scatter plots are 2D, need some x
pointsize = 20;

scatter(x, random_values, pointsize, col_for_val);

[Arsal15]

Thanks for your comment. But you are grouping data set which are unique or common in all data set.

But I want to color the value of var1,var2,var3....var9 each with separate colors and each var1,var2 ... var9 having data set of [1x101] values.