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julia_help.html
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julia_help.html
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<title>Get help for a julia function. — julia_help • JuliaCall</title>
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<h1>Get help for a julia function.</h1>
<small class="dont-index">Source: <a href='https://github.com/Non-Contradiction/JuliaCall/blob/master/R/interface.R'><code>R/interface.R</code></a></small>
<div class="hidden name"><code>julia_help.Rd</code></div>
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<div class="ref-description">
<p><code>julia_help</code> outputs the documentation of a julia function.</p>
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<pre class="usage"><span class='fu'>julia_help</span>(<span class='no'>fname</span>)</pre>
<h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
<table class="ref-arguments">
<colgroup><col class="name" /><col class="desc" /></colgroup>
<tr>
<th>fname</th>
<td><p>the name of julia function you want to get help with.</p></td>
</tr>
</table>
<h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
<pre class="examples"><div class='input'>
</div><div class='input'> <span class='co'>## julia_setup is quite time consuming</span>
<span class='fu'>julia_help</span>(<span class='st'>"sqrt"</span>)</div><div class='output co'>#> ```
#> sqrt(x)
#> ```
#>
#> Return $\sqrt{x}$. Throws [`DomainError`](@ref) for negative [`Real`](@ref) arguments. Use complex negative arguments instead. The prefix operator `√` is equivalent to `sqrt`.
#>
#> # Examples
#>
#> ```jldoctest; filter = r"Stacktrace:(\n \[[0-9]+\].*)*"
#> julia> sqrt(big(81))
#> 9.0
#>
#> julia> sqrt(big(-81))
#> ERROR: DomainError with -8.1e+01:
#> NaN result for non-NaN input.
#> Stacktrace:
#> [1] sqrt(::BigFloat) at ./mpfr.jl:501
#> [...]
#>
#> julia> sqrt(big(complex(-81)))
#> 0.0 + 9.0im
#> ```
#>
#> ```
#> sqrt(A::AbstractMatrix)
#> ```
#>
#> If `A` has no negative real eigenvalues, compute the principal matrix square root of `A`, that is the unique matrix $X$ with eigenvalues having positive real part such that $X^2 = A$. Otherwise, a nonprincipal square root is returned.
#>
#> If `A` is symmetric or Hermitian, its eigendecomposition ([`eigen`](@ref)) is used to compute the square root. Otherwise, the square root is determined by means of the Björck-Hammarling method [^BH83], which computes the complex Schur form ([`schur`](@ref)) and then the complex square root of the triangular factor.
#>
#> [^BH83]: Åke Björck and Sven Hammarling, "A Schur method for the square root of a matrix", Linear Algebra and its Applications, 52-53, 1983, 127-140. [doi:10.1016/0024-3795(83)80010-X](https://doi.org/10.1016/0024-3795(83)80010-X)
#>
#> # Examples
#>
#> ```jldoctest
#> julia> A = [4 0; 0 4]
#> 2×2 Array{Int64,2}:
#> 4 0
#> 0 4
#>
#> julia> sqrt(A)
#> 2×2 Array{Float64,2}:
#> 2.0 0.0
#> 0.0 2.0
#> ```</div><div class='input'>
</div></pre>
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<h2>Contents</h2>
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<li><a href="#arguments">Arguments</a></li>
<li><a href="#examples">Examples</a></li>
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