This is the command viper that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
Viper - the simple FEniCS run-time plotter
SYNOPSIS
viper [OPTIONS]
DESCRIPTION
Viper is a minimalistic scientific plotter and run-time visualization module. Some its the
features includes:
* Light-weight and minimalistic
* Extended keybindings
* Interactive
* Save as png, VTK
* 2D and 3D
* Scalar, vector, and displacement fields
* Multiple input formats
* In PyCC mode; direct plotting of NumPy arrays over DOLFIN meshes
* Can be used as standalone plotting application, or used as part of
PyDOLFIN
OPTIONS
-h, --help
Display help text and exit.
-i file, --input file
Specify input file.
-o file, --output file
Specify output file.
-l lut file, --lut lut file
Specify lookup table (LUT) file.
-d data file, --data data file
Specify data file.
EXAMPLE
Viper has support for visualizing meshes and solutions in DOLFIN:
from dolfin import *
# Plot a mesh
mesh = UnitCube(16, 16, 16)
plot(mesh)
# Plot a scalar function
u = Function("poisson.xml")
plot(u)
# Plot a vector function as a displacement field
d = Function("elasticity.xml")
plot(d, mode="displacement")
# Save as png
p = plot(mesh)
p.write_png("mesh.png")
# Save as VTK
p = plot(u)
p.write_vtk("poisson.vtk")
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