大约有 20,000 项符合查询结果（耗时：0.0396秒） [XML]
Select rows of a matrix that meet a condition
...,'B'] == 5)]
aux = aux[which(Mat[aux,'C'] > 2)]
Mat[aux, ]
By testing the speed advantage with system.time, the which method is 10x faster than the subset method.
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Facebook Graph API v2.0+ - /me/friends returns empty, or only friends who also use my application
...ally authorized your app using the user_friends permission). This has been confirmed by Facebook as 'by design'.
For apps wanting allow people to invite friends to use an app, you can still use the Send Dialog on Web or the new Message Dialog on iOS and Android.
UPDATE: Facebook have published an ...
Why specify @charset “UTF-8”; in your CSS file?
...encoding.
MDN: @charset. There is a support table. I do not trust this. :)
Test case from the CSS WG.
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How to add many functions in ONE ng-click?
... Option 1 also gives you one more unnecessary function to have to test
– Parris Varney
Aug 11 '16 at 20:52
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How can I assign the output of a function to a variable using bash?
...will accept any options that the declare builtin will accept. from a quick test, it also looks as if declare -n in a function scope also gives the variable local scope. it seems they are interchangeable here.
– init_js
Sep 6 '17 at 19:58
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How to add title to subplots in Matplotlib?
...range(len(ax)):
for j in range(len(ax[i])):
## ax[i,j].imshow(test_images_gr[0].reshape(28,28))
ax[i,j].set_title('Title-' + str(i) + str(j))
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How does TransactionScope roll back transactions?
I'm writing an integration test where I will be inserting a number of objects into a database and then checking to make sure whether my method retrieves those objects.
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Using CSS to insert text
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Initial tests indicate the content-property works well. Congrats on finding an answer when everyone else says it can't be done. :)
– abelenky
Apr 29 '10 at 23:18
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Sequence contains no matching element
...row an exception if it can't find any matching elements. Given that you're testing for null immediately afterwards, it sounds like you want FirstOrDefault(), which returns the default value for the element type (which is null for reference types) if no matching items are found:
var documentRow = _d...
Select 50 items from list at random to write to file
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I used this to easily create a test / train set for a machine learning project. Using random.choice(mylist,3) wouldn't create two disjoint sets as this did.
– Monica Heddneck
Jul 31 '17 at 23:38
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