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Fix show for empty tensors #329

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Merged
Jutho merged 2 commits into from
Dec 15, 2025
Merged

Fix show for empty tensors #329

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9b6e067
avoid divide by zero for showing empty tensors
lkdvos Dec 14, 2025
5dd0cc9
add test
lkdvos Dec 14, 2025
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2 changes: 1 addition & 1 deletion src/tensors/blockiterator.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -50,7 +50,7 @@ function show_blocks(io, mime::MIME"text/plain", iter; maytruncate::Bool = true)
numlinesleft, numcols = get(io, :displaysize, displaysize(io))::Tuple{Int, Int}
numlinesleft -= 2 # lines of headers have already been subtracted, but not the 2 spare lines for old and new prompts
minlinesperblock = 7 # aim to have at least this many lines per printed block (= 5 lines for the actual matrix)
minnumberofblocks = min(3, length(iter)) # aim to show at least this many blocks
minnumberofblocks = clamp(length(iter), 1, 3) # aim to show at least this many blocks
truncateblocks = sum(cb -> min(size(cb[2], 1) + 2, minlinesperblock), iter; init = 0) > numlinesleft
maxnumlinesperblock = max(div(numlinesleft - 2 * truncateblocks, minnumberofblocks), minlinesperblock)
# aim to show at least minnumberofblocks, but not if this means that there would be less than minlinesperblock
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3 changes: 2 additions & 1 deletion test/tensors/tensors.jl
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Expand Up @@ -629,8 +629,9 @@ end
for V in (ℂ^2, Z2Space(0 => 2, 1 => 2), SU2Space(0 => 2, 1 => 2))
t1 = ones(Float32, V ⊗ V, V)
t2 = randn(ComplexF64, V ⊗ V ⊗ V)
t3 = randn(Float64, zero(V), zero(V))
# test unlimited output
for t in (t1, t2, t1', t2')
for t in (t1, t2, t1', t2', t3)
output = IOBuffer()
summary(output, t)
print(output, ":\n codomain: ")
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