Matplot with colorbar and negative values

[joschi]

Hi Group,

i try to do a plot for a matrix with contains negative values. If i try to
plot the matrix with Matplot i got with or black fields for the negative
values. Plz. try my example.

What i am doing wrong?

z=[-1 -7 5;2 4 7;8 6 9];
scf(); 
ncol=10;
xset("colormap",jetcolormap(ncol)); 
xtitle("Effect", "Variable", "Response");
colorbar(min(z),max(z),[1,ncol],fmt="%.2f");
Matplot(z);


Next prob is that if i wanna have more color than values e.g. ncol=32, the
values are not set right.
red is corresponding to the last value (here: 9) but thes are all color blue

z=[1 7 5;2 4 7;8 6 9];
scf(); 
ncol=32;
xset("colormap",jetcolormap(ncol)); 
xtitle("Effect", "Variable", "Response");
colorbar(min(z),max(z),[1,ncol],fmt="%.2f"); 
Matplot(z);

Last is how can i add more tics to the colorbar. By default i get 4 values
shown at the solorbar, but i wanna have, for my example from 1 to 9 an entry
at the colorbar 1 2 3 4 5 6 7 8 9.

Thanks in advance

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