Sequential file

REWIND(list of specifiers) — Causes a sequential file to be rewound to... 

BACKSPACE(list of specifiers) — Causes a sequential file to rewind one record ENDFILE(list of specifiers) — Places an end-of-file mark on a sequential... 

File—Composed of elements (which may be records or other data structures) of the same type sequential files only in standard Wirth Pascal external (physical) files (for input and output) must be declared with the program heading (see Statements ) and internal (temporary) files may be added for use within the program all files except INPUT and OUTPUT must be declared in TYPE and/or VAR sections. 

Data Resource Files allow the user to access all pertinent data as needed, reducing the need for programmer support or hard code to access specialized variables. The data storage format is very user friendly in that if a user wishes to make changes, he can comment fields as desired and does not need to worry about a formatted sequential file sti ucture. 

Overview. Figure 10 shows, in simplified form, the activities, inputs and outputs involved in running HSPF, from a typical user s point of view. The first phase involves copying input time series, such as meteorological data, from sequential files (cards, tape, disc) to the Time Series Store (TSS). This is sometimes done in a single run but in most practical situations, where data have to be gathered from diverse sources and gaps have to be patched, several runs are made. 

In the second phase the input time series for simulation, data display and analysis runs usually come from the TSS, although they can sometimes be obtained directly from sequential files, thus bypassing the first phase described above. The other type of input, required in all HSPF runs, is called the User s Control Input. 

We use formatted sequential files because these are the simplest... 

VT105 in that it is a richer command set and is a simple ASCII stream, it can be easily read with out resorting to decoding the bit patterns of characters. Graphics figures can be stored as simple sequential files, edited with a standard editor and transported between system (ours or other vendors) without worrying about the oddities of binary file structures and data being interpreted as control codes. ... 

Type in Program 1, Quiz Generator, and save it on a new disk. You ll be using Quiz Generator to generate sequential files, which can use up disk space rather quickly, so it s best to start with a fresh disk., ... 

Press the 1 key to enter new questions and create a quiz. You ll then be asked if a file of quiz names exists. If this is the first time you ve used the program or if you re starting a new group of tests on a new disk, answer by hitting N. Next, provide a name for your quiz. The quiz name is stored in a SEQuential file called TEST TITLES. Quiz Generator accepts up to 15 quiz files for each disk (a limitation because of the menu s screen formatting). If you re covering more than one subject, you may want to have a separate disk for each—for... 

H Output The matrix of one-electron int rals. nfile Input The logical channel number of a (sequential) file on which the electron-repulsion integrals are to be placed. 

This level of RAID is similar in concept to RAID level 3, but emphasizes performance for different applications, e.g., database files vs large sequential files. Another difference between the two is that RAID level 4 has a larger stripe depth, usually of two blocks, which allows the RAID management software to operate the disks more independently than RAID level 3 (which controls the disks in unison). This essentially replaces the high data throughput capability of RAID level 3 with faster data access in read-intensive applications. (See Fig. 14.10.)... 

All CAD I neutral file follow the envelope concept. The beginning and the end of the neutral file is clearly marked inside a larger CAD I metafile. The metafile may carry additional information such as letters, FORTRAN source code, even CAD information according to some other standard such as IGES, VDA-FS, or SET. No conflict arises between these different files even when they are transported as one sequential file on magnetic tape or computer network. 

The physical layer of the CAD I neutral file for solids describes how the CAD system data structures are mapped onto a sequential file. There are several levels of regarding the same sequential file ... 

On the physical level we are concerned with the exchange of sequential files between computers. The content of the sequential files is irrelevant on this level. 

Any protocol that allows the transfer of sequential files may be used to communicate a CAD I neutral file from one computer to another. No restrictions are made with respect to block lengths. 

According to the CAD I project conventions, all neutral files consist of card image format sequential files. This means that they may be considered as a sequence of logical records of 80 bytes length where each byte contains the binary representation of the decimal coded alphabet. All CAD I metafiles have a common format. 

LUI - The logical unit associated with the native data base or native sequential file. 

Biology Retrieval Subsystem. The biology retrieval subsystem consists of two indexed sequential files containing biological test data relating to the structures of the chemistry subsystem. There are over three million records occupying 6 disk packs of 37 million characters each. Both files are sequenced by sample number (BN) and laboratory identification number (Lab I.D.). The data fields are dependent on the type of experimentation done by a specified laboratory and are predefined in a data neune dictionary. From a user s point of view the two files... 

Inventory Retrieval Subsystem. The inventory retrieval subsystem is an indexed sequential file containing information pertinent to the physical samples. It currently contains 433 thousand records and occupies 5 disk packs of 37 million characters each. The file is maintained in sample number sequence. When a sample is received it is assigned the next availaible sample number and all available data (i.e., date of receipt, source, amount, condition of receipt, shelf location, chemical and physical properties, etc.) are entered into the record. All transactions involving that sample (shipments to testing Icib-oratories, removal from inventory, etc.) and the date of the transactions are also entered into record. The data fields for this file are also predefined in a data name dictionary for searching. 

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