The acol Command Line Utility¶
acol contents¶
acol introduction¶
O₂scl contains a command line utility, acol, designed to facilitate the manipulation of various objects stored in HDF5 files. It can handle integers, characters, double-precision floating point numbers, size_t objects, arrays of any of these types, or O₂scl objects of selected types.
acol can only operate with one object at a time. The
basic workflow is:
create an object or read it from an HDF5 file
perform operations on that object
output the object to the screen or write it to an HDF5 file
create or read a new object
…
The available command list can be obtained using help or
commands and changes depending on what type of object is currently
in memory. In order to list the commands which would be available
given a particular type, give commands the type as an argument,
i.e. acol -commands table . In order to get detailed help on how a
command operates on a particular type, give the type and the command
as arguments to help, e.g. acol -help table interp. There are some
commands which are available for all types, and obtaining the help
information for these commands does not require a type argument, i.e.
acol -commands or acol -help read.
acol can sometimes, but not always read and write HDF5 files
generated outside of 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.
acol types¶
The types which can be handled by acol are either C++ standard
types or O₂scl types. The standard types which acol can manipulate are
char, double, double[], int, int[], size_t, size_t[], std::string,
string[], vector<vector<double>> (shortened to
vec_vec_double), and vector<vector<string>> (shortened to
vec_vec_string). The relevant O₂scl types are hist,
hist_2d, prob_dens_mdim_amr, prob_dens_mdim_gaussian, table, table3d, tensor (including double, int, and
size_t versions), tensor_grid
uniform_grid, and vector<contour_line>.
Value specifications¶
Some acol commands take “value specifications” as arguments, which are
string expressions which represent a fixed numerical value. These
specifications are handled by o2scl_hdf::value_spec(). The
first part of the specification is a “type of specification” followed
by a colon, followed by arguments which depend on the type. If no
colon is present, then a “func:” prefix is assumed. The different
types for a value specification are:
1. <numeric value or function> - Value equal to the result of
<function>, e.g. “7.6” or “sin(0.5)”. See Function specifications for a list of functions that can be used.
2. hdf5:<object name>:[addl. spec.] - Read an HDF5 value and obtain
the value from object named <object name>. For some object types,
additional specifications are required to specify which value should
be used. A list of object types and additional specifications and more
detail is given below.
Type |
Additional specification |
Description |
|---|---|---|
double |
(none) |
|
int |
(none) |
|
size_t |
(none) |
|
double[] |
index |
|
int[] |
index |
|
size_t[] |
index |
|
uniform_grid<double> |
index |
|
table |
column name, row index |
3. shell:<shell command> - Set the value equal to the first result
obtained using the specified shell command.
Function specifications¶
Some acol commands can work with mathematical function arguments.
Functions can be created using the operators and functions listed below.
Examples are x==5 && y<1, acos(-1), and sin(x>5).
Comparison operators result in either 1.0 (true) or 0.0 (false).
Operators: () ^ * / % + - == != < > && || << >> >= <=
Functions: exp(x) log(x) log10(x) sin(x) cos(x) tan(x) sqrt(x) abs(x)
asin(x) acos(x) atan(x) sinh(x) cosh(x) tanh(x) asinh(x) acosh(x)
atanh(x) floor(x)
There is also a command called function which works with several
different types to generate data based on functions. Use acol -help
function to get more information on these type-specific commands.
Vector specifications¶
Some acol commands take “value specifications” as arguments, which are
string expressions which represent a list of numerical values. These
specifications are handled by o2scl_hdf::vector_spec().
The different parts of the string are separated by a colon, and the
first part specifes the type of vector specification. The different
types are:
1. val:<value> - Create a vector with one element equal to <value>,
which may be a number or a simple function, e.g. val:sin(0.5).
2. list:<entry 0>,<entry 1>, ..., <entry n-1> - Create a vector with
a simple list of numbers or functions, e.g.
‘list:3.0,1.0e-3,sqrt(2.0)’.
3. func:<N>:<function of i> - Create a vector by specifying the
length of the vector and a function used to fill the elements. For
example: ‘func:41:sin(i/20.0*acos(-1))’.
4. grid:<begin>,<end>,<width>,["log"] - Create a vector equal to a
uniform grid, e.g. use ‘grid:1.0,10.0,1.0’ for a 10-element vector
filled with the numbers 1 to 10.
5. text:<filename>:<column index> - Read a text file and extract a
vector of numbers from a column of the text file (starting with zero
for the first column), ignoring any header rows which contain
non-numeric values. For example ‘text:~/temp.dat:2’ will construct a
vector from the third column of the file ‘temp.dat’ in the user’s home
directory (using wordexp_single_file() which calls the
system wordexp() function to expand the tilde).
6. hdf5:<file name>:<object name>:[addtional spec.] - Read an HDF5
file and obtain a vector from the object with the specified name. The
remaining parts of the string contain additional information which may
be needed depending on the type of object stored in the HDF5 file. A
list of object types and additional specifications and more detail is
given below.
Type |
Additional specification |
Description |
|---|---|---|
double |
(none) |
Implies vector of size 1 |
double[] |
(none) |
|
hist |
(none) |
Vector of histogram weights |
int |
(none) |
Implies vector of size 1 |
int[] |
(none) |
|
size_t |
(none) |
Implies vector of size 1 |
size_t[] |
(none) |
|
table |
<column> |
Selected column from table |
table |
<row> <col pat> |
Selected row and columns |
uniform_grid<double> |
(none) |
For table <row> <col pat>, the first additional specification is a row number, which can be negative to refer to counting from the end of the table. The second additional specification is a pattern of column names using either ‘*’ or ‘?’.
Index specifications¶
The tensor rearrange commands use index specifications to specify how the tensor should be rearranged. Index specifications may be specified as separate arguments e.g. “index(1)” “fixed(2,10)” or multiple index specifications may be given in a single argument separated by spaces or commas, e.g. “index(1) fixed(2,10)” or “index(1),fixed(2,10)”. The indices begin with 0, the first index so that index 1 is the second index. The list of index specification is:
index(ix): Retain index ix in the new tensor.
fixed(ix): Fix the value of index ix.
sum(ix): Sum over the value of index ix
trace(ix1,ix2): Trace (sum) over indices ix and ix2. If the number of entries in either index is smaller than the other, then the remaining entries are ignored in the sum.
reverse(ix): Retain index ix but reverse the order.
range(ix,start,end): Retain index ix but modify range. Ranges include both of their endpoints.
interp(ix,value) (for tensor_grid): fix index ix by interpolating ‘value’ into the grid for index ix.
grid(ix,begin,end,n_bins,log) (for tensor_grid): interpolate the specified index on a grid to create a new index. If the value of log is 1, then the grid is logarithmic.
gridw(ix,begin,end,bin_width,log) (for tensor_grid): interpolate the specified index on a grid with a fixed bin width to create a new index. If the value of log is 1, then the grid is logarithmic and the bin_width is the multiplicative factor between bin edges.
Note that the index specifications which result in a tensor index (all except ‘fixed’, ‘sum’, ‘trace’ and ‘interp’) must be given in the order they should appear in the tensor which results. Also, the ‘rearrange’ commands require that the result of the rearrangement must have at least one index left.
Examples:
index(1),index(0) - take the transpose of a rank 2 tensor (i.e. a matrix)
index(1),fixed(2,0),index(0) - fix the value of index 2 (i.e. the third index) to zero and transpose the other two indicesnn fixed(2,0),index(1),index(0) - same as abovenn”;
String list specifications¶
Some acol commands take “string list specifications” as arguments,
which are string expressions which represent a list of strings. These
specifications are handled by o2scl_hdf::strings_spec().
The different parts of the string are separated by a colon, and the
first part specifes the type of vector specification. The different
types are:
list:<comma-separated list>- A list of strings
2. shell:<command> - The lines obtained from the result of a shell
command, with a maximum of 256 characters per line.
3. pattern:N:x[0][a][A] - The N strings obtained from a pattern.
Occurrences of [0] are replaced with the integer ‘i’ where i runs from
0 to N-1. Occurrences of [a] are replaced with ‘a’ through ‘z’ from 0
through 25, and ‘aa’ through ‘zz’ for i from 26 to 701. Occurrences of
[A] are replaced with ‘A’ through ‘Z’ from 0 through 25, and ‘AA’
through ‘ZZ’ for i from 26 to 701.
hdf5: - Unfinished.
Multiple vector specifications¶
Some acol commands take “multiple vector specifications” as arguments,
which are string expressions which represent a list of vectors (which
need not have the same length). These specifications are handled by
o2scl_hdf::mult_vector_spec(). The different parts of the
string are separated by a colon, and the first part specifes the type
of multiple vector specification. The different types are:
1. func:<N>:<function of i>:<function of i and j> - Specify the
number of vectors, a function of “i” which determines the length of
the ith vector, and a function of “i” and “j” which specifies the jth
element of the ith vector.
2. text:<filename pattern>:<numeric column list> - Read one or
more text files and extract vectors of numbers from columns of the
text file, ignoring any header rows which contain non-numeric values.
For example ‘text:~/temp.dat:2-4’ will construct vectors from the
third, fourth, and fifth columns of the file ‘temp.dat’ in the user’s
home directory.
3. hdf5:<filename pattern>:<object name>:[additional spec.] - Read
one or more HDF5 files and obtain a vector from the object with the
specified name. The remaining parts of the string contain additional
information which may be needed depending on the type of object stored
in the HDF5 file.
Type |
Additional specification |
Description |
|---|---|---|
table |
<column pattern> |
Also, many normal vector specifications (from ‘acol -help vector-spec’) also work as multiple vector specifications. These include specifications which begin with ‘val:’, ‘list:’, ‘grid:’, and ‘table-row:’. Also included are ‘hdf5:’ specifications which refer to objects of type double, double[], hist, int, int[], size_t, size_t[], and uniform_grid<double>.
acol Example¶
#
# -----------------------------------------------------------------
# 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 <type> [...]
Short description: Create an object.
Long description:
Create a new object of type <type>. If an object is currently in memory, it is
deallocated before creating the new object.
create <type> <val>: For types char, int, size_t, and string, create an object
and give it the initial value specified.
create double <value spec.>: Create a double object and set it equal to the
value specified by <value spec.>.
create <type> <size> <function of "i">: For array types int[] and size_t[],
the user must specify the size of the array and a function of the array index
i to fill the array.
create double[] [<size> <function of "i">] or [vector spec.]: For double[] the
user must either give a vector specification, or specify the size of the array
and a function of the array index i.
create table <name> <vector spec.>: Create a new table object with one column
named <name> from a vector specification.
create table-mv <mult. string spec.> <mult. vector spec.>: Create a new table
object with several columns with names taken from the multiple string
specification and data taken from the multiple vector specification.
create tensor <rank> <size 0> <size 1>...: Create a tensor object with the
specified rank and sizes. All tensor entries are initialized to zero.
create tensor_grid <rank> <size 0> <size 1>...: Create a tensor_grid object
with the specified rank and sizes. The tensor grid is initialized to count
each index (beginning with zero) and the entries of the tensor are initialized
to zero. The grid can be specified afterwards using set-grid.
create table3d <x name> <x vector spec.> <y name> <y vector spec.> <slice
name> <slice func.>: Create a new table3d object which has one slice. The x
and y grids are given as vector specifications (see "acol -help vector-spec"
for the syntax). The slice function can be written in terms of the x- and
y-grid values which are referred to by name.
For example, using o2graph from o2sclpy:
o2graph -create table3d x func:100:i/200 y func:100:i/200 z "sin(1/(x+0.01))*
sin(1/(y+0.01))" -den-plot z -xtitle x -ytitle y -show
create vec_vec_double <mult. vector spec.> [mult. vector spec. 2]... : Create
a vec_vec_double object using the given multiple vector specification(s).
See acol -help value-spec for help on value specifications,:acol -help
functions for help on function specifications, and:acol -help mult_vector-spec
for help on multiple vector specifications.
# -----------------------------------------------------------------
# The full command list is given with 'commands'
# -----------------------------------------------------------------
> commands
No current object.
Commands which do not require a current object:
alias convert generic license read version
autocorr create get ninteg run warranty
calc docs h5-copy no-intro set wdocs
clear download help output shell xml-to-o2
commands exit interactive preview slack
constant filelist internal quit type
Use '-commands all' for a list of all commands for the various types.
# -----------------------------------------------------------------
# Use 'create' to create a table with one column
# -----------------------------------------------------------------
> create table x grid: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
Interpolation: 2
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
Interpolation: 1
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
Interpolation: 2
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 text files can be read using the 'generic' command
# -----------------------------------------------------------------
> generic table test.txt
> output
Interpolation: 2
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, found first table object named 'acol'.
> output
Interpolation: 1
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.
# -----------------------------------------------------------------
> rename x2 x_2
> output
1 constant.
pi 3.141593e+00
Interpolation: 1
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).