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Glossary

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<h2 id="glossary">Glossary</h2>

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<td style="text-align: left;">Active workspace</td>

<td style="text-align: left;">Workspace in which APL2 objects can be examined and expressions executed.</td>

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<td style="text-align: left;">Algorithm</td>

<td style="text-align: left;">Abstract description of a program. The description of a process or procedure.</td>

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<td style="text-align: left;">Argument</td>

<td style="text-align: left;">Array which is input to a function.</td>

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<td style="text-align: left;">Array</td>

<td style="text-align: left;">Rectangular collection of zero or more items arranged along zero or more axes. Each item in an array is a single number, a single character, or any other array.</td>

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<td style="text-align: left;">Assignment</td>

<td style="text-align: left;">Association of a name and an array.</td>

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<td style="text-align: left;">Attention signal</td>

<td style="text-align: left;">Request for a program to stop executing at the end of a line.</td>

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<td style="text-align: left;">One of the directions along which data is arranged.</td>

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<td style="text-align: left;">Boolean array</td>

<td style="text-align: left;">Array of <code>1</code>’s and <code>0</code>’s.</td>

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<td style="text-align: left;">Boolean function</td>

<td style="text-align: left;">Function which takes Boolean arguments a returns a Boolean result.</td>

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<td style="text-align: left;">Command</td>

<td style="text-align: left;">Line that begins with a right parenthesis.</td>

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<td style="text-align: left;">Constant</td>

<td style="text-align: left;">Object always associated with the same value, such as a number.</td>

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<td style="text-align: left;">Count</td>

<td style="text-align: left;">Number of items in an array.</td>

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<td style="text-align: left;">Defined function</td>

<td style="text-align: left;">Program used like a primitive function.</td>

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<td style="text-align: left;">Defined operator</td>

<td style="text-align: left;">Program used like a primitive operator.</td>

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<td style="text-align: left;">Defined sequence</td>

<td style="text-align: left;">Program used like a constant.</td>

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<td style="text-align: left;">Definition mode</td>

<td style="text-align: left;">State in which an expression entered becomes part of a program and is remembered for later evaluation.</td>

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<td style="text-align: left;">Depth</td>

<td style="text-align: left;">Degree of nesting of an array.</td>

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<td style="text-align: left;">Derived function</td>

<td style="text-align: left;">Function formed by the application of an operator to its operands.</td>

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<td style="text-align: left;">Dyadic function</td>

<td style="text-align: left;">Function applied to two arrays as arguments.</td>

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<td style="text-align: left;">Dyadic operator</td>

<td style="text-align: left;">Operator that applies to two operands.</td>

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<td style="text-align: left;">Empty array</td>

<td style="text-align: left;">Array that has zero items along at least one of its axes.</td>

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<td style="text-align: left;">Explicit result</td>

<td style="text-align: left;">Array produced by a function. It can be used as an argument of another function, assigned to a name, or displayed.</td>

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<td style="text-align: left;">Expression</td>

<td style="text-align: left;">Collection of symbols that can be evaluated to produce an array, a function, or an operator.</td>

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<td style="text-align: left;">External name</td>

<td style="text-align: left;">Operator, function, or array that can be used in an active workspace but which is defined outside the workspace.</td>

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<td style="text-align: left;">Function</td>

<td style="text-align: left;">Operation that applies to data and produces new data.</td>

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<td style="text-align: left;">Global variable</td>

<td style="text-align: left;">Variable whose value exists outside of any defined operation.</td>

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<td style="text-align: left;">Immediate execution mode</td>

<td style="text-align: left;">State in which an expression entered is immediately evaluated.</td>

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<td style="text-align: left;">Interrupt</td>

<td style="text-align: left;">Request for a program to stop executing immediately.</td>

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<td style="text-align: left;">Library</td>

<td style="text-align: left;">Collection of saved workspaces.</td>

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<td style="text-align: left;">Local variable</td>

<td style="text-align: left;">Variable defined only within some defined operation.</td>

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<td style="text-align: left;">Boolean vector used to control the application of a function.</td>

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<td style="text-align: left;">Matrix</td>

<td style="text-align: left;">Array with two dimensions.</td>

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<td style="text-align: left;">Monadic function</td>

<td style="text-align: left;">Function that in context is applied to one array as argument.</td>

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<td style="text-align: left;">Monadic operator</td>

<td style="text-align: left;">Operator that applies to one operand.</td>

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<td style="text-align: left;">Nested array</td>

<td style="text-align: left;">Array with at least one item which is not a simple scalar.</td>

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<td style="text-align: left;">Nested scalar</td>

<td style="text-align: left;">Array with no axes whose only item is not a simple scalar.</td>

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<td style="text-align: left;">Nested vector</td>

<td style="text-align: left;">Linear arrangement of data where at least one item is not a simple scalar.</td>

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<td style="text-align: left;">Operand</td>

<td style="text-align: left;">An array or function given to an operator as input.</td>

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<td style="text-align: left;">Operator</td>

<td style="text-align: left;">Operation that applies to functions and/or arrays and produces a new function as its result (called a derived function).</td>

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<td style="text-align: left;">Primitive</td>

<td style="text-align: left;">Function or operator defined as part of the APL2 language and always available—even in a clear workspace.</td>

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<td style="text-align: left;">Program</td>

<td style="text-align: left;">User-defined function, operator, or sequence.</td>

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<td style="text-align: left;">Number of axes of an array.</td>

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<td style="text-align: left;">Relational function</td>

<td style="text-align: left;">Function that performs comparisons.</td>

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<td style="text-align: left;">Row-major order</td>

<td style="text-align: left;">Listing of the items in an array that gives every item in row <code>I</code> before it gives any item in row <code>I+1</code>. Ravel lists items of an array in row-major order.</td>

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<td style="text-align: left;">Scalar</td>

<td style="text-align: left;">Array with zero axes.</td>

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<td style="text-align: left;">Scalar function</td>

<td style="text-align: left;">Function that applies independently to each simple scalar in its argument(s).</td>

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<td style="text-align: left;">Selective assignment</td>

<td style="text-align: left;">Assignment with a selection expression to the left of the left arrow.</td>

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<td style="text-align: left;">Shadowed name</td>

<td style="text-align: left;">Name of a global object which is hidden by a local object of the same name.</td>

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<td style="text-align: left;">Simple array</td>

<td style="text-align: left;">Array in which every item is a simple scalar.</td>

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<td style="text-align: left;">Simple scalar</td>

<td style="text-align: left;">Single number or single character of rank zero.</td>

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<td style="text-align: left;">Simple vector</td>

<td style="text-align: left;">Vector of simple scalars.</td>

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<td style="text-align: left;">State indicator</td>

<td style="text-align: left;">Place where the system keeps track of expressions and programs that have started execution but have not finished.</td>

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<td style="text-align: left;">Variable</td>

<td style="text-align: left;">Name with an array as its value.</td>

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<td style="text-align: left;">Vector</td>

<td style="text-align: left;">One-dimensional array.</td>

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<td style="text-align: left;">Vector notation</td>

<td style="text-align: left;">In the absence of functions or operators, two or more arrays written next to each other to form a vector of the values of the arrays.</td>

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<td style="text-align: left;">Workspace</td>

<td style="text-align: left;">Area of storage in main memory (active workspace) or in auxiliary storage (library workspace) that contains the definitions of variables and programs.</td>

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