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Help with complex Raster Calculator expression?

Question asked by litan@1 on Oct 9, 2015
Latest reply on Oct 10, 2015 by curtvprice

I am writing an expression in raster calculator, the expression is like:

 

''1  /  1 + [ Exp * * - ( 10.358 + ( -0.213 * "debrisrast") + ( -0.226 * "frntalrast") + ( -11.172 * "massbrast")]''.

 

It showing an wright expression, but when i run the programme, it failed. so what might be the problem?

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