Progressions can be created using the Colon operator

min   = 10
max   = 100
steps = 20

step_size = (max-min)/steps

i = min:step_size:max

Alternatively linspace can be used:

min   = 10
max   = 100
steps = 20

i = linspace(min,max,steps)

This also allows for easily switching to a log scale using logspace.