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‎en/README.md‎

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![banner](banner_homepage.png)
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### Nelson 0.5.11.0
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### Nelson 0.5.12.0
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This is an pre-release of Nelson.
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‎en/SUMMARY.md‎

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* [fliplr](./elementary_functions/fliplr.md)
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* [flipud](./elementary_functions/flipud.md)
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* [floor](./elementary_functions/floor.md)
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* [hankel](./elementary_functions/hankel.md)
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* [hex2dec](./elementary_functions/hex2dec.md)
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* [hilb](./elementary_functions/hilb.md)
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* [imag](./elementary_functions/imag.md)
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* [ind2sub](./elementary_functions/ind2sub.md)
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* [invhilb](./elementary_functions/invhilb.md)
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* [isapprox](./elementary_functions/isapprox.md)
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* [iscolumn](./elementary_functions/iscolumn.md)
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* [istriu](./elementary_functions/isdiag.md)
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* [isequal](./elementary_functions/isequal.md)
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* [isequaln](./elementary_functions/isequaln.md)
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* [isinf](./elementary_functions/isinf.md)
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* [ismatrix](./elementary_functions/ismatrix.md)
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* [isnan](./elementary_functions/isnan.md)
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* [isrow](./elementary_functions/isrow.md)
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* [istril](./elementary_functions/istril.md)
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* [istriu](./elementary_functions/istriu.md)
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* [isvector](./elementary_functions/isvector.md)
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* [special_functions](./special_functions/README.md)
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* [betainc](./special_functions/betainc.md)
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* [factor](./special_functions/factor.md)
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* [gamma](./special_functions/gamma.md)
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* [gcd](./special_functions/gcd.md)
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* [primes](./special_functions/primes.md)
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* [constructors_functions](./constructors_functions/README.md)

‎en/changelogs/CHANGELOG.md‎

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# 0.5.12 (2021-12-31)
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## Added
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- `hankel` function: Hankel matrix.
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- `factor` function: Prime factors.
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- `primes` function: Prime numbers less than or equal to input value.
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- `isrow` function: Determine whether input is row vector.
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- `iscolumn` function: Determine whether input is column vector.
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## Fixed
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- [#544](http://github.com/Nelson-numerical-software/nelson/issues/544): add `folder` fieldname to `dir` output.
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- [#541](http://github.com/Nelson-numerical-software/nelson/issues/541): common class between two elements for operators, horzcat and vertcat.
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## Compilation
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- Boost 1.78 support (default on Windows).
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- CMake 3.22.1 (on Windows).
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# 0.5.11 (2021-11-26)
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## Added

‎en/elementary_functions/README.md‎

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* [fliplr](fliplr.md) - Flip order of elements left to right
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* [flipud](flipud.md) - Flip order of elements up to dow
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* [floor](floor.md) - Round down
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* [hankel](hankel.md) - Hankel matrix
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* [hex2dec](hex2dec.md) - Convert number in base 16 to decimal.
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* [hilb](hilb.md) - Hilbert matrix
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* [imag](imag.md) - Imaginary part of an complex number.
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* [ind2sub](ind2sub.md) - Linear index to matrix subscript values
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* [invhilb](invhilb.md) - Inverse of Hilbert matrix
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* [isapprox](isapprox.md) - Return true if arguments are approximately equal, within the precision.
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* [iscolumn](iscolumn.md) - Determine whether input is column vector.
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* [istriu](isdiag.md) - Checks if matrix is diagonal.
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* [isequal](isequal.md) - Return true if all arguments x1, x2, ... , xn are equal (same dimensions, same values).
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* [isequaln](isequaln.md) - Return true if all arguments x1, x2, ... , xn are equal (same dimensions, same values or NaNs).
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* [isinf](isinf.md) - Check for Infinity entries.
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* [ismatrix](ismatrix.md) - determines whether input is matrix or not
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* [isnan](isnan.md) - Check for Not a Number entries.
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* [isrow](isrow.md) - Determine whether input is row vector.
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* [istril](istril.md) - Checks if matrix is lower triangular.
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* [istriu](istriu.md) - Checks if matrix is upper triangular.
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* [isvector](isvector.md) - Checks input is vector.

‎en/elementary_functions/SUMMARY.md‎

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* [fliplr](fliplr.md)
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* [flipud](flipud.md)
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* [floor](floor.md)
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* [hankel](hankel.md)
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* [hex2dec](hex2dec.md)
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* [hilb](hilb.md)
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* [imag](imag.md)
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* [ind2sub](ind2sub.md)
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* [invhilb](invhilb.md)
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* [isapprox](isapprox.md)
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* [iscolumn](iscolumn.md)
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* [istriu](isdiag.md)
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* [isequal](isequal.md)
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* [isequaln](isequaln.md)
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* [isinf](isinf.md)
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* [ismatrix](ismatrix.md)
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* [isnan](isnan.md)
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* [isrow](isrow.md)
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* [istril](istril.md)
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* [istriu](istriu.md)
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* [isvector](isvector.md)

‎en/elementary_functions/hankel.md‎

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# hankel
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Hankel matrix
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## Syntax
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- H = hankel(c)
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- H = hankel(c, r)
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## Input argument
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- c - First column of Hankel matrix: vector or scalar.
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- r - Last row of Hankel matrix: vector or scalar.
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## Output argument
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- H - Hankel Matrix.
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## Description
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<p><b>H = hankel(c)</b> returns a square Hankel Matrix with <b>c</b> the first column of the matrix and the elements are zero below the main anti-diagonal.</p>
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<p><b>H = hankel(c, r)</b> returns a Hankel matrix with <b>c</b> as its first column and <b>r</b> as its last row.</p>
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<p>If last element of <b>c</b> differs from the first element of <b>r</b>, then Hankel issues a warning and uses the last element of <b>c</b> for the anti-diagonal.</p>
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## Example
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```matlab
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c = [1 2 3 4 5];
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hankel(c)
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```
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## See also
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[hilb](hilb.md).
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## History
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|Version|Description|
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|------|------|
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|1.0.0|initial version|
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## Author
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Allan CORNET
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‎en/elementary_functions/iscolumn.md‎

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# iscolumn
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Determine whether input is column vector.
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## Syntax
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- tf = iscolumn(V)
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## Input argument
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- V - a variable
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## Output argument
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- tf - logical: result of 'iscolumn'.
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## Description
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<p><b>iscolumn(V)</b> returns logical <b>true</b> if size(V) returns [n, 1] with a nonnegative integer value n, and logical <b>false</b> otherwise.</p>
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## Example
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```matlab
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iscolumn([1:4])
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iscolumn([1:4]')
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```
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## See also
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[isrow](isrow.md).
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## History
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|Version|Description|
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|------|------|
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|1.0.0|initial version|
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## Author
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Allan CORNET
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‎en/elementary_functions/isrow.md‎

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# isrow
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Determine whether input is row vector.
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## Syntax
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- tf = isrow(V)
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## Input argument
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- V - a variable
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## Output argument
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- tf - logical: result of 'isrow'.
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## Description
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<p><b>isrow(V)</b> returns logical <b>true</b> if size(V) returns [1, n] with a nonnegative integer value n, and logical <b>false</b> otherwise.</p>
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## Example
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```matlab
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isrow([1:4])
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isrow([1:4]')
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```
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## See also
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[iscolumn](iscolumn.md).
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## History
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|Version|Description|
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|------|------|
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|1.0.0|initial version|
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## Author
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Allan CORNET
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‎en/special_functions/README.md‎

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* [betainc](betainc.md) - Incomplete beta function
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* [factor](factor.md) - Prime factors
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* [gamma](gamma.md) - Gamma special function
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* [gcd](gcd.md) - Greatest common divisor
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* [primes](primes.md) - Prime numbers less than or equal to input value
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‎en/special_functions/SUMMARY.md‎

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* [special_functions](README.md)
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* [betainc](betainc.md)
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* [factor](factor.md)
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* [gamma](gamma.md)
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* [gcd](gcd.md)
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* [primes](primes.md)
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