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Boolean operators && and ||
...rter ones are vectorized, meaning they can return a vector, like this:
((-2:2) >= 0) & ((-2:2) <= 0)
# [1] FALSE FALSE TRUE FALSE FALSE
The longer form evaluates left to right examining only the first element of each vector, so the above gives
((-2:2) >= 0) && ((-2:2) <...
ModelState.AddModelError - How can I add an error that isn't for a property?
... in Create(FooViewModel fvm){...} to see if the fvm.prop1 and fvm.prop2 already exist in that combination; if so, I want to add an error to the modelstate, then return the whole view. I tried:
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Setting a system environment variable from a Windows batch file?
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answered Sep 27 '10 at 14:49
Hugh AllenHugh Allen
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How can I use Bash syntax in Makefile targets?
...ul, e.g. process substitution like in diff <(sort file1) <(sort file2) .
6 Answers
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Array initializing in Scala
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edited Jun 1 '11 at 12:09
answered Oct 7 '10 at 11:11
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UPDATE multiple tables in MySQL using LEFT JOIN
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UPDATE t1
LEFT JOIN
t2
ON t2.id = t1.id
SET t1.col1 = newvalue
WHERE t2.id IS NULL
Note that for a SELECT it would be more efficient to use NOT IN / NOT EXISTS syntax:
SELECT t1.*
FROM t1
WHERE t1.id NOT IN
(
S...
When should I use perror(“…”) and fprintf(stderr, “…”)?
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edited Aug 22 '16 at 20:11
Jonathan Lam
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Entity Framework - Add Navigation Property Manually
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2 Answers
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