loop of powers

pval = [1e-24 1e-23 1e-22 1e-21 1e-20]

How can I initialize such an array by inputting only -24 and -20? Many thanks for your time.

Answer 1

[Sean de Wolski]

p = 1*10.^[-24:1:-20]

Answer 2

[Walter Roberson]

logspace(-24, -20, 5)