4.38.3 Can you answer these questions?

4.38.3.1 How to decode Ascii85 format (AKA base85)?

https://mathematica.stackexchange.com/questions/156667/how-to-decode-ascii85-format-aka-base85

 
The ASCII85 encoding is a binary string encoding where every four bytes are encoded with five ASCII letters, using 85 different types of characters. 
 
Unfortunately, it's not in $CharacterEncodings: 
 
 
...
 

- asked by M.R. 2votes

4.38.3.2 FIR filter and the relation between Sample rate and cut-off frequency

https://mathematica.stackexchange.com/questions/156685/fir-filter-and-the-relation-between-sample-rate-and-cut-off-frequency

 
I have problem to unterstand the logic of the cut-off frequency of the FIR filter. 
Suppose my sample rate is 2MHz and I want to design a lowpass filter with a cut-off frequency 100Hz. What will be  ...
 

- asked by shabir barzanjeh 2votes

4.38.3.3 FindCluster only finds cluster "with a little help"

https://mathematica.stackexchange.com/questions/156984/findcluster-only-finds-cluster-with-a-little-help

 
Currently I made some slides to illustrate clustering. As an example I made a point set of two clusters: 
 
{clusters, graph} = Block[{c1, c2, cluster1, cluster2}, 
c1 = {1, 2}; 
cluster1 = (# +  ...
 

- asked by mgamer 4votes

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