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ch-2.ps
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ch-2.ps
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%!PS
% begin included library code
% see https://codeberg.org/Firedrake/postscript-libraries/
/test.start {
print (:) print
/test.pass 0 def
/test.count 0 def
} bind def
/test.end {
( ) print
test.count 0 gt {
(Passed ) print
test.pass (...) cvs print
(/) print
test.count (...) cvs print
( \() print
test.pass 100 mul test.count idiv (...) cvs print
(%\)) print
(\r\n) print
} if
} bind def
/test {
/test.count test.count 1 add def
{
/test.pass test.pass 1 add def
} {
( ) print
test.count (....) cvs print
(-fail) print
} ifelse
} bind def
% end included library code
/linearrecurrencesecondorder {
0 dict begin
/seq exch def
/a seq 0 3 getinterval def
/b seq 1 3 getinterval def
/c seq 2 3 getinterval def
/q
b 2 get a 0 get mul b 0 get a 2 get mul sub
b 1 get a 0 get mul b 0 get a 1 get mul sub idiv
def
/p a 2 get a 1 get q mul sub a 0 get idiv def
p a 0 get mul q a 1 get mul add a 2 get eq
p b 0 get mul q b 1 get mul add b 2 get eq and
p c 0 get mul q c 1 get mul add c 2 get eq and
end
} bind def
(linearrecurrencesecondorder) test.start
[1 1 2 3 5] linearrecurrencesecondorder test
[4 2 4 5 7] linearrecurrencesecondorder not test
[4 1 2 -3 8] linearrecurrencesecondorder test
test.end