ASPL Manual v 1.00
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8. 4
   cD gets the element-checksums symmetric difference

 

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cD a1 a2 [a3 .. aN]       where a1 a2 [a3 .. aN] are set variables

cD`mtm~ a1 a2 [a3 .. aN]

cD/mtm~ a1 a2 [a3 .. aN]

cD

When specified by itself then the operation is performed on the object on top of the stack and the one that is one below it, then the result is pushed on the partition stack

tsetop  asetoid  2**  notcommu        ins:H_H_H  ous:H_H_AH

●  Operator cD gets the element-checksums symmetric difference

Use the operator cD or its equivalent c*D to get the symmetric difference in their checksums.

 

cD EXAMPLE
In this example we will compare the files between two directories based on their symmetric checksums. File with the different names but with same checksums will be revealed. The symmetric difference of checksums display only these files with unequal checksums.

 

cD OPERATION

# aspl WS1
    (start ASPL loading the sample workspace WS1 )

①  aspl> cD a1 a2
    (show the symmetric difference checksums between the datasets in a1 and a2)

The cD is the same as c*D

②  aspl> c*D a1 a2
    (show the symmetric difference checksums between the datasets in a1 and a2)

Notice that the `mtm~ is reverted to be as 'equal' since it is used in the context of the difference

③  aspl> cD`mtm~ a1 a2
    (show the symmetric difference checksums between the datasets in a1 and a2 whose mtimes are the same)

Notice that the `mtm= is reverted to be as 'unequal' since it is used in the context of the difference

④  aspl> cD`mtm= a1 a2
    (show the symmetric difference checksums between the datasets in a1 and a2 whose mtimes are the different)

 

● Tickable Predicates for cD

This cD is tickable with predicates that are shown in the following table:

       a yellow note
cD`_  gets the element-checksums symmetric difference 
cD`c=  gets the element-checksums symmetric difference such that they have the same checksum 
cD`c~  gets the element-checksums symmetric difference such that they have different checksums 
cD`c~~  gets the element-checksums symmetric difference such that they have all over different checksums 
cD`h=  gets the element-checksums symmetric difference such that they have the same entropy 
cD`h~  gets the element-checksums symmetric difference such that they have different entropies 
cD`h~~  gets the element-checksums symmetric difference such that they have all over different entropies 
cD`mtm=  gets the element-checksums symmetric difference such that they have the same make time 
cD`mtm~  gets the element-checksums symmetric difference such that they have different make times 
cD`mtm~~  gets the element-checksums symmetric difference such that they have all over different make times 
cD`ks=  gets the element-checksums symmetric difference such that they have the same ksum 
cD`ks~  gets the element-checksums symmetric difference such that they have different ksums 
cD`ks~~  gets the element-checksums symmetric difference such that they have all over different ksums 
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