The purpose of a vertical file is to organize and store a collection of documents, articles, and other materials on specific topics in an easily accessible manner. These files typically contain clippings, brochures, reports, and various ephemera related to particular subjects, making them valuable resources for research and information retrieval. Vertical files can be found in libraries, archives, and offices, serving as a quick reference tool for users seeking information on specific themes or issues.
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Log file analysis is not sufficient for this purpose.
Ans:The purpose of frange in DTFT.m is to set the range of frequency in order to observe spectra of the signal
Used for drawing horizontal lines. To support set squares when drawing vertical line and inclined lines.
There is no such thing as exactly vertical because either it is vertical or it is not. You cannot have approximately vertical - it is not vertical, then. Vertical means at 90 degrees to the horizon (or horizontal).
by moving vertical