| 1 | # ---------------------------------------------------------------------- |
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| 2 | # EXAMPLE: Fermi-Dirac function in R. |
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| 3 | # |
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| 4 | # This simple example shows how to use Rappture within a simulator |
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| 5 | # written in R. |
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| 6 | # ====================================================================== |
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| 7 | # AUTHOR: Derrick Kearney, Purdue University |
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| 8 | # Copyright (c) 2004-2012 HUBzero Foundation, LLC |
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| 9 | # |
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| 10 | # See the file "license.terms" for information on usage and |
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| 11 | # redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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| 12 | # ====================================================================== |
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| 13 | |
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| 14 | require(Rappture) |
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| 15 | |
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| 16 | # save the command line arguments |
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| 17 | args <- commandArgs(); |
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| 18 | |
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| 19 | # pick out the driver file which is the 7th element in the array |
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| 20 | # our array looks like this: |
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| 21 | # [1] "/usr/lib/R/bin/exec/R" |
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| 22 | # [2] "--slave" |
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| 23 | # [3] "--no-save" |
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| 24 | # [4] "--no-restore" |
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| 25 | # [5] "--silent" |
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| 26 | # [6] "--args" |
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| 27 | # [7] "driver.xml" |
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| 28 | |
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| 29 | # open the XML file containing the run parameters |
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| 30 | driver <- rp_lib(args[7]) |
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| 31 | |
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| 32 | rp_utils_progress(10,"reading inputs") |
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| 33 | |
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| 34 | T <- rp_lib_get_string(driver,"input.number(temperature).current") |
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| 35 | T <- rp_units_convert_double(T,"K") |
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| 36 | Ef <- rp_lib_get_string(driver,"input.number(Ef).current") |
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| 37 | Ef <- rp_units_convert_double(Ef,"eV") |
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| 38 | |
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| 39 | rp_utils_progress(30,"performing calculations") |
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| 40 | |
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| 41 | kT <- 8.61734e-5 * T |
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| 42 | Emin <- Ef - 10*kT |
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| 43 | Emax <- Ef + 10*kT |
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| 44 | |
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| 45 | dE <- 0.005*(Emax-Emin) |
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| 46 | |
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| 47 | rp_utils_progress(60,"performing calculations") |
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| 48 | |
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| 49 | y <- seq(Emin,Emax,by=dE) |
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| 50 | x <- sapply(y,function(E) 1.0/(1.0 + exp((E - Ef)/kT))) |
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| 51 | |
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| 52 | rp_utils_progress(80,"storing results") |
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| 53 | |
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| 54 | # Label output graph with title, x-axis label, |
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| 55 | # y-axis lable, and y-axis units |
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| 56 | rp_lib_put_string(driver,"output.curve(f12).about.label","Fermi-Dirac Factor",FALSE) |
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| 57 | rp_lib_put_string(driver,"output.curve(f12).xaxis.label","Fermi-Dirac Factor",FALSE) |
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| 58 | rp_lib_put_string(driver,"output.curve(f12).yaxis.label","Energy",FALSE) |
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| 59 | rp_lib_put_string(driver,"output.curve(f12).yaxis.units","eV",FALSE) |
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| 60 | |
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| 61 | rp_utils_progress(90,"storing results") |
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| 62 | |
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| 63 | # coerce our arrays into a string of the form: |
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| 64 | # "x1 y1 \n x2 y2 \n x3 y3\n"... |
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| 65 | # store the string in the Rappture library object |
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| 66 | s <- paste(sprintf("%g %g\n",x,y),collapse="") |
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| 67 | rp_lib_put_string(driver,"output.curve(f12).component.xy",s,FALSE) |
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| 68 | |
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| 69 | |
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| 70 | rp_utils_progress(100,"preparing graphs") |
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| 71 | |
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| 72 | # save the updated XML describing the run... |
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| 73 | rp_lib_result(driver) |
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