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Razor View Engine : An expression tree may not contain a dynamic operation
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answered Nov 11 '10 at 19:28
marcindmarcind
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How to subtract a day from a date?
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edited Aug 26 '16 at 15:07
Flimm
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How to exit from PostgreSQL command line utility: psql
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Type \q and then press ENTER to quit psql.
UPDATE: 19-OCT-2018
As of PostgreSQL 11, the key...
How to tell if node.js is installed or not
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Open a terminal window.
Type:
node -v
This will display your nodejs version.
Navigate to w...
How to style dt and dd so they are on the same line?
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Ariel
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answered Nov 11 '09 at 4:44
eozzyeozzy
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Incrementing a date in JavaScript
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Three options for you:
1. Using just JavaScript's Date object (no libraries):
My previous ans...
How to sort mongodb with pymongo
...d", 1)
For multiple fields:
.sort([("field1", pymongo.ASCENDING), ("field2", pymongo.DESCENDING)])
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Can Json.NET serialize / deserialize to / from a stream?
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edited May 23 '17 at 12:34
Community♦
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answered Nov 16 '11 at 20:29
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ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.al
...in boolean context (by
calling __bool__ in Python3 or __nonzero__ in Python2).
Your original code
mask = ((r["dt"] >= startdate) & (r["dt"] <= enddate))
selected = r[mask]
looks correct. However, if you do want and, then instead of a and b use (a-b).any() or (a-b).all().
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