Error: unsupported operand type(s) for /: 'str' and 'float' when converted to Python

[DavidClapp]

Hi,

I converted a model to Python but I received an error message when trying to calculate slope cost. I believe that it has to do with Python treating the resulting slope as a string in the formula and that I need to somehow convert forest_slope from a string to a float but anything that I have tried does not seem to work. Any suggestions are appreciated. Forest is a DEM layer.

# Calculate the slope across the surface.

arcpy.gp.Slope_sa(forest, forest_slope, "DEGREE", "1")

# Calculate the slope cost based upon a nonlinear trigonometric cost function.

arcpy.gp.RasterCalculator_sa("Sin((\"%forest_slope%\")/57.2958)*200", forest_slope_cost)

ERROR 000539: Error running expression: rcexec() <type 'exceptions.TypeError'>: unsupported operand type(s) for /: 'str' and 'float'

Failed to execute (RasterCalculator).

[JakeSkinner]

I would try using the commands outside of the Raster Calculator.  Ex:

import arcpy
from arcpy import sa
from arcpy.sa import *

arcpy.CheckOutExtension("spatial")

forest = r"c:\test.gdb\forest"

forest_slope = arcpy.sa.Slope(forest, "DEGREE", "1")
sin = arcpy.sa.Sin(forest_slope)
divide = arcpy.sa.Divide(sin, 57.2958)
multiply = arcpy.sa.Times(divide, 200)

multiply.save(r"c:\test.gdb\forest_slope_cost")

[DavidClapp]

This worked, it maintained the type raster. The conversion of the spatial analyst tools from Model Maker to Python results in script type outputs which caused the errors. Thanks much!