Conditional statement ENVI

Question

I am trying to do conditional statement in ENVI to calculate multiband image:

result = (b1)^2 - (b2)^2
if (b1 eq 0) or (b2 eq 0)
result * 0
else
result * (result gt 0.0)

Is there a way to combine the statements in Band Math? Or I have to write in IDL?

Answer 1

A bit late, but this expression would work using ENVI Band Math:

(b1^2 - b2^2) * ((b1 NE 0) AND (b2 NE 0))

HTH.