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I have a function that takes the argument NBins. I want to make a call to this function with a scalar 50 or an array [0, 10, 20, 30]. How can I identify within the function, what the length of NBins is? or said differently, if it is a scalar or a vector?
I tried this:
>>> N=[2,3,5] >>> P = 5 >>> len(N) 3 >>> len(P) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: object of type 'int' has no len() >>> As you see, I can't apply len to P, since it's not an array.... Is there something like isarray or isscalar in python?
thanks
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To check if an element is scalar or not in Python, use the numpy isscalar() method. The isscalar() function returns True if the type of num is a scalar type.
To get the type of a variable in Python, you can use the built-in type() function. In Python, everything is an object. So, when you use the type() function to print the type of the value stored in a variable to the console, it returns the class type of the object.
The is_scalar() function checks whether a variable is a scalar or not. This function returns true (1) if the variable is a scalar, otherwise it returns false/nothing. Integers, floats, strings, or boolean can be scalar variables. Arrays, objects, and resources are not.
Briefly, a scalar is one variable - for example an integer. It can take different values at different times, but at any one time it only has one single value. An array is a set of variables - in most languages these all have to be of the same type.
>>> isinstance([0, 10, 20, 30], list) True >>> isinstance(50, list) False To support any type of sequence, check collections.Sequence instead of list.
note: isinstance also supports a tuple of classes, check type(x) in (..., ...) should be avoided and is unnecessary.
You may also wanna check not isinstance(x, (str, unicode))
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