## [Help] Create Logical Expression(Math) Band

Please enter here to ask a question about any NASA Science related topics!
phamicha
Posts: 6
Joined: Mon Aug 14, 2017 9:10 pm America/New_York

### [Help] Create Logical Expression(Math) Band

Hi all,
I have a problem related to Create Logical Expression(Math) Band.
I was used formulation TSS = 1.7532*E^(204.26*Rrs_660) by Create Logical Expression(Math) Band function. The result show only unique value equal 2.
Please help me to explain what is wrong and tell me how to fix this problem?
The below images show my problem, and I am using GOCI data.
Thank you.

Tags:

OB SeaDAS - knowles
Subject Matter Expert
Posts: 227
Joined: Mon Apr 07, 2008 4:40 pm America/New_York

### [Help] Create Logical Expression(Math) Band

The bandMath expression  TSS = 1.7532*E^(204.26*Rrs_660)  is not doing what you think it is suppose to do.  You are confusing the caret operator "^", which is actually doing a bitwise exclusive-OR on two integers, with the a formatting style of writing "^" to represent the power notation.

To formulate your expression, use either:
TSS = 1.7532*exp(204.26*Rrs_660)
or
TSS = 1.7532*pow(E,(204.26*Rrs_660))

Danny

phamicha
Posts: 6
Joined: Mon Aug 14, 2017 9:10 pm America/New_York

### [Help] Create Logical Expression(Math) Band

Thank you very much for your help.