# Unthreshold recurrence plot. How to get a smooth color change?

**URL:** <https://discourse.julialang.org/t/unthreshold-recurrence-plot-how-to-get-a-smooth-color-change/23452>\
**Category:** New to Julia\
**Tags:** plotting\
**Created:** [April 23, 2019, 8:00pm UTC](https://discourse.julialang.org/t/unthreshold-recurrence-plot-how-to-get-a-smooth-color-change/23452 "2019-04-23T20:00:54Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![SSkor](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/sskor/32/7623_2.png) [@SSkor](https://discourse.julialang.org/u/SSkor)\
**Post date:** [April 23, 2019, 8:00pm UTC](https://discourse.julialang.org/t/unthreshold-recurrence-plot-how-to-get-a-smooth-color-change/23452/1 "2019-04-23T20:00:54Z")

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![image](https://global.discourse-cdn.com/julialang/original/3X/b/e/be11de4b4da7bf2fc88351f0393f32deb3a96ffe.png)  
This Recurrence Plot (RP) I get by

```julia
using Plots
gr()
Plots.contour(1:n, 1:n, R, fill=true, size = (600,600))

```

But I feet that I lose some structure of RP in the black area. How to get a smooth color change?  
Thank you!

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<div class="post-metadata">

**Author:** ![SSkor](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/sskor/32/7623_2.png) [@SSkor](https://discourse.julialang.org/u/SSkor)\
**Post date:** [April 23, 2019, 8:38pm UTC](https://discourse.julialang.org/t/unthreshold-recurrence-plot-how-to-get-a-smooth-color-change/23452/2 "2019-04-23T20:38:33Z")

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I’ve found a solution!

![image](https://global.discourse-cdn.com/julialang/original/3X/f/a/fa05d76695f20f1ab2ebcfda452f3d257db2d68e.png)

```julia
using PyPlot
figure(figsize=(5,5))
PyPlot.imshow(R, extent=[0, 5, 0, 5], origin="lower", cmap="RdGy")
PyPlot.colorbar()
PyPlot.axis(aspect="image")
gcf()

```

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**Author:** ![heliosdrm](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/heliosdrm/32/3851_2.png) [@heliosdrm](https://discourse.julialang.org/u/heliosdrm)\
**Post date:** [April 23, 2019, 8:44pm UTC](https://discourse.julialang.org/t/unthreshold-recurrence-plot-how-to-get-a-smooth-color-change/23452/3 "2019-04-23T20:44:34Z")

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Nice plot. Good job!

As a side note, if you are interested in RQA (not that much on the side of plots, but on the numerical aspects), you may also be willing to have a look at [RecurrenceAnalysis.jl](https://github.com/JuliaDynamics/RecurrenceAnalysis.jl).

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<div class="post-metadata">

**Author:** ![SSkor](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/sskor/32/7623_2.png) [@SSkor](https://discourse.julialang.org/u/SSkor)\
**Post date:** [April 23, 2019, 9:03pm UTC](https://discourse.julialang.org/t/unthreshold-recurrence-plot-how-to-get-a-smooth-color-change/23452/4 "2019-04-23T21:03:41Z")

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Thank you a lot! I try to apply RQA to distinguish financial bubble’s crash phase. I don’t know someone who is interested in this area at my university. So I really often look into RecurrenceAnalysis.jl documentation. This package is the best tool for my purpose!