Math. engine
The math. engine is a mandatory component for the frontend. It is used for all numerical evaluations, as well as formulas or functions interpretation. It relies on the [R] language, which is available through Rsession library, which holds many implementations:
- “true” R (3.5, 3.6 and 4.x), through Rserve (locally spawned automatically if necessary, fully compatible with legacy R),
- Renjin 3.5 (lower compatibility, but still very good),
- and default R2js, which is on-the-fly R translation to math.js, with lower compatibility but full BSD licence.
It is also possible to host this R+Rserve components on a remote machine, and to configure the frontend consistently using the R.server= key in Frontend configuration file.
For that purpose:
- [R] is available for following systems, in both 32 and 64 architectures :
- Windows
- Apple OS X
- Linux ((We recommend to use the previous repository of R-project, instead of your distro default one. Usually, the common Linux distributions are not up-to-date and lead to some incompatibility.))
- proceed with Rserve installation, one of these ways:
- automatically at first startup of Funz (regular way)
- manually using
install.packages("Rserve")
command from your R environment previously installed (internet connection needed) - manually with the installation archive and then using some
install.packages("C:\tmp\Rserve_1.8-xxx.zip", repos=NULL)
command from R environment (internet connection NOT needed)
Alternatively, using Linux you can try the apt or yum packages manager, but take care that you must use a recent enough version of Rserve.
Once R+Rserve are installed on a erver, you can setup basic scripts:
- ‘/opt/Rserve/Rserved’:
#!/bin/bash echo " * Starting Rserve ..." start-stop-daemon --start --chuid myuser --exec /opt/Rserve/Rserve.sh > /tmp/Rserve.log 2>&1 & echo " * Rserve is running." exit
- ‘/opt/Rserve/Rserve.sh’:
#!/bin/bash /usr/bin/R CMD /usr/lib/R/bin/Rserve --vanilla --RS-conf /opt/Rserve/Rserve.conf
- ‘/opt/Rserve/Rserve.conf’:
remote enable fileio enable
- and then enable at startup: ‘‘ln -s /opt/Rserve/Rserved /etc/rc2.d/S99Rserve’’
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