plotting data that is in an array



Hi

I have an array that is holding some bfloat numbers and I want to plot them.

I tried:
 plot2d(difar[x],[x,1,200]);
plot2d: expression evaluates to non-numeric value somewhere in plotting
range.

but no plot shows up.

difar has made with
array(difar,270);

and was filled in a for loop with
difar[k]:ar[k]-z,


How do you plot this array?
Doug Stewart