untensor

untensor is more or less the inverse of to.tensor. It flattens
 tensorial dimensions. However the result is still a tensor.

arith

Provides convenience functions for advanced
linear algebra with tensors and computation with data sets of
tensors on a higher level abstraction. It includes Einstein and
Riemann summing conventions, dragging, co- and contravariate
indices, parallel computations on sequences of tensors.

K Gerald van den Boogaart

tensorA

Advanced Tensor Arithmetic with Named Indices

untensor function

<dl> <dt>X</dt>
<dd>the tensor</dd> <dt>i</dt>
<dd>the names of the dimensions to be removed and combined to a
 single new 
 one as a character vector or a named list of character vectors if
 the remove should be done in multiple chunks.
 <code>pos</code> and <code>name</code> is in this case ignored.</dd> <dt>name</dt>
<dd>the name of the new dimension to replace the others</dd> <dt>pos</dt>
<dd>where to insert the the new dimension</dd> <dt>by</dt>
<dd>if i not given the dimensions to be kept</dd></dl>

Arguments

Author

Removes indices/dimensions from a tensor — untensor

<dl>

 <dt>X</dt>
<dd>the tensor</dd>

 <dt>i</dt>
<dd>the names of the dimensions to be removed and combined to a
 single new 
 one as a character vector or a named list of character vectors if
 the remove should be done in multiple chunks.
 <code>pos</code> and <code>name</code> is in this case ignored.</dd>

 <dt>name</dt>
<dd>the name of the new dimension to replace the others</dd>

 <dt>pos</dt>
<dd>where to insert the the new dimension</dd>

 <dt>by</dt>
<dd>if i not given the dimensions to be kept</dd>

</dl>

untensor: Removes indices/dimensions from a tensor

Description

Usage

Value

Arguments

Author

Details

See Also

Examples