[Function]

(expl power [:y0 n] [:y1 n] [:base n])

Returns an exponential value between y0 and y1 according to power, which ranges from 0 to 1. When power is 0 y0 is returned, when power is 1 y1 is returned. y0 and y1 default to 0 and 1, respectively. base determines the slope of the exponential curve, if it is less than 1 then the exponential curve is concave, otherwise a convex curve is produced. The default value of base is 2.

cm> (expl 0 5 1 1/256)
0.0
cm> (expl 1 5 1 1/256)
5.0
cm> (expl .5 5 1 1/256)
1.235
cm> ;;;
create
cm> envelope
ramping
cm> from
3
cm> to
.5
cm> (loop for i to 1 by .2 append (list i (expl i 3 .5 1/256)))
(0 3.0 0.2 1.31 0.4 0.76 0.6 0.58 0.8 0.51 1.0 0.5)
cm>

See Also:

• decimals [Function]
• explseg [Function]
• explsegs [Function]
• fit [Function]
• quantize [Function]
• rescale [Function]