$ pip install -U fortran-magic
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Collecting fortran-magic
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Requirement already satisfied, skipping upgrade: ipython in ./anaconda3/envs/python2.7/lib/python2.7/site-packages (from fortran-magic) (5.8.0)
Requirement already satisfied, skipping upgrade: numpy in ./anaconda3/envs/python2.7/lib/python2.7/site-packages (from fortran-magic) (1.16.5)
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Requirement already satisfied, skipping upgrade: prompt-toolkit<2.0.0,>=1.0.4 in ./anaconda3/envs/python2.7/lib/python2.7/site-packages (from ipython->fortran-magic) (1.0.18)
Requirement already satisfied, skipping upgrade: decorator in ./anaconda3/envs/python2.7/lib/python2.7/site-packages (from ipython->fortran-magic) (4.4.1)
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Building wheels for collected packages: fortran-magic
  Building wheel for fortran-magic (setup.py) ... done
  Created wheel for fortran-magic: filename=fortran_magic-0.7-cp27-none-any.whl size=7047 sha256=b43b7e253d506c450cae290c3c0f2f0ebcf047661313574aa2e01ead2401092d
  Stored in directory: /Users/name/Library/Caches/pip/wheels/69/d1/e6/83c19e88d0641ed69f32b506aa07dc1283f5339ad6d393f4f7
Successfully built fortran-magic
Installing collected packages: fortran-magic
Successfully installed fortran-magic-0.7

In[1]: %load_ext fortranmagic

In[2]: %%fortran
        subroutine f1(x, y, z)
        real, intent(in) :: x,y
        real, intent(out) :: z
        z = sin(x+y)
        end subroutine f1

In[3]: f1(1.0, 2.1415)
Out[3]: 9.26574066397734e-05

In[4]: %%fortran
        subroutine my_function(x, y, z)
            real, intent(in) :: x(:), y(:)
            real, intent(out) :: z(size(x))
            ! using vector operations
            z(:) = sin(x(:) + y(:))
        end subroutine

In[5]: 
import numpy
x = numpy.random.normal(size=10)
y = numpy.random.normal(size=10)
z = my_function(x, y)
z

Out[5]: 
array([-0.40036342, -0.5483717 , -0.71112984, -0.31596676, -0.9789854 ,
        0.16493222, -0.845283  , -0.94829416,  0.8096917 ,  0.888128  ],
      dtype=float32)