kalmar/Groups.jl
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fix the replace! function in case length(toreplace)= 1

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This commit is contained in:
kalmar 2017-07-05 16:18:04 +02:00
parent 5a9d4b4bb6
commit 6c8591b1d4
1 changed files with 25 additions and 12 deletions
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15
src/Groups.jl
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@ -310,6 +310,19 @@ end
function replace!(W::GWord, index, toreplace::GWord, replacement::GWord; check=true)
n = length(toreplace.symbols)
if n == 0
return reduce!(W)
elseif n == 1
if check
@assert is_subsymbol(toreplace.symbols[1], W.symbols[index])
end
first = change_pow(W.symbols[index],
W.symbols[index].pow - toreplace.symbols[1].pow)
last = change_pow(W.symbols[index], 0)
else
if check
@assert is_subsymbol(toreplace.symbols[1], W.symbols[index])
@assert W.symbols[index+1:index+n-2] == toreplace.symbols[2:end-1]
@ -318,9 +331,9 @@ function replace!(W::GWord, index, toreplace::GWord, replacement::GWord; check=t
first = change_pow(W.symbols[index],
W.symbols[index].pow - toreplace.symbols[1].pow)
last = change_pow(W.symbols[index+n-1],
W.symbols[index+n-1].pow - toreplace.symbols[end].pow)
end
replacement = first * replacement * last
splice!(W.symbols, index:index+n-1, replacement.symbols)