Iterating over Xarray resample skips elements

Question

I have a really long dataset in Xarray that I must resample using both a custom function and the mean function to create a new dataset with both data.
To do this, I do

ds_res = ds.resample(time=freq)

ds_mean = ds_res.mean('time')

aux_time = []    ;   aux_custom = []
for time,data in ds_res:
    aux_time.append(time)
    aux_custom.append( custom_function(data) )

new_ds = xarray.Dataset( ... )  #Merge both ds_mean and aux_custom over the coord time

This works well ALMOST every time, but sometimes the length of the aux lists are smaller than the length of the resample:

len(ds_res) > len(aux_time) 

So when I try to create the new dataframe it gives me the error of "ValueError: conflicting sizes for dimensions ..."

Any idea why this happens?? I checked the for loop and it really does less iterations than the length of the resampled dataset.
Maybe it is because of NaN values or something, I have no idea.

Answer 1

For the Dataset parameter data_vars, each dimension must have the same length in all variables in which it appears, as described here.

Are you specifying dims as a set instead of a list?

Maybe the example from this answer might help you: https://stackoverflow.com/a/60529275/16116707