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A language and a compiler for the solution of differential equations (ODE). Both lumped and distributed variables (PDE) will be possible. The ability to solve DAEs is a long term goal. The compiler generates a Python program that does the. The Best Free GPS Software app downloads for Mac: DePN Manager Mac WPS HoudahGPS Adze MacTopos Texas myTracks TrailRunner Garmin ANT Agent. Download gpss student version for free. System Utilities downloads - Kelk by SinaSoft and many more programs are available for instant and free download. Native GUI (Qt) for Windows, Mac OS X and Linux. Free software (GPLv3 open-source license). GPXSee is designed as a small (no dependencies except of Qt), fast and uncomplicated GPS data/map viewer, not a full featured GIS software.

What is GPXSee?

GPXSee is a GPS log file viewer and analyzer that supports all common GPS log file formats.

Key features

  • Opens GPX, TCX, FIT, KML, NMEA, IGC, CUP, SIGMA SLF, Suunto SML, LOC, GeoJSON, OziExplorer (PLT, RTE, WPT), Garmin GPI & CSV and geotagged JPEG files.
  • User-definable online maps (OpenStreetMap/Google tiles, WMTS, WMS, TMS, QuadTiles).
  • Offline maps (OziExplorer maps, TrekBuddy maps/atlases, Garmin IMG/GMAP & JNX maps, TwoNav RMaps, GeoTIFF images, MBTiles).
  • Elevation, speed, heart rate, cadence, power, temperature and gear ratio/shifts graphs.
  • Support for DEM files (SRTM HGT).
  • Support for POI files.
  • Print and export to PNG and PDF.
  • Multiple tracks in one view.
  • Full-screen mode.
  • HiDPI/Retina displays and maps support.
  • Native GUI (Qt) for Windows, Mac OS X and Linux.
  • Free software (GPLv3 open-source license).

GPXSee is designed as a small (no dependencies except of Qt), fast and uncomplicated GPS data/map viewer, not a full featured GIS software. However, the spectrum of supported data files/map sources is relatively rich, see the Documentation section for details.

Getting GPXSee

Additionally to the source codes, GPXSee is available as a Windows installer and an OS X dmg from the project's Sourceforge page and in form of various Linux packages from the project's openSUSE Build Service page. Most Linux distributions (Archlinux, Fedora, Gentoo, openSUSE, ...) as well as BSD distributions (FreeBSD, NetBSD, OpenBSD) also provide GPXSee in their official repositories, however not always in the latest version.

On OS X you can also use the MacPorts or Homebrew packaging systems to install GPXSee.

The official Windows & OS X installers are always signed using certificates available at the GitHub project page. As the certificates are non-commercial (self-signed) you have to import the certificate on Windows first if you want your OS automatically check the installer when installing GPXSee. On OS X, Apple does not allow software that does not generate them profit like GPXSee to pass OS X's Gatekeeper (you can't import custom certificates) so you need to run the application using the 'right click menu' when opening it for the first time.

Online maps

GPXSee supports most tile server based online maps out there, but the list of map definitions distributed with the official packages is limited to a small set of well known global map services. You may however easily extend (or change) the default map list with your own map definitions.

There is a community driven GPXSee maps repository on GitHub where you can find a lot of additional map definitions for various map services, usually run by some state geographic institution or a non-profit organization.

Reporting bugs

If you have found a bug in GPXSee, please report it using the GitHub issue tracker. Bugs that are not reported can not be fixed! If you are missing some feature in GPXSee, you may also use the tracker to request it.

Bad/missing translations can be fixed directly on the projects Weblate page.


General Purpose Simulation System (GPSS) is a discrete timesimulationgeneral-purpose programming language, where a simulation clock advances in discrete steps. A system is modelled as transactions enter the system and are passed from one service (represented by blocks) to another. It is used primarily as a process flow oriented simulation language;[1] this is particularly well-suited for problems such as a factory.


GPSS was developed by IBM's Geoffrey Gordon at the beginning of the 1960s. He named it Gordon's Programmable Simulation System. The name was changed when IBM decided to release it as a product.[2]

The 'General Purpose' part of the new name was to create a standard in waiting-line simulations.


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The original releases were for IBM's 7044 & 7090 mainframes. Subsequently,there were releases for IBM 360,[3]Univac 1108 and CDC.[4][5][6]

Over time, other implementations, in other languages and targeted at different size systems, were developed, including DEC's VAX, a specialized APL version for large-scale Univac systems,[7] and Macintosh, among others.[8]


JGPSS (Java General Purpose Simulation System) is a Java-based tool that was developed to teach the GPSS simulation language.[2][9]

Language description[edit]

GPSS resembles a LEGO structure where blocks are chosen by the modeller for specific functions to imitate a particular system.[10]

The language is neither procedural, object-oriented or functional programming. The world is simulated with entities moving through the model.[11] These entities, called Transactions, are envisioned as moving from Block to Block, where a Block is a line of code and represents unit actions that affects the Transaction itself or other entities.

Blocks can be facility-oriented (such as machines in a job shop) or transaction-oriented (such parts of work-in-process, signals in electronic components or documents in a bureaucratic procedure). GPSS automatically keep track of statistics which brings in fixed form at the end of a simulation as standard report. GPSS is one of the oldest language candidate of first object-oriented approach because while transactions are truly instances of model objects, blocks are methods in the modern concept of OOP.

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Entities can be broadly classified in Resources, Computational entities and Statistical entities.[11] Resources, like Facilities and Storages represent limited capacity resources. Computational entities, like Ampervariables (variables), Functions and random generators are used to represent the state of Transactions or elements of their environment. Statistical entities, like Queues or Tables (histograms) collect statistical information of interest.

Sample code[edit]

The following example, taken from Simulation using GPSS,[12] is the 'Hello world!' of GPSS and will illustrate the main concepts.

The aim is to simulate one day of operation of a barber shop. Customers arrive in a random constant flow, enter the shop, queue if the barber is busy, get their hair cut on a first-come first-served basis, and then leave the shop. We wish to know the average and maximum waiting line, as well as the number of customers.

The 'program' is comprised between the SIMULATE and END statements, and is divided into 'model segments' and 'control cards'.

The first segment models customers. The GENERATE block creates a flow of Transactions and schedules them to enter the model with an inter-arrival time uniformly distributed over the range 18±6. It is the programmer's responsibility to interpret these transaction as customers and to understand that the time is to be counted in minutes. The Transactions start their existence in the GENERATE block and progress from Block to Block, according to certain rules, until they reach a TERMINATE which remove them from the model.

Normally transactions progress from one block to the next one, so the customer transactions will leave the GENERATE block to enter the QUEUE Chairs block. This block simulates a waiting line, and collects statistics accordingly. In the example, it materialize a line of chairs and, at the end of the simulation, we will know, among other things, the maximum queue size (how many chairs are needed) and the average waiting time. The QUEUE block requires the name of the queue as a parameter, because more than one queue may exist in the model. Each one is associated with a DEPART block, which is triggered when the transaction leaves the queue. GPSS remembers which transactions are in the queue, so that it possible to know the average time spent, and to check that no buggy transaction is leaving a queue without previously entering in it.

After the QUEUE chairs block, the transaction will try to proceed to the SEIZE Joe block, a block simulating the capture of the Facility named Joe. Facilities model single servers of capacity one. If the facility is busy, the SEIZE will deny the attempting transaction the right to enter. In the example, the customer will wait in the QUEUE block. If it is free, or as soon as it becomes available, the transaction will be allowed to capture the facility, mark it as busy to others transactions and start to count the service time and other statistics, until the same transaction passes the corresponding RELEASE Joe block.

The SEIZE / RELEASE pairs are linked by the facility name, because many independent facilities may exist in the model. They can model operators, like a barber, a repairman, an agent, but also pieces of equipment, like a crane, a gas station, an authorization document, etc., in fact anything with capacity one. To simulate multiple parallel servers, like a team of five barbers, or an oven with a capacity of 10, GPSS uses entities named STORAGEs.

After a customer seizes Joe, she proceeds to the next statement which is ADVANCE 16,4, whose task is to freeze the entity for a prescribed length of time, here a random number picked between 16-4=12 and 16+4=20mn. Other service time distributions are available through GPSS FUNCTION (a somehow different notion than function in other programming languages). During that time, other transactions will be allowed to move through the model, blocking some other facilities that may exist in the model, but not Joe because this facility is busy with the frozen customer. After the prescribed time, the customer will wake up, proceed to the next statement, which will free Joe, and TERMINATE.

Then the next transaction on the previous block, that is a customer sitting on a chair, will be able to SEIZE Joe. To select the 'next' transaction, GPSS uses the first-come first-served basis, with priority. Other selection policies can be programmed by direct manipulation of the future event chain entity.

In parallel to this first segment, simulating the customer behavior, a second model segment simulates the end of the day. At time 480mn = 8h an entity is GENERATEd, which will TERMINATE on the next block. This time, the TERMINATE as a parameter of 1, meaning a special counter is decreased by 1. When that counter reaches 0, the program stops and the output is printed. This special counter is set up with the START statement. In the example, it is set to one, thus the simulation will finish after one run of 480 mn in simulated time.

The output contains:

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It indicates that Joe was busy 86.0% of the time, gave a hair cut to 26 customers and that hair cut took 15.88 minutes on the average. Incidentally, Joe was cutting the hair of customer number 26 when the simulation was closed. No programming provisions were taken for the barber to finish the hair cut before closing the shop.

It indicates also that a maximum of 1 customer was observed waiting his turn, in fact the number of waiting customer was on the average 0.160. A total of 27 customers did enter the queue, so that customer number 27 was still sitting, waiting his turn, when Joe closed the shop. Out of these 27 customers, 12 were served without having to wait. In fact, the queue was empty 44.4% of the time. The average waiting time was 2.851 min, and the average waiting time for the 15=27-12 customers who did really wait was 5.133 min.

See also[edit]

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  1. ^Arne Thesen; J. William Schmidt (2014). Computer Methods in Operations Research. ISBN978-1483260747. GPSS is a process flow oriented simulation language
  2. ^ abP. Fonseca Casas (2009). 'jgpss, an open source gpss framework to teach simulation'(PDF). simplify the development of a complete simulation tool following the GPSS syntax. This paper presents ... In the original, GPSS meant Gordon's Programmable Simulation System, in honor of Geoffrey Gordon, its creator.
  3. ^(GPSS/360, on MFT/MVT but not DOS)
  4. ^D. C. Div (1968). 'Technical Note'. IEEE Transactions on Systems Science and Cybernetics. 4 (4): 446–447. doi:10.1109/TSSC.1968.300174. IBM has available GPSS III for the 7044 and 7090 series and GPSS/360 for the larger 360 ... GPSS II has also been available on the UNIVAC 1108
  5. ^'Introduction to GPSS'(PDF). about the simulation modeling language GPSS. ... summarized; sources comparing GPSS and other .... Corporation's GPSS for Univac 1108 hardware)
  6. ^B. Liskov (1981). 'GPSS Session'. History of Programming Languages. ScienceDirect. pp. 403–437. doi:10.1016/B978-0-12-745040-7.50013-2. ISBN9780127450407. Background: The General Purpose Simulation System (GPSS) is a ... manufacturers that have produced versions of GPSS are UNIVAC (Gorchow, 1968), CDC
  7. ^Nabil R. Adam; Ali Dogramaci (2014). Current Issues in Computer Simulation. p. 25. ISBN978-1483258034. GPSS-like ... in the APL version of GPSS, although APL happens to be an interpretive language. ... Univac Corporation, GPSS 1100 for UNIVAC 1108 system.
  8. ^Introduction to Simulation With Gpss on the Pc, MacIntosh and Vax. ISBN0-1348-323-10.
  9. ^'Java General Purpose Simulation System'. Learn simulation building a simulation engine. JGPSS is an implementation of the GPSS system based in Java.
  10. ^'GPSS 50 years old, but still young'. August 1, 2018. In 2011, GPSS, the General Purpose Simulation System, ... class room the students can study a very simple Lego railroad model
  11. ^ abStanley Greenberg (1972). GPSS Primer. New York: Wiley-Interscience. ISBN0471324906.
  12. ^Schriber, Thomas (1974). Simulation using GPSS. Wiley. ISBN9780471763109.

External links[edit]

  • Wolverine Software GPSS/H version
  • Minuteman Software, a company that provides some implementations
  • JGPSS Java General Purpose Simulation System.
  • GPSS360 Online GPSS360 - Descendant of the original GPSS

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