O2scl contains a command-line utility, acol
, designed to facilitate the manipulation of two-dimensional data tables, either stored in a generic text-file, or o2scl::table objects stored using the I/O facilities in O2scl .
acol
has a command, run
, which allows you to run a set of commands which are given in a separate file. An example script in the extras
directory of the documentation is named acol.scr
. The associated output is a useful demonstration of the capabilities of acol
.
# # ----------------------------------------------------------------- # This file documents the use of the 'acol' command. The command # 'help' provides the full help text. You can also get help on the # commands individually, e.g. # ----------------------------------------------------------------- > help create Usage: create <name> <low> <hi> <step> Create a table from uniform grid. Create a new table with one column whose entries are an evenly-spaced grid. This takes four arguments, the name of the column, the first value, the increment between successive values and the maximum possible value. Note that finite precision arithmetic may cause small deviations from the expected result. If a table is currently in memory, it is deallocated beforehand. # ----------------------------------------------------------------- # The full command list is given with 'commands' # ----------------------------------------------------------------- > commands Command list: alias delete-rows get internal quit slice assign deriv get-conv interp read sort calc deriv2 get-row license rename stats cat exit get-unit list run sum commands filelist help max select to-hist contours find-row index min select-rows type convert-unit fit insert nlines set version create function insert-full no-intro set-data warranty create3 gen3-list integ output set-unit delete-col generic interactive preview show-units # ----------------------------------------------------------------- # Use 'create' to create a table with one column # ----------------------------------------------------------------- > create x 0 1 0.1 # ----------------------------------------------------------------- # Use 'function' to apply a function to create a new column # ----------------------------------------------------------------- > function sin(x) s > function sqrt(1-s*s) c # ----------------------------------------------------------------- # The 'deriv' command computes derivatives # ----------------------------------------------------------------- > deriv x s c2 # ----------------------------------------------------------------- # Use 'output' to see the results # ----------------------------------------------------------------- > output x s c c2 0.000000e+00 0.000000e+00 1.000000e+00 9.999995e-01 1.000000e-01 9.983342e-02 9.950042e-01 9.950034e-01 2.000000e-01 1.986693e-01 9.800666e-01 9.800667e-01 3.000000e-01 2.955202e-01 9.553365e-01 9.553335e-01 4.000000e-01 3.894183e-01 9.210610e-01 9.210695e-01 5.000000e-01 4.794255e-01 8.775826e-01 8.775485e-01 6.000000e-01 5.646425e-01 8.253356e-01 8.254605e-01 7.000000e-01 6.442177e-01 7.648422e-01 7.643741e-01 8.000000e-01 7.173561e-01 6.967067e-01 6.984518e-01 9.000000e-01 7.833269e-01 6.216100e-01 6.150954e-01 1.000000e+00 8.414710e-01 5.403023e-01 5.646134e-01 # ----------------------------------------------------------------- # Or give 'output' command an argument to output to a file # ----------------------------------------------------------------- > output test.txt # ----------------------------------------------------------------- # Change the output precision using set # ----------------------------------------------------------------- > set precision 4 > output x s c c2 0.0000e+00 0.0000e+00 1.0000e+00 1.0000e+00 1.0000e-01 9.9833e-02 9.9500e-01 9.9500e-01 2.0000e-01 1.9867e-01 9.8007e-01 9.8007e-01 3.0000e-01 2.9552e-01 9.5534e-01 9.5533e-01 4.0000e-01 3.8942e-01 9.2106e-01 9.2107e-01 5.0000e-01 4.7943e-01 8.7758e-01 8.7755e-01 6.0000e-01 5.6464e-01 8.2534e-01 8.2546e-01 7.0000e-01 6.4422e-01 7.6484e-01 7.6437e-01 8.0000e-01 7.1736e-01 6.9671e-01 6.9845e-01 9.0000e-01 7.8333e-01 6.2161e-01 6.1510e-01 1.0000e+00 8.4147e-01 5.4030e-01 5.6461e-01 > set precision 6 # ----------------------------------------------------------------- # Shell commands are proceeded by an '!' # ----------------------------------------------------------------- > !cat test.txt acol: Executing system command: cat test.txt x s c c2 0.000000e+00 0.000000e+00 1.000000e+00 9.999995e-01 1.000000e-01 9.983342e-02 9.950042e-01 9.950034e-01 2.000000e-01 1.986693e-01 9.800666e-01 9.800667e-01 3.000000e-01 2.955202e-01 9.553365e-01 9.553335e-01 4.000000e-01 3.894183e-01 9.210610e-01 9.210695e-01 5.000000e-01 4.794255e-01 8.775826e-01 8.775485e-01 6.000000e-01 5.646425e-01 8.253356e-01 8.254605e-01 7.000000e-01 6.442177e-01 7.648422e-01 7.643741e-01 8.000000e-01 7.173561e-01 6.967067e-01 6.984518e-01 9.000000e-01 7.833269e-01 6.216100e-01 6.150954e-01 1.000000e+00 8.414710e-01 5.403023e-01 5.646134e-01 acol: Done with system command (returned 0). # ----------------------------------------------------------------- # Or store the results in the internal format # ----------------------------------------------------------------- > internal test.o2 # ----------------------------------------------------------------- # Generic test files can be read using the 'generic' command # ----------------------------------------------------------------- > generic test.txt > output x s c c2 0.000000e+00 0.000000e+00 1.000000e+00 9.999995e-01 1.000000e-01 9.983342e-02 9.950042e-01 9.950034e-01 2.000000e-01 1.986693e-01 9.800666e-01 9.800667e-01 3.000000e-01 2.955202e-01 9.553365e-01 9.553335e-01 4.000000e-01 3.894183e-01 9.210610e-01 9.210695e-01 5.000000e-01 4.794255e-01 8.775826e-01 8.775485e-01 6.000000e-01 5.646425e-01 8.253356e-01 8.254605e-01 7.000000e-01 6.442177e-01 7.648422e-01 7.643741e-01 8.000000e-01 7.173561e-01 6.967067e-01 6.984518e-01 9.000000e-01 7.833269e-01 6.216100e-01 6.150954e-01 1.000000e+00 8.414710e-01 5.403023e-01 5.646134e-01 # ----------------------------------------------------------------- # Files in the internal format can be read with 'read' # ----------------------------------------------------------------- > read test.o2 No name specified, reading first table object. > output x s c c2 0.000000e+00 0.000000e+00 1.000000e+00 9.999995e-01 1.000000e-01 9.983342e-02 9.950042e-01 9.950034e-01 2.000000e-01 1.986693e-01 9.800666e-01 9.800667e-01 3.000000e-01 2.955202e-01 9.553365e-01 9.553335e-01 4.000000e-01 3.894183e-01 9.210610e-01 9.210695e-01 5.000000e-01 4.794255e-01 8.775826e-01 8.775485e-01 6.000000e-01 5.646425e-01 8.253356e-01 8.254605e-01 7.000000e-01 6.442177e-01 7.648422e-01 7.643741e-01 8.000000e-01 7.173561e-01 6.967067e-01 6.984518e-01 9.000000e-01 7.833269e-01 6.216100e-01 6.150954e-01 1.000000e+00 8.414710e-01 5.403023e-01 5.646134e-01 # ----------------------------------------------------------------- # Tables also contain constant values in addition to data # ----------------------------------------------------------------- > assign pi acos(-1.0) # ----------------------------------------------------------------- # The 'list' command lists the column and constant names # ----------------------------------------------------------------- > list Table name: acol 1 constant: pi 3.141593e+00 4 columns: 0. x 1. s 2. c 3. c2 11 lines of data. # ----------------------------------------------------------------- # Constants can be used in expressions # ----------------------------------------------------------------- > function x*pi/2 x2 # ----------------------------------------------------------------- # Columns can be renamed. Legal column names contain letters # numbers and underscores, and begin with a letter. # ----------------------------------------------------------------- > rename x2 x_2 > output x s c c2 x_2 [] [] [] [] [] 0.000000e+00 0.000000e+00 1.000000e+00 9.999995e-01 0.000000e+00 1.000000e-01 9.983342e-02 9.950042e-01 9.950034e-01 1.570796e-01 2.000000e-01 1.986693e-01 9.800666e-01 9.800667e-01 3.141593e-01 3.000000e-01 2.955202e-01 9.553365e-01 9.553335e-01 4.712389e-01 4.000000e-01 3.894183e-01 9.210610e-01 9.210695e-01 6.283185e-01 5.000000e-01 4.794255e-01 8.775826e-01 8.775485e-01 7.853982e-01 6.000000e-01 5.646425e-01 8.253356e-01 8.254605e-01 9.424778e-01 7.000000e-01 6.442177e-01 7.648422e-01 7.643741e-01 1.099557e+00 8.000000e-01 7.173561e-01 6.967067e-01 6.984518e-01 1.256637e+00 9.000000e-01 7.833269e-01 6.216100e-01 6.150954e-01 1.413717e+00 1.000000e+00 8.414710e-01 5.403023e-01 5.646134e-01 1.570796e+00 # ----------------------------------------------------------------- # (Remove test files created earlier.) # ----------------------------------------------------------------- > !rm test.txt acol: Executing system command: rm test.txt acol: Done with system command (returned 0). > !rm test.o2 acol: Executing system command: rm test.o2 acol: Done with system command (returned 0).
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