N-Dimensional Lists (ndlist)

Vectors, matrices, and arbitrary dimensional tensors (ND-lists) in pure Tcl.

Uses the same format for matrices/arbitrary rank tensors as VecTcl, but ND-lists are not limited to numeric values.

Installation

This package is a Tin package. Tin makes installing Tcl packages easy, and is available here.

After installing Tin, simply run the following Tcl code to install and import the commands from the most recent version of "ndlist":

package require tin 2.1
tin autoadd ndlist https://github.com/ambaker1/ndlist install.tcl
tin import ndlist

Examples

Here are just a few of the things you can do with "ndlist":

# Difference between elements in a vector
set x {1 2 4 7 11 16}
puts [nexpr {@x(1:-1) - @x(0:-2)}]; # 1 2 3 4 5

# Swapping matrix rows
set a {{1 2 3} {4 5 6} {7 8 9}}
nset a {1 0} : [nget $a {0 1} :]
puts $a; # {4 5 6} {1 2 3} {7 8 9}

# Changing tensor axes
set x {{{1 2} {3 4}} {{5 6} {7 8}}}
set y [nswapaxes $x 0 2]
set z [nmoveaxis $x 0 2]
puts [lindex $x 0 0 1]; # 2
puts [lindex $y 1 0 0]; # 2
puts [lindex $z 0 1 0]; # 2

Documentation

Full documentation with examples here.