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terminology - What does it mean when data is scalar? - Software . . . The term "scalar" comes from linear algebra, where it is used to differentiate a single number from a vector or matrix The meaning in computing is similar It distinguishes a single value like an integer or float from a data structure like an array This distinction is very prominent in Perl, where the $ sigil (which resembles an 's') is used to denote a scalar variable and an @ sigil (which
What are the scalar fields and composite fields in JAVA? The terms 'scalar type' or 'scalar field' are usually used to contrast them with compound types fields A compound type is easiest to define and it is a type that contains multiple distinct elements These elements can have the same type, in which case the compound is an array or a list, or different types, in which case the compound is typically a struct or a class A scalar type is a type
Strategy for storing mixed value and reference types without boxing In C++ this could be an array of union of scalar and pointer types, but that strategy is unavailable (or at least highly unsafe) in NET This is a place where I really don't need a GC (object destruction is deterministic), so calling out to unmanaged code is a possibility
What is meant by a primitive data type? It kind of depends on the language For example, in languages like C and C++, you have a number of built-in scalar types - int, float, double, char, etc These are "primitive" in the sense that they cannot be decomposed into simpler components From these basic types you can define new types - pointer types, array types, struct types, union types, etc Then you have a language like old-school
matlab - Plotting electrical field lines on a 2d plane - Software . . . This question is ambiguously defined Electrical field lines (as referenced in the title) are not the same as equipotential lines Specifically the electric field E followed by electric field lines is related to the electric potential field V by E = −∇V In the case of electrical potential, this is a scalar field so equipotential lines are simply contours of constant value of that field