N2 chart

Engineering Practices]. July 2000.</ref>]] The N ² chart, also referred to as N ² diagram, N-squared diagram or N-squared chart, is a diagram in the shape of a matrix, representing functional or physical interfaces between system elements. It is used to systematically identify, define, tabulate, design, and analyze functional and physical interfaces. It applies to system interfaces and hardware and/or software interfaces.

The N-squared chart was invented by the systems engineer Robert J. Lano, while working at TRW in the 1970s and first published in a 1977 TRW internal report.

Overview

The N² diagram has been used extensively to develop data interfaces, primarily in the software areas. However, it can also be used to develop hardware interfaces. The basic N² chart is shown in Figure 2. The system functions are placed on the diagonal; the remainder of the squares in the N × N matrix represent the interface inputs and outputs.

Chart

A chart, also called a graph, is a graphical representation of data, in which "the data is represented by symbols, such as bars in a bar chart, lines in a line chart, or slices in a pie chart". A chart can represent tabular numeric data, functions or some kinds of qualitative structure and provides different info.

The term "chart" as a graphical representation of data has multiple meanings:

Charts are often used to ease understanding of large quantities of data and the relationships between parts of the data. Charts can usually be read more quickly than the raw data that they are produced from. They are used in a wide variety of fields, and can be created by hand (often on graph paper) or by computer using a charting application. Certain types of charts are more useful for presenting a given data set than others. For example, data that presents percentages in different groups (such as "satisfied, not satisfied, unsure") are often displayed in a pie chart, but may be more easily understood when presented in a horizontal bar chart. On the other hand, data that represents numbers that change over a period of time (such as "annual revenue from 1990 to 2000") might be best shown as a line chart.

Chart (disambiguation)

A chart is a graphical representation of data.

Chart may also refer to:

Chart Attack

Chart Attack is a Canadian online music publication. Formerly a monthly print magazine called Chart, which was published from 1991 to 2009, the web version continues operation.

Launched in 1991 as National Chart, the magazine was started by York University students Edward Skira and Nada Laskovski as a tipsheet and airplay chart for campus radio stations in Canada. The magazine soon grew to include interviews, CD reviews and other features. National Chart was considered an internal publication for the National Campus and Community Radio Association, Canada's association of campus radio stations, and was not available as a newsstand title.

When Skira and Laskovski graduated, they incorporated Chart as an independent magazine, and began to pursue national newsstand distribution. Although it was no longer an NCRA publication, many campus radio stations continued to file airplay reports for the magazine's Top 50 chart.

The magazine's primary focus was Canadian alternative rock and indie rock, although they profiled important international acts, and rap and pop music acts as well. At its peak, the magazine had a press run of 40,000 copies per issue, making it the largest paid circulation music magazine in Canada in its era.