# Loess -- Gadfly -- SVG/PDF "False" Error

**URL:** <https://discourse.julialang.org/t/loess-gadfly-svg-pdf-false-error/9151>\
**Category:** Visualization\
**Created:** [February 18, 2018, 11:46pm UTC](https://discourse.julialang.org/t/loess-gadfly-svg-pdf-false-error/9151 "2018-02-18T23:46:29Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![ivo\_welch](https://avatars.discourse-cdn.com/v4/letter/i/d2c977/32.png) [@ivo\_welch](https://discourse.julialang.org/u/ivo_welch)\
**Post date:** [February 18, 2018, 11:46pm UTC](https://discourse.julialang.org/t/loess-gadfly-svg-pdf-false-error/9151/1 "2018-02-18T23:46:29Z")

</div>

Dear Julia Experts— on macOS, julia 0.6.2, Feb 2018:

```julia
using Loess
xs = 10 .* rand(100);
ys = sin(xs) .+ 0.5 * rand(100);
model = loess(xs, ys);
us = collect(minimum(xs):0.1:maximum(xs))
vs = predict(model, us)

using Gadfly
p = plot(x=xs, y=ys, Geom.point, Guide.xlabel("x"), Guide.ylabel("y"),
         layer(Geom.line, x=us, y=vs))
draw(SVG("loess.svg", 6inch, 3inch), p)

```

spawns and draws a nice figure in the web browser, but the SVG draw just returns “false” without error detail.

I then installed `Cairo` and `Fontconfig`, and `rm ~/.julia/lib/v0.6/Compose.ji`, and restarted the REPL, then the equivalent pdf() creation worked

```julia
draw(PDF("loess.pdf", 6inch, 3inch), p)

```

My suggestion is this: [a] could the SVG draw error be more explanatory; [b] could the loess docs be updated for it?