RAPTOR is a flowchart-based programming environment, designed specifically to help students visualize their algorithms and avoid syntactic baggage. RAPTOR programs are created visually and executed visually by tracing the execution through the flowchart. Required syntax is kept to a minimum. Students prefer using flowcharts to express their algorithms, and are more successful creating algorithms using RAPTOR than using a traditional language or writing flowcharts without RAPTOR.
Are you interested in running RAPTOR on Chromebooks, iPads, or just in a browser? Check out the pre-release here!. This is NOT fully tested. Send feedback via
A Multiplatform version of RAPTOR is now available for Windows, Mac and Linux built on top of [Avalonia]! See the downloads section below. Uses fonts from Noto Sans CJK for internationalization. Key differences:
Figure 1 RAPTOR for Windows
Figure 2 RAPTOR Avalonia
Papers on RAPTOR application:
RAPTOR referenced in following books or publications:
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For example, a system with a response time of 0.5s, throughput of 100 req/s, an error rate of 2%, and resource utilization at 80% would result in a . Key Benefits of Monitoring BIP
To determine the Barfi Index Patched for a specific environment, engineers use a weighted linear combination:
Use tools like Seobility for web-facing systems or TEXA IDC6 for industrial diagnostics to gather raw telemetry.
BIP=(RT×0.3)+(TP×0.25)+(ER×0.2)+(RU×0.25)cap B cap I cap P equals open paren cap R cap T cross 0.3 close paren plus open paren cap T cap P cross 0.25 close paren plus open paren cap E cap R cross 0.2 close paren plus open paren cap R cap U cross 0.25 close paren
The original Barfi Index was often criticized for being too sensitive to minor spikes in resource usage. The update introduces these specific weightings to ensure that high resource utilization doesn't negatively skew the index if the system is still delivering fast response times and high throughput.
By tracking the index over time, IT teams can predict when a system will reach its threshold before a total failure occurs.
Requests or transactions per second; accounts for 25%.
A sudden drop in the BIP score often signals that one specific variable (like error rate or response time) is dragging down the entire system, even if other metrics appear normal.
Percentage of failed requests; accounts for 20%.
The Barfi Index Patched is a comprehensive performance metric calculated by balancing several critical system variables. Unlike basic monitoring tools that might only track CPU load or uptime, the BIP integrates response times, throughput, and error rates into a single, actionable score. The BIP Calculation Formula
For example, a system with a response time of 0.5s, throughput of 100 req/s, an error rate of 2%, and resource utilization at 80% would result in a . Key Benefits of Monitoring BIP
To determine the Barfi Index Patched for a specific environment, engineers use a weighted linear combination:
Use tools like Seobility for web-facing systems or TEXA IDC6 for industrial diagnostics to gather raw telemetry. barfi index patched
BIP=(RT×0.3)+(TP×0.25)+(ER×0.2)+(RU×0.25)cap B cap I cap P equals open paren cap R cap T cross 0.3 close paren plus open paren cap T cap P cross 0.25 close paren plus open paren cap E cap R cross 0.2 close paren plus open paren cap R cap U cross 0.25 close paren
The original Barfi Index was often criticized for being too sensitive to minor spikes in resource usage. The update introduces these specific weightings to ensure that high resource utilization doesn't negatively skew the index if the system is still delivering fast response times and high throughput. For example, a system with a response time of 0
By tracking the index over time, IT teams can predict when a system will reach its threshold before a total failure occurs.
Requests or transactions per second; accounts for 25%. The update introduces these specific weightings to ensure
A sudden drop in the BIP score often signals that one specific variable (like error rate or response time) is dragging down the entire system, even if other metrics appear normal.
Percentage of failed requests; accounts for 20%.
The Barfi Index Patched is a comprehensive performance metric calculated by balancing several critical system variables. Unlike basic monitoring tools that might only track CPU load or uptime, the BIP integrates response times, throughput, and error rates into a single, actionable score. The BIP Calculation Formula
Do you want more older versions? Check out older versions of RAPTOR here
Did you know RAPTOR has modes? By default, you start in Novice mode. Novice mode has a single global namespace for variables. Intermediate mode allows you to create procedures that have their own scope (introducing the notion of parameter passing and supports recursion). Object-Oriented mode is new (in the Summer 2009 version)
RAPTOR is freely distributed as a service to the CS education community. RAPTOR was originally developed by and for the US Air Force Academy, but its use has spread and RAPTOR is now used for CS education in over 30 countries on at least 4 continents. Martin Carlisle is the primary maintainer, and is a professor at Texas A&M University.
Below handouts are by Elizabeth Drake, edited from Appendix D of her book, Prelude to Programming: Concepts and Design, 5th Edition, by Elizabeth Drake and Stewart Venit, Addison-Wesley, 2011. Linked here with author's permission.
Comments, suggestions, and bug reports are welcome. If you have a comment, suggestion or bug report, send an email to .
David Cox has put together a user forum at http://raptorflowchart.freeforums.org. This provides a place for users to exchange ideas, how tos, etc. Note however, that feedback for the author should be sent by email rather than posting on this forum.
Randy Bower has some YouTube tutorials at http://www.youtube.com/user/RandallBower. You can also search YouTube for "RAPTOR flowchart".
The UML designer is based on NClass, an open-source UML Class Designer. NClass is licensed under the GNU General Public License. The rest of RAPTOR, by US Air Force policy, is public domain. Source is found here. RAPTOR is written in a combination of A# and C#. Unfortunately, I don't have the time to provide support on compilation issues