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UNIX for Advanced & Expert Users
Conversion from ASCII to binary for physical simulation code in C/C++
Post 302507413 by Cybertib on Wednesday 23rd of March 2011 07:17:25 PM
03-23-2011
Ok then, that was a dummy question, and not an expert one...
Thank you for everything!
---------- Post updated at 12:17 AM ---------- Previous update was at 12:14 AM ----------
What about converting the old files into binary ?
"od" command seems good, but after several tests, conversion don't compress the data as expected. You gzip idea is interesting to not reach quotas, but the data need to be extracted before being treated with gnuplot in an ascii form. Using binary might much more fast, following the gnuplot documentation.
Idea?
Thank you again
Thibault
Thank you for everything!
---------- Post updated at 12:17 AM ---------- Previous update was at 12:14 AM ----------
Quote:
No, they're completely different... The variables in a C program start as binary, and one of sprintf's jobs is to convert binary into ASCII. You're converting binary numbers into an ASCII string then writing the ASCII string to file.
My example doesn't convert -- it writes the variable direct, as binary. You could read them in as ASCII with with fgets and sscanf, then just write them back out raw as binary.
My example doesn't convert -- it writes the variable direct, as binary. You could read them in as ASCII with with fgets and sscanf, then just write them back out raw as binary.
"od" command seems good, but after several tests, conversion don't compress the data as expected. You gzip idea is interesting to not reach quotas, but the data need to be extracted before being treated with gnuplot in an ascii form. Using binary might much more fast, following the gnuplot documentation.
Idea?
Thank you again
Thibault
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LEARN ABOUT OSF1
xgas
xgas(1X) xgas(1X) NAME
xgas - animated simulation of an ideal gas SYNOPSIS
xgas [-option...] OPTIONS
This is a toolkit program; all the usual toolkit options are available. Sets the autoStart resource. Sets the timeStepSize resource. Sets the delay resource. Sets the randomBounce resource. Sets the equilibrium resource. Sets the maxMolecules resource. Sets the fore- ground. Sets the background. DESCRIPTION
xgas is a physical simulation of an ideal gas in a heated box. Gas molecules move around the box with velocities dependent on their temper- ature. A chamber consisting of two boxes contains the gas molecules; the temperature of each box can be independently controlled by a scrollbar. When gas molecules collide with the walls, their temperature approaches that of the box. Use mouse button 1 to create molecules one at a time at the cursor position. Use mouse button 2 to create the maximum number of molecules at the cursor position. RESOURCES
The xgas program uses the following X resources: Starts the simulation automatically. Good for canned demos. Specifies the simulated time duration in microseconds for each cycle of computation. Specifies the real time interval between timestep computations. In each wall col- lision, a molecule bounces elastically (angle of incidence = angle of reflection). A component of randomness is added to this angle. Ran- domBounce varies from 0.0 (no randomness) to 1.0 (completely random angle of incidence). During each wall collision, a molecule's kinetic energy approaches that corresponding to the temperature of the wall. If equilibrium is 1.0, the molecule reaches the wall temperature imme- diately. For values between 1.0 and 0.0, the molecule approaches the temperature of the wall more slowly. Specifies the maximum number of molecules in the simulation. BUGS
When the chamber is resized, molecules should be rearranged appropriately. Instead, the molecule arrays are reinitialized. SEE ALSO
X(1X), xwd(1X) AUTHOR
Larry Medwin xgas(1X)