RDP IPA FX Volatility

aya.nakamura3

I am trying to plot fx vol surf using the file I found on Git Hub in below link.

https://github.com/Refinitiv-API-Samples/Article.RDPLibrary.Python.VolatilitySurfaces_Curves

File name "Vol Surfaces Webinar.ipynb". It worked for ETI option but for FX Volatility Surface, it returned error. Vol Surfaces Webinar.zip

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fx_surfaces = fx_response.data.raw['data']

plot_surface(fx_surfaces, 'FxVol-USDSGD', True)

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TypeError                                 Traceback (most recent call last)
<ipython-input-23-1b085c0e4326> in <module>
      1 fx_surfaces = fx_response.data.raw['data']
----> 2 plot_surface(fx_surfaces, 'FxVol-USDSGD', True)

<ipython-input-5-0e89ac2f0bf9> in plot_surface(surfaces, surfaceTag, delta_plot)
     26         # When plotting FX Delta rather than Strike
     27         # I'm converting the x axis value from Delta to Put Delta
---> 28         delta_axis = list(map(convert_delta, strike_axis))
     29         x = np.array(delta_axis, dtype=float)
     30     else:

<ipython-input-5-10b94499ab72> in convert_delta(delta)
      1 def convert_delta(delta):
----> 2     if (delta<0):
      3         return -delta
      4     elif (delta>0):
      5         return 1-delta 
TypeError: '<' not supported between instances of 'str' and 'int'

umer.nalla

Hi @aya.nakamura3

The problem seems to be that for FX, the strike_axis values now contain an at the money text value:

[-0.1, -0.15, -0.2, -0.25, -0.3, -0.35, -0.4, -0.45, 'ATM', 0.45, 0.4, 0.35, 0.3, 0.25, 0.2, 0.15, 0.1]

So, it would appear there has been a change to the Vol Surfaces response since when I presented the Webinar and the notebooks.

I am not 100% sure but I think the following should fix this:

def convert_delta(delta):

    if (delta=='ATM'):
        return 0.5
    elif (delta<0):
        return -delta
    elif (delta>0):
        return 1-delta
    else:
        return 0.5

I have asked the IPA team to confirm if the above is correct and if there could be other text values I need to consider.

I will update the notebook on Github once they have confirmed the corrections.