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Restrict output height of PCA model representation #195

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Restrict output height of PCA model representation #195

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4 changes: 4 additions & 0 deletions docs/src/pca.md
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Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,10 @@ pcacov
pcasvd
```

**Note:** By default, the model displayed with additional statistics (e.g. loadings, variance, etc.).
Depending on a screens size this output may be limited. Use `show(stdout, "text/plain", M)` to produce
a full model output.

## Kernel Principal Component Analysis

[Kernel Principal Component Analysis](https://en.wikipedia.org/wiki/Kernel_principal_component_analysis>) (kernel PCA)
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10 changes: 10 additions & 0 deletions src/pca.jl
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Expand Up @@ -143,8 +143,16 @@ function show(io::IO, M::PCA)
end

function show(io::IO, ::MIME"text/plain", M::PCA)
screenheight = if !(get(io, :limit, false)::Bool)
typemax(Int)
else
displaysize(io)[1]-4
end

idim, odim = size(M)
print(io, "PCA(indim = $idim, outdim = $odim, principalratio = $(r2(M)))")
screenheight > idim+4 || return

ldgs = loadings(M)
rot = diag(ldgs' * ldgs)
ldgs = ldgs[:, sortperm(rot, rev=true)]
Expand All @@ -154,6 +162,8 @@ function show(io::IO, ::MIME"text/plain", M::PCA)
print(io, "\n\nPattern matrix (unstandardized loadings):\n")
cft = CoefTable(ldgs, string.("PC", 1:odim), string.("", 1:idim))
print(io, cft)
screenheight > idim+15 || return

print(io, "\n\n")
print(io, "Importance of components:\n")
λ = eigvals(M)
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