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

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.
The below images show my problem, and I am using GOCI data.
Thank you.

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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.