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导盲项目：什么场景非得用相机预览？按杖上按钮或定时拍照，识别后语音提醒...
...接.AfterPicking() {
if (蓝牙客户端1.Connect(列表选择器_连接.Selection)) {
计时器_蓝牙.TimerEnabled = true
标签_状态.Text = "导盲杖已连接"
}
}
when 计时器_蓝牙.Timer() {
if (蓝牙客户端1.IsConnected) {
if (蓝牙客户端1.BytesAvailableToReceiv...
Delete a line in Eclipse
...Visual Studio, you would use Ctrl + L , whereas in Eclipse I am forced to select a line or, if it is empty, go the beginning of the line before clicking delete/backspace.
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What is the Auto-Alignment Shortcut Key in Eclipse?
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Ctrl+Shift+F to invoke the Auto Formatter
Ctrl+I to indent the selected part (or all) of you code.
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Xcode 'Build and Archive' menu item disabled
...hive" menu item. For some strange reason when any kind of iOS Simulator is selected, Archive is greyed out.
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How to switch databases in psql?
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You can select the database when connecting with psql. This is handy when using it from a script:
sudo -u postgres psql -c "CREATE SCHEMA test AUTHORIZATION test;" test
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Extract every nth element of a vector
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To select every nth element from any starting position in the vector
nth_element <- function(vector, starting_position, n) {
vector[seq(starting_position, length(vector), n)]
}
# E.g.
vec <- 1:12
nth_element(vec, ...
Get element type with jQuery
...e type of an element with jQuery? For example, is the element a div, span, select, or input?
7 Answers
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Installed Ruby 1.9.3 with RVM but command line doesn't show ruby -v
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Open Terminal.
Go to Edit -> Profile Preferences.
Select the Title & command Tab in the window opened.
Mark the checkbox Run command as login shell.
close the window and restart the Terminal.
Check this Official Link
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Charts for Android [closed]
...oCharts. I attempted to evaluate a few others, but the links are broken. I selected MPAndroidChart because it has good docs and was able to get it imported into my project, and a working skeleton in a few minutes. HelloCharts and HoloGraphLibrary also look good. Although I had a bit of trouble insta...
find first sequence item that matches a criterion [duplicate]
...item. I was looking for a more generic solution to handle a wider scope of selection
– Jonathan
Mar 26 '12 at 9:38
but...