大约有 45,000 项符合查询结果(耗时:0.0424秒) [XML]

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Is bool a native C type?

...C90. Here's a list of keywords in standard C (not C99): auto break case char const continue default do double else enum extern float for goto if int long register return short signed static struct switch typedef union unsigned void volatile while Here's an article discussing some other differen...
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Remove outline from select box in FF

Is it possible to remove the dotted line surrounding a selected item in a select element? 12 Answers ...
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Aggregate / summarize multiple variables per group (e.g. sum, mean)

...-date), sum) # summarising a specific set of non-grouping variables using select_helpers # see ?select_helpers for more options df2 <- df1 %>% group_by(year, month) %>% summarise_at(vars(starts_with('x')), sum) df2 <- df1 %>% group_by(year, month) %>% summarise_at(vars(matches('.*...
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Getting value of select (dropdown) before change

The thing I want to achieve is whenever the <select> dropdown is changed I want the value of the dropdown before change. I am using 1.3.2 version of jQuery and using on change event but the value I am getting over there is after change. ...
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In Ruby, is there an Array method that combines 'select' and 'map'?

... I usually use map and compact together along with my selection criteria as a postfix if. compact gets rid of the nils. jruby-1.5.0 > [1,1,1,2,3,4].map{|n| n*3 if n==1} => [3, 3, 3, nil, nil, nil] jruby-1.5.0 > [1,1,1,2,3,4].map{|n| n*3 if n==1}.compact => ...
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CSS triangle custom border color

...areful about copypasta out of JSFiddle, it added two invisible and invalid characters into my CSS file that caused validation/parse errors in that css file. Once I removed the invisible characters (the chars were zero width, so cursor wasn't showing them, but I was able to backspace) it worked wonde...
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Replace all 0 values to NA

... but what if in the columns 6 and 7 - the datatype is char and no replacement should be done. In my problem, I need replacement only in columns 12 to 15 but the whole df has 21 columns (many must not be touched at all). – userJT Feb 20 '15 ...
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Index of Currently Selected Row in DataGridView

It's that simple. How do I get the index of the currently selected Row of a DataGridView ? I don't want the Row object, I want the index (0 .. n). ...
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Get the week start date and week end date from week number

...y other weird value to test it */ DECLARE @d DATETIME SET @d = GETDATE() SELECT @d ThatDate, DATEADD(dd, 0 - (@@DATEFIRST + 5 + DATEPART(dw, @d)) % 7, @d) Monday, DATEADD(dd, 6 - (@@DATEFIRST + 5 + DATEPART(dw, @d)) % 7, @d) Sunday ...
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Find column whose name contains a specific string

... # select columns containing 'spike' df.filter(like='spike', axis=1) You can also select by name, regular expression. Refer to: pandas.DataFrame.filter ...