How can I get a delay input for a TDN within a specific range, but only use every n-th. sample.

Hello,

I´m trying to implement a TDN by timedelaynet() and after that I´m using preparets() to get the time delayed data to train and test it. I have a signal which is sampled by 50Hz so it´s not necessary to have every sample in a delay range from 1 to 100 and it´s decreasing the computing time if I use only every second sample in this delay range.

Maybe a little example:

Right now I´m implementing a TDN and telling it to have an input-delay by 100 and this net is given to preparets() and I get the output from this function which gives me the input-data-arrays, which are delayed by 100. But what I´m looking for is more like to set this up, to get a net, which gets the delayed input-data in the range from 1 to 100, but only uses every 4th sample. Which means i have the delay indices [1,5,9,13...] instead of [1,2,3,4,5,...].

How can I achieve this?