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4C. Test

 d0=: -:&(/:~) Are x and y permutations of each other? m1=: /:~-:i.@# Is y a permutation vector? m2=: -:-@|: Is y antisymmetric? m3=: -:|: Is y symmetric? m4=: [:+./[:*./]=/0 1"_ Are all atoms of Boolean list y equal? m5=: *./ .= +./ Are all atoms of Boolean list y equal? m6=: *./ .= *./ Are all atoms of Boolean list y equal? d7=: -.@(] <:/ .>: >.@] , [)"1 Is y in the half open on the right interval x and is it an integer? d8=: e. Is list x a row of array y? m9=: *./@(= >./\) Are columns of y in ascending order? m10=: *./@(= <./\) Are columns of y in descending order? m11=: >./=<./ Are atoms of numerical list y equal? m12=: *./ +. -.@(+./) Are atoms of Boolean list y equal? m13=: *./ = +./ Are atoms of Boolean list y equal? m14=: *./@(= {.) Are atoms of list y equal? m15=: 0:=#|+/ Are atoms of Boolean list y equal? m16=: *./@(#1&|.) Are atoms of Boolean list y equal? m17=: ([:,:0:,#)-: v19"_ rxmatch ] Is y a legal J name? d18=: rxmatch=: 17!:0 '' to get rxmatch v19=: '[[:alpha:]][[:alnum:]_]* '"_ 'regex' to get alpha: and alnum:

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