How to apply a formula to each cell of a numpy array
Question: I am trying to take an existing numpy array and apply a formula to each cell
of the array. I have the code below but it returns the following error.
Traceback (most recent call last): File "C:\gTemp\Text-1.py", line 5, in
myarray = 0.1236 * math.tan(myarray / 2842.5 + 1.1863) TypeError: only
length-1 arrays can be converted to Python scalars

I am new to numpy and I am looking for skill level appropriate advice. Here is
my existing code.

    
    
    import arcpy
    import numpy
    import math
    myarray =  numpy.load(r"E:\depthtester2.npy")
    myarray = 0.1236 * math.tan(myarray / 2842.5 + 1.1863)
    myRaster = arcpy.NumPyArrayToRaster(myarray,arcpy.Point(0.0,0.0),1.0, 1.0, -99999.0 )
    myRaster.save("E:\deptht")
    print "done"
    


Answer: Instead of `math.tan()`, use
[`numpy.tan()`](http://docs.scipy.org/doc/numpy/reference/generated/numpy.tan.html).
The numpy functions are designed to work elementwise on numpy arrays.

