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Do not fail on empty maps #974

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Merged
keskitalo merged 1 commit into from
Sep 14, 2026
Merged

Do not fail on empty maps #974

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10 changes: 8 additions & 2 deletions src/toast/scripts/toast_healpix_coadd.py
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Original file line number Diff line number Diff line change
Expand Up @@ -38,10 +38,13 @@ def load_map(fname, prefix="", cache=None, dtype=np.float64):
log.info(prefix + f"Loading {fname} from cache")
m, good, npix = cache[fname]
m = m.copy() # Avoid modifying the contents of the cache later
if len(m.shape) != 2:
if m.size == 0:
nmap, ngood = 0, 0
elif len(m.shape) != 2:
msg = f"Cached map '{fname}' does not have the right dimensions: {m.shape}"
raise RuntimeError(msg)
nmap, ngood = m.shape
else:
nmap, ngood = m.shape
else:
log.info(prefix + f"Loading {fname}")
try:
Expand Down Expand Up @@ -347,6 +350,9 @@ def main(
inmap, nnz_test, npix_test, good = load_map(
infile_map, prefix=prefix, cache=cache, dtype=np.float64,
)
if len(good) == 0:
# An empty map -- nothing to co-add
continue
if nnz is None:
nnz = nnz_test
npix = npix_test
Expand Down
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