[yt-users] How to use if, elif, else statements in creating a derived field

[Reju Sam John]

Dear all,

I would like to create a derived field which should return a value
according to specified conditions. My definition of new field is shown
below.. But it is giving error.


@derived_field(name = "MyField")
def my_new_field(field, data):
    if data.pf["MachNumber"] < 2 :
        return (.5* (data["MachNumber"])**2) - 1
    elif data.pf["MachNumber"] < 100 :
        return (.5* (data["MachNumber"])**4) + (.5* (data["MachNumber"])**3)
    else:
       return 5.446361E-01



Please suggest me how to implement if, elif, else statements in creating a
derived field.

Thank You
Reju Sam John
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