filter() 和slice()函数可以按给定的逻辑条件筛选出符合要求的子数据集, 类似于 base::subset() 函数,但代码更加简洁, 同时也支持对同一对象的任意个条件组合(表示AND时要使用&或者直接使用逗号),返回与.data相同类型的对象。原数据集行名称会被过滤掉。 语法:filter(.data, ...) 举例1: #过滤出cyl == 8...
LMDB is a Btree-based database management library with an API similar to BerkeleyDB. The library is thread-aware and supports concurrent read/write access from multiple processes and threads. The DB structure is multi-versioned, and data pages use a copy-on-write strategy, which also provides ...
This is the Lightning Memory-Mapped Database (LMDB) extension for Tcl using the Tcl Extension Architecture (TEA). LMDB is a Btree-based database management library with an API similar to BerkeleyDB. The library is thread-aware and supports concurrent read/write access from multiple processes and...
the location of the Tk library is kept in the variable $tk_library. To access the procedures in the Tcl library, an application should source the file init.tcl in the library, for example with the Tcl com- mand source [file join [info library] init.tcl] If the library procedure Tcl_...
Desc {Principal Components Analysis, Tcl Decimal Arithmetic Library, tclrep, Math, Tcl Math Library, Symbolic differentiation for Tcl} Hidden Base @TAP_DIR@/math Path bessel.tcl Path bigfloat.tcl Path bigfloat2.tcl Path bignum.tcl Path calculus.tcl Path classic_polyns.tcl Path com...
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Standard Tcl commands carved out by the language library. User action Tcl commands to automate manual inputs in the design environment. Database Tcl commands for file storage and operations. Cadence extends the general Tcl/Tk script options with additional OrCAD X functionality specific to the platf...
Another advantage of using ActiveTcl on Linux is its extensive library of modules and extensions. ActiveTcl includes a wide range of libraries that provide support for tasks such as GUI development, network programming, and database access. These libraries make it easy for users to quickly build...
Step 2. Build the tclIndex for the "library". I use a Makefile with a convention like: install.index: (cd ${DESTDIR}/tclscripts/lib; \ echo 'source /usr/local/lib/tcl/init.tcl;\ auto_mkindex . *.tk' | tcl ; exit 0)
metakit 2.4.9.7.1 An embeddable database for storing data efficiently and portably, without requiring complex runtime installation. docs oracle-instantclient 12.2.0.1 Oracle Instant Client postgres 9.6.3 An object-relational database system. sqlite3 3.20.1 Tcl interface to the SQLite library. docs...