Diagram

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diagram

Maths a pictorial representation of a quantity or of a relationship

diagram

A plan, sketch, drawing, chart or graph, not necessarily representational, that explains, demonstrates or clarifies the arrangement and relationship of the parts to a whole.
See also: Design drawing

Diagram

 

in botany, a graphic representation of the shape, number, and location of the parts of a flower or leafy shoot by projecting them on a horizontal surface. The diagram of a flower is made on the basis of one or several transverse sections of the bud. Using conventional symbols, the diagram of a flower may show only the parts visible in a cross section (an empirical diagram of the flower) or it may also show not-yet-developed parts or parts that have disappeared (a theoretical diagram of the flower, based on the study of many empirical diagrams). The diagram of a shoot is based on a schematic representation of a transverse section through the vegetative bud.


Diagram

 

in design documentation, a document showing in conventional notation the components of an article or installation and the connections or links between components. Diagrams are usually drawn without regard to scale or to the actual spatial arrangement of the components. They may be classified according to the type of components and connections between components as electrical, pneumatic, hydraulic, kinematic, or combination diagrams. They may also be classified according to the purpose for which they will be used.

Block diagrams that define each principal working component of an article or installation and the component’s purpose and interconnections are developed concurrently with the design of the article, before any other type of diagram; they are used in studying the article’s structure and functioning and are referred to when the article is in actual use.

Functional diagrams showing the processes that occur within an article and within individual components are used in studying the functional capabilities of the article, as well as in installation, adjustment, control, and repair work.

Schematic diagrams define the components of the article that constitute a complete set and the interconnections between components; they usually give a detailed representation of the working principle of the article and may serve as a basis for developing other design documents, such as electrical installation blueprints and specification sheets.

Circuit diagrams show connectors between components and the locations of connectors and lead-ins; such diagrams also illustrate methods of laying out, mounting, and fastening conductors, cables, and piping. Others show external connections to other articles; such diagrams are used for the installation and operation of complex units. Diagrams showing the principal parts of a complex and the interconnections between subassemblies when the complex is installed and operated are designed primarily to give a general representation of the complex. Layout diagrams show the relative spatial arrangement of components.

In the USSR the procedure for drawing up diagrams is established by State Standards (GOST).

V. N. KVASNITSKII

diagram

[′dī·ə‚gram]
(computer science)
A schematic representation of a sequence of subroutines designed to solve a problem; it is a coarser and less symbolic representation than a flow chart, frequently including descriptions in English words.
(graphic arts)
A line drawing that represents an object or area according to a scale.
A graph which shows the relation between two variables or which plots the occurrence of events or objects as a function of two variables.
(mathematics)
A picture in which sets are represented by symbols and mappings between these sets are represented by arrows.
References in classic literature ?
There is one somewhere; I heard it," said Miss Ward carelessly, unrolling her diagrams, which she began to explain without further parley.
It was scrawled over with geometrical diagrams and calculations of some sort.
Hideous coloured diagrams of the ravages of hideous diseases decorated the barren buff-coloured walls.
They had their red guide-books open at the diagram of the view, and were painfully picking out the several mountains and trying to impress their names and positions on their memories.
Again, when I am in the company of one of my two hexagonal Grandsons, contemplating one of his sides (AB) full front, it will be evident from the accompanying diagram that I shall see one whole line (AB) in comparative brightness (shading off hardly at all at the ends) and two smaller lines (CA and BD) dim throughout and shading away into greater dimness towards the extremities C and D.
Here is a popular scientific diagram, a weather record.
At first, no result at all crowned my efforts, though I 'divided my swift mind,' now hither, now thither, in a way that I felt sure would have made AEneas green with envy: but the dimly-seen oval remained as provokingly blank as ever--a mere Ellipse, as if in some mathematical diagram, without even the Foci that might be made to do duty as a nose and a mouth.
The first thing referred to by the sheriff was the diagram of a compass, cut in one corner of the slate for permanent use.
The black bodies of the trees formed a straight wall on both sides, terminating on the horizon in a point, like a diagram in a lesson in perspective.
A large hop-scotch diagram is marked out on the deck with chalk, and each compartment numbered.
We have such exorbitant eyes that on seeing the smallest arc we complete the curve, and when the curtain is lifted from the diagram which it seemed to veil, we are vexed to find that no more was drawn than just that fragment of an arc which we first beheld.
He took the book, open at a diagram of the dissected part, and looked at what they had to find.