Correct use of lambda functions for exponential of variable

[JairoVS]

Hello! I am using the "Magnus-Tetens" formula for calculating the saturation vapor pressure to use it in subsequent calculations of relative humidity. The formula is:

ew = 6.112 e(17.67 t/(243.5 + t))

I am using the lambda function in nctoolkit for the calculation. The way I wrote the formula is:

ds.assign(es=lambda x: 6.112exp((x.T_c17.67)/(x.T_c+243.5)))

with T_c being the column for Temperature in my netCDF. What I would like to ask is if I am properly using the lambda function for the calculation. Is it okay to call x.T_c twice in two different sections of the formula?

I appreciate your guidance on this!

[robertjwilson]

Hi @JairoVS. That is totally OK. assign will be able to use anything within the lambda function, so long as it evaluates to a number. So you could replace the constants with Python variables, for example.

[JairoVS]

I appreciate your useful answer @robertjwilson! I will use assign for my analysis.